661 lines
19 KiB
C++
661 lines
19 KiB
C++
#include "cluster_client.h"
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cluster_client_t::cluster_client_t(ring_loop_t *ringloop, timerfd_manager_t *tfd, json11::Json & config)
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{
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this->ringloop = ringloop;
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this->tfd = tfd;
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msgr.osd_num = 0;
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msgr.tfd = tfd;
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msgr.ringloop = ringloop;
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msgr.repeer_pgs = [this](osd_num_t peer_osd)
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{
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if (msgr.osd_peer_fds.find(peer_osd) != msgr.osd_peer_fds.end())
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{
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// peer_osd just connected
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continue_ops();
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}
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else if (unsynced_writes.size())
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{
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// peer_osd just dropped connection
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for (auto op: unsynced_writes)
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{
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for (auto & part: op->parts)
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{
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if (part.osd_num == peer_osd && part.done)
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{
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// repeat this operation
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part.osd_num = 0;
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part.done = false;
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assert(!part.sent);
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op->done_count--;
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}
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}
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if (op->done_count < op->parts.size())
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{
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cur_ops.insert(op);
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}
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}
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continue_ops();
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}
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};
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msgr.exec_op = [this](osd_op_t *op)
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{
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// Garbage in
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printf("Incoming garbage from peer %d\n", op->peer_fd);
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msgr.stop_client(op->peer_fd);
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delete op;
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};
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msgr.use_sync_send_recv = config["use_sync_send_recv"].bool_value() ||
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config["use_sync_send_recv"].uint64_value();
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st_cli.tfd = tfd;
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st_cli.on_load_config_hook = [this](json11::Json::object & cfg) { on_load_config_hook(cfg); };
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st_cli.on_change_osd_state_hook = [this](uint64_t peer_osd) { on_change_osd_state_hook(peer_osd); };
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st_cli.on_change_hook = [this](json11::Json::object & changes) { on_change_hook(changes); };
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st_cli.on_load_pgs_hook = [this](bool success) { on_load_pgs_hook(success); };
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log_level = config["log_level"].int64_value();
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st_cli.parse_config(config);
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st_cli.load_global_config();
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if (ringloop)
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{
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consumer.loop = [this]()
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{
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msgr.read_requests();
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msgr.send_replies();
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this->ringloop->submit();
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};
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ringloop->register_consumer(&consumer);
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}
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}
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cluster_client_t::~cluster_client_t()
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{
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if (ringloop)
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{
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ringloop->unregister_consumer(&consumer);
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}
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}
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void cluster_client_t::continue_ops()
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{
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if (retry_timeout_id)
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{
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tfd->clear_timer(retry_timeout_id);
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retry_timeout_id = 0;
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}
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if (!pg_count)
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{
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// Config is not loaded yet
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return;
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}
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for (auto op_it = cur_ops.begin(); op_it != cur_ops.end(); )
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{
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continue_rw(*op_it++);
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}
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}
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static uint32_t is_power_of_two(uint64_t value)
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{
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uint32_t l = 0;
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while (value > 1)
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{
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if (value & 1)
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{
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return 64;
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}
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value = value >> 1;
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l++;
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}
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return l;
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}
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void cluster_client_t::on_load_config_hook(json11::Json::object & config)
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{
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bs_block_size = config["block_size"].uint64_value();
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bs_disk_alignment = config["disk_alignment"].uint64_value();
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bs_bitmap_granularity = config["bitmap_granularity"].uint64_value();
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if (!bs_block_size)
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{
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bs_block_size = DEFAULT_BLOCK_SIZE;
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}
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if (!bs_disk_alignment)
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{
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bs_disk_alignment = DEFAULT_DISK_ALIGNMENT;
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}
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if (!bs_bitmap_granularity)
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{
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bs_bitmap_granularity = DEFAULT_BITMAP_GRANULARITY;
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}
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uint32_t block_order;
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if ((block_order = is_power_of_two(bs_block_size)) >= 64 || bs_block_size < MIN_BLOCK_SIZE || bs_block_size >= MAX_BLOCK_SIZE)
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{
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throw std::runtime_error("Bad block size");
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}
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if (config.find("pg_stripe_size") != config.end())
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{
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pg_stripe_size = config["pg_stripe_size"].uint64_value();
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}
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if (!pg_stripe_size)
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{
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pg_stripe_size = DEFAULT_PG_STRIPE_SIZE;
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}
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if (config["immediate_commit"] == "all")
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{
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// Cluster-wide immediate_commit mode
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immediate_commit = true;
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}
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else if (config.find("client_dirty_limit") != config.end())
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{
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client_dirty_limit = config["client_dirty_limit"].uint64_value();
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}
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if (!client_dirty_limit)
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{
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client_dirty_limit = DEFAULT_CLIENT_DIRTY_LIMIT;
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}
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msgr.peer_connect_interval = config["peer_connect_interval"].uint64_value();
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if (!msgr.peer_connect_interval)
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{
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msgr.peer_connect_interval = DEFAULT_PEER_CONNECT_INTERVAL;
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}
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msgr.peer_connect_timeout = config["peer_connect_timeout"].uint64_value();
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if (!msgr.peer_connect_timeout)
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{
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msgr.peer_connect_timeout = DEFAULT_PEER_CONNECT_TIMEOUT;
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}
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st_cli.load_pgs();
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}
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void cluster_client_t::on_load_pgs_hook(bool success)
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{
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if (success)
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{
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pg_count = st_cli.pg_config.size();
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if (pg_count)
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{
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for (auto op: offline_ops)
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{
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execute(op);
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}
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offline_ops.clear();
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}
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}
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}
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void cluster_client_t::on_change_hook(json11::Json::object & changes)
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{
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if (pg_count != st_cli.pg_config.size())
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{
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// At this point, all operations should be suspended
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// And they have to be resliced!
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for (auto op: cur_ops)
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{
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op->needs_reslice = true;
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}
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for (auto op: unsynced_writes)
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{
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op->needs_reslice = true;
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}
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pg_count = st_cli.pg_config.size();
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if (pg_count)
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{
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for (auto op: offline_ops)
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{
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execute(op);
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}
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offline_ops.clear();
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}
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}
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continue_ops();
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}
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void cluster_client_t::on_change_osd_state_hook(uint64_t peer_osd)
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{
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if (msgr.wanted_peers.find(peer_osd) != msgr.wanted_peers.end())
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{
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msgr.connect_peer(peer_osd, st_cli.peer_states[peer_osd]);
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}
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}
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/**
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* How writes are synced when immediate_commit is false
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*
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* 1) accept up to <client_dirty_limit> write operations for execution,
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* queue all subsequent writes into <next_writes>
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* 2) accept exactly one SYNC, queue all subsequent SYNCs into <next_writes>, too
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* 3) "continue" all accepted writes
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*
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* "Continue" WRITE:
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* 1) if the operation is not a copy yet - copy it (required for replay)
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* 2) if the operation is not sliced yet - slice it
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* 3) if the operation doesn't require reslice - try to connect & send all remaining parts
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* 4) if any of them fail due to disconnected peers or PGs not up, repeat after reconnecting or small timeout
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* 5) if any of them fail due to other errors, fail the operation and forget it from the current "unsynced batch"
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* 6) if PG count changes before all parts are done, wait for all in-progress parts to finish,
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* throw all results away, reslice and resubmit op
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* 7) when all parts are done, try to "continue" the current SYNC
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* 8) if the operation succeeds, but then some OSDs drop their connections, repeat
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* parts from the current "unsynced batch" previously sent to those OSDs in any order
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*
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* "Continue" current SYNC:
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* 1) take all unsynced operations from the current batch
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* 2) check if all affected OSDs are still alive
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* 3) if yes, send all SYNCs. otherwise, leave current SYNC as is.
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* 4) if any of them fail due to disconnected peers, repeat SYNC after repeating all writes
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* 5) if any of them fail due to other errors, fail the SYNC operation
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*/
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void cluster_client_t::execute(cluster_op_t *op)
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{
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op->retval = 0;
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if (!pg_count)
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{
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// Config is not loaded yet, retry after connecting to etcd
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offline_ops.push_back(op);
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return;
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}
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if (op->opcode != OSD_OP_SYNC && op->opcode != OSD_OP_READ && op->opcode != OSD_OP_WRITE ||
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(op->opcode == OSD_OP_READ || op->opcode == OSD_OP_WRITE) && (!op->inode || !op->len ||
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op->offset % bs_disk_alignment || op->len % bs_disk_alignment))
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{
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op->retval = -EINVAL;
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std::function<void(cluster_op_t*)>(op->callback)(op);
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return;
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}
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if (op->opcode == OSD_OP_SYNC)
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{
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execute_sync(op);
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return;
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}
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if (op->opcode == OSD_OP_WRITE && !immediate_commit)
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{
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if (next_writes.size() > 0)
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{
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next_writes.push_back(op);
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return;
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}
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if (queued_bytes >= client_dirty_limit)
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{
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// Push an extra SYNC operation to flush previous writes
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cluster_op_t *sync_op = new cluster_op_t;
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sync_op->is_internal = true;
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sync_op->opcode = OSD_OP_SYNC;
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sync_op->callback = [](cluster_op_t* sync_op) {};
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execute_sync(sync_op);
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next_writes.push_back(op);
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queued_bytes = 0;
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return;
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}
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queued_bytes += op->len;
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}
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cur_ops.insert(op);
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continue_rw(op);
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}
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void cluster_client_t::continue_rw(cluster_op_t *op)
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{
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if (!pg_count)
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{
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return;
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}
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if (op->opcode == OSD_OP_WRITE && !immediate_commit && !op->is_internal)
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{
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// Save operation for replay when PG goes out of sync
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// (primary OSD drops our connection in this case)
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cluster_op_t *op_copy = new cluster_op_t();
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op_copy->is_internal = true;
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op_copy->orig_op = op;
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op_copy->opcode = op->opcode;
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op_copy->inode = op->inode;
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op_copy->offset = op->offset;
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op_copy->len = op->len;
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op_copy->buf = malloc(op->len);
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op_copy->callback = [](cluster_op_t* op_copy)
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{
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if (op_copy->orig_op)
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{
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// Acknowledge write and forget the original pointer
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op_copy->orig_op->retval = op_copy->retval;
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std::function<void(cluster_op_t*)>(op_copy->orig_op->callback)(op_copy->orig_op);
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op_copy->orig_op = NULL;
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}
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};
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memcpy(op_copy->buf, op->buf, op->len);
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unsynced_writes.push_back(op_copy);
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cur_ops.erase(op);
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cur_ops.insert(op_copy);
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op = op_copy;
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}
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if (!op->parts.size())
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{
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// Slice the operation into parts
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slice_rw(op);
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}
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if (!op->needs_reslice)
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{
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// Send unsent parts, if they're not subject to change
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for (auto & op_part: op->parts)
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{
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if (!op_part.sent && !op_part.done)
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{
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try_send(op, &op_part);
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}
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}
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}
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if (!op->sent_count)
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{
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if (op->done_count >= op->parts.size())
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{
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// Finished successfully
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// Even if the PG count has changed in meanwhile we treat it as success
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// because if some operations were invalid for the new PG count we'd get errors
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cur_ops.erase(op);
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op->retval = op->len;
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std::function<void(cluster_op_t*)>(op->callback)(op);
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continue_sync();
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return;
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}
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else if (op->retval != 0 && op->retval != -EPIPE)
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{
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// Fatal error (not -EPIPE)
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cur_ops.erase(op);
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if (!immediate_commit && op->opcode == OSD_OP_WRITE)
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{
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for (int i = 0; i < unsynced_writes.size(); i++)
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{
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if (unsynced_writes[i] == op)
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{
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unsynced_writes.erase(unsynced_writes.begin()+i, unsynced_writes.begin()+i+1);
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break;
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}
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}
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}
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bool del = op->is_internal;
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std::function<void(cluster_op_t*)>(op->callback)(op);
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if (del)
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{
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if (op->buf)
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free(op->buf);
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delete op;
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}
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continue_sync();
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return;
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}
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else
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{
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// -EPIPE or no error - clear the error
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op->retval = 0;
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if (op->needs_reslice)
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{
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op->parts.clear();
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op->done_count = 0;
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op->needs_reslice = false;
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continue_rw(op);
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}
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}
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}
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}
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void cluster_client_t::slice_rw(cluster_op_t *op)
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{
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// Slice the request into individual object stripe requests
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// Primary OSDs still operate individual stripes, but their size is multiplied by PG minsize in case of EC
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uint64_t pg_block_size = bs_block_size * pg_part_count;
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uint64_t first_stripe = (op->offset / pg_block_size) * pg_block_size;
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uint64_t last_stripe = ((op->offset + op->len + pg_block_size - 1) / pg_block_size - 1) * pg_block_size;
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op->retval = 0;
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op->parts.resize((last_stripe - first_stripe) / pg_block_size + 1);
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int i = 0;
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for (uint64_t stripe = first_stripe; stripe <= last_stripe; stripe += pg_block_size)
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{
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pg_num_t pg_num = (op->inode + stripe/pg_stripe_size) % pg_count + 1;
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uint64_t begin = (op->offset < stripe ? stripe : op->offset);
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uint64_t end = (op->offset + op->len) > (stripe + pg_block_size)
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? (stripe + pg_block_size) : (op->offset + op->len);
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op->parts[i] = {
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.parent = op,
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.offset = begin,
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.len = (uint32_t)(end - begin),
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.pg_num = pg_num,
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.buf = op->buf + begin - op->offset,
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.sent = false,
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.done = false,
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};
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i++;
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}
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}
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bool cluster_client_t::try_send(cluster_op_t *op, cluster_op_part_t *part)
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{
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auto pg_it = st_cli.pg_config.find(part->pg_num);
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if (pg_it != st_cli.pg_config.end() &&
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!pg_it->second.pause && pg_it->second.cur_primary)
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{
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osd_num_t primary_osd = pg_it->second.cur_primary;
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auto peer_it = msgr.osd_peer_fds.find(primary_osd);
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if (peer_it != msgr.osd_peer_fds.end())
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{
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int peer_fd = peer_it->second;
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part->osd_num = primary_osd;
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part->sent = true;
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op->sent_count++;
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part->op = {
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.op_type = OSD_OP_OUT,
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.peer_fd = peer_fd,
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.req = { .rw = {
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.header = {
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.magic = SECONDARY_OSD_OP_MAGIC,
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.id = op_id++,
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.opcode = op->opcode,
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},
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.inode = op->inode,
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.offset = part->offset,
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.len = part->len,
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} },
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.callback = [this, part](osd_op_t *op_part)
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{
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handle_op_part(part);
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},
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};
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part->op.iov.push_back(part->buf, part->len);
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msgr.outbox_push(&part->op);
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return true;
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}
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else if (msgr.wanted_peers.find(primary_osd) == msgr.wanted_peers.end())
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{
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msgr.connect_peer(primary_osd, st_cli.peer_states[primary_osd]);
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}
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}
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return false;
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}
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void cluster_client_t::execute_sync(cluster_op_t *op)
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{
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if (immediate_commit)
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{
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// Syncs are not required in the immediate_commit mode
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op->retval = 0;
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std::function<void(cluster_op_t*)>(op->callback)(op);
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}
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else if (next_writes.size() > 0 || cur_sync != NULL)
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{
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// There are some writes postponed to be executed after SYNC
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// Push this SYNC after them
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next_writes.push_back(op);
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}
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else
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{
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cur_sync = op;
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continue_sync();
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}
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}
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void cluster_client_t::continue_sync()
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{
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if (!cur_sync || cur_sync->parts.size() > 0)
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{
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// Already submitted
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return;
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}
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cur_sync->retval = 0;
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std::set<osd_num_t> sync_osds;
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for (auto prev_op: unsynced_writes)
|
|
{
|
|
if (prev_op->done_count < prev_op->parts.size())
|
|
{
|
|
// Writes not finished yet
|
|
return;
|
|
}
|
|
for (auto & part: prev_op->parts)
|
|
{
|
|
if (part.osd_num)
|
|
{
|
|
sync_osds.insert(part.osd_num);
|
|
}
|
|
}
|
|
}
|
|
if (!sync_osds.size())
|
|
{
|
|
// No dirty writes
|
|
finish_sync();
|
|
return;
|
|
}
|
|
// Check that all OSD connections are still alive
|
|
for (auto sync_osd: sync_osds)
|
|
{
|
|
auto peer_it = msgr.osd_peer_fds.find(sync_osd);
|
|
if (peer_it == msgr.osd_peer_fds.end())
|
|
{
|
|
// SYNC is pointless to send to a non connected OSD
|
|
return;
|
|
}
|
|
}
|
|
// Post sync to affected OSDs
|
|
cur_sync->parts.resize(sync_osds.size());
|
|
int i = 0;
|
|
for (auto sync_osd: sync_osds)
|
|
{
|
|
cur_sync->parts[i] = {
|
|
.parent = cur_sync,
|
|
.osd_num = sync_osd,
|
|
.sent = false,
|
|
.done = false,
|
|
};
|
|
send_sync(cur_sync, &cur_sync->parts[i]);
|
|
i++;
|
|
}
|
|
}
|
|
|
|
void cluster_client_t::finish_sync()
|
|
{
|
|
if (cur_sync->retval == -EPIPE)
|
|
{
|
|
// Retry later
|
|
cur_sync->parts.clear();
|
|
cur_sync->retval = 0;
|
|
cur_sync->sent_count = 0;
|
|
cur_sync->done_count = 0;
|
|
return;
|
|
}
|
|
std::function<void(cluster_op_t*)>(cur_sync->callback)(cur_sync);
|
|
if (!cur_sync->retval)
|
|
{
|
|
for (auto op: unsynced_writes)
|
|
{
|
|
if (op->is_internal)
|
|
{
|
|
if (op->buf)
|
|
free(op->buf);
|
|
delete op;
|
|
}
|
|
}
|
|
unsynced_writes.clear();
|
|
}
|
|
cur_sync = NULL;
|
|
int i;
|
|
for (i = 0; i < next_writes.size() && !cur_sync; i++)
|
|
{
|
|
if (next_writes[i]->opcode == OSD_OP_SYNC)
|
|
{
|
|
execute_sync(next_writes[i]);
|
|
}
|
|
else
|
|
{
|
|
cur_ops.insert(next_writes[i]);
|
|
continue_rw(next_writes[i]);
|
|
}
|
|
}
|
|
next_writes.erase(next_writes.begin(), next_writes.begin()+i);
|
|
}
|
|
|
|
void cluster_client_t::send_sync(cluster_op_t *op, cluster_op_part_t *part)
|
|
{
|
|
auto peer_it = msgr.osd_peer_fds.find(part->osd_num);
|
|
assert(peer_it != msgr.osd_peer_fds.end());
|
|
part->sent = true;
|
|
op->sent_count++;
|
|
part->op = {
|
|
.op_type = OSD_OP_OUT,
|
|
.peer_fd = peer_it->second,
|
|
.req = {
|
|
.hdr = {
|
|
.magic = SECONDARY_OSD_OP_MAGIC,
|
|
.id = op_id++,
|
|
.opcode = OSD_OP_SYNC,
|
|
},
|
|
},
|
|
.callback = [this, part](osd_op_t *op_part)
|
|
{
|
|
handle_op_part(part);
|
|
},
|
|
};
|
|
msgr.outbox_push(&part->op);
|
|
}
|
|
|
|
void cluster_client_t::handle_op_part(cluster_op_part_t *part)
|
|
{
|
|
cluster_op_t *op = part->parent;
|
|
part->sent = false;
|
|
op->sent_count--;
|
|
part->op.buf = NULL;
|
|
int expected = part->op.req.hdr.opcode == OSD_OP_SYNC ? 0 : part->op.req.rw.len;
|
|
if (part->op.reply.hdr.retval != expected)
|
|
{
|
|
// Operation failed, retry
|
|
printf(
|
|
"Operation failed on OSD %lu: retval=%ld (expected %d), dropping connection\n",
|
|
part->osd_num, part->op.reply.hdr.retval, expected
|
|
);
|
|
msgr.stop_client(part->op.peer_fd);
|
|
if (part->op.reply.hdr.retval && !retry_timeout_id)
|
|
{
|
|
retry_timeout_id = tfd->set_timer(up_wait_retry_interval, false, [this](int) { retry_timeout_id = 0; continue_ops(); });
|
|
}
|
|
if (!op->retval || op->retval == -EPIPE)
|
|
{
|
|
// Don't overwrite other errors with -EPIPE
|
|
op->retval = part->op.reply.hdr.retval;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// OK
|
|
part->done = true;
|
|
op->done_count++;
|
|
}
|
|
if (op->sent_count == 0)
|
|
{
|
|
if (op->opcode == OSD_OP_SYNC)
|
|
{
|
|
assert(op == cur_sync);
|
|
finish_sync();
|
|
}
|
|
else
|
|
{
|
|
continue_rw(op);
|
|
}
|
|
}
|
|
}
|