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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "MDSMap.h"
#include "MDSContext.h"
#include "msg/Messenger.h"
#include "MDSRank.h"
#include "MDLog.h"
#include "LogSegment.h"
#include "MDSTableClient.h"
#include "events/ETableClient.h"
#include "common/config.h"
#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".tableclient(" << get_mdstable_name(table) << ") "
class C_LoggedAck : public MDSLogContextBase {
MDSTableClient *tc;
version_t tid;
MDSRank *get_mds() override { return tc->mds; }
public:
C_LoggedAck(MDSTableClient *a, version_t t) : tc(a), tid(t) {}
void finish(int r) override {
tc->_logged_ack(tid);
}
};
void MDSTableClient::handle_request(const cref_t<MMDSTableRequest> &m)
{
dout(10) << "handle_request " << *m << dendl;
ceph_assert(m->table == table);
if (mds->get_state() < MDSMap::STATE_RESOLVE) {
if (mds->get_want_state() == CEPH_MDS_STATE_RESOLVE) {
mds->wait_for_resolve(new C_MDS_RetryMessage(mds, m));
}
return;
}
version_t tid = m->get_tid();
uint64_t reqid = m->reqid;
switch (m->op) {
case TABLESERVER_OP_QUERY_REPLY:
handle_query_result(m);
break;
case TABLESERVER_OP_NOTIFY_PREP:
ceph_assert(g_conf()->mds_kill_mdstable_at != 9);
handle_notify_prep(m);
break;
case TABLESERVER_OP_AGREE:
if (pending_prepare.count(reqid)) {
dout(10) << "got agree on " << reqid << " atid " << tid << dendl;
ceph_assert(g_conf()->mds_kill_mdstable_at != 3);
MDSContext *onfinish = pending_prepare[reqid].onfinish;
*pending_prepare[reqid].ptid = tid;
if (pending_prepare[reqid].pbl)
*pending_prepare[reqid].pbl = m->bl;
pending_prepare.erase(reqid);
prepared_update[tid] = reqid;
if (onfinish) {
onfinish->complete(0);
}
}
else if (prepared_update.count(tid)) {
dout(10) << "got duplicated agree on " << reqid << " atid " << tid << dendl;
ceph_assert(prepared_update[tid] == reqid);
ceph_assert(!server_ready);
}
else if (pending_commit.count(tid)) {
dout(10) << "stray agree on " << reqid << " tid " << tid
<< ", already committing, will resend COMMIT" << dendl;
ceph_assert(!server_ready);
// will re-send commit when receiving the server ready message
}
else {
dout(10) << "stray agree on " << reqid << " tid " << tid
<< ", sending ROLLBACK" << dendl;
ceph_assert(!server_ready);
auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_ROLLBACK, 0, tid);
mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
}
break;
case TABLESERVER_OP_ACK:
if (pending_commit.count(tid) &&
pending_commit[tid]->pending_commit_tids[table].count(tid)) {
dout(10) << "got ack on tid " << tid << ", logging" << dendl;
ceph_assert(g_conf()->mds_kill_mdstable_at != 7);
// remove from committing list
pending_commit[tid]->pending_commit_tids[table].erase(tid);
pending_commit.erase(tid);
// log ACK.
mds->mdlog->start_submit_entry(new ETableClient(table, TABLESERVER_OP_ACK, tid),
new C_LoggedAck(this, tid));
} else {
dout(10) << "got stray ack on tid " << tid << ", ignoring" << dendl;
}
break;
case TABLESERVER_OP_SERVER_READY:
ceph_assert(!server_ready);
server_ready = true;
if (last_reqid == ~0ULL)
last_reqid = reqid;
resend_queries();
resend_prepares();
resend_commits();
break;
default:
ceph_abort_msg("unrecognized mds_table_client request op");
}
}
void MDSTableClient::_logged_ack(version_t tid)
{
dout(10) << "_logged_ack " << tid << dendl;
// kick any waiters (LogSegment trim)
if (ack_waiters.count(tid)) {
dout(15) << "kicking ack waiters on tid " << tid << dendl;
mds->queue_waiters(ack_waiters[tid]);
ack_waiters.erase(tid);
}
}
void MDSTableClient::_prepare(bufferlist& mutation, version_t *ptid, bufferlist *pbl,
MDSContext *onfinish)
{
if (last_reqid == ~0ULL) {
dout(10) << "tableserver is not ready yet, waiting for request id" << dendl;
waiting_for_reqid.push_back(_pending_prepare(onfinish, ptid, pbl, mutation));
return;
}
uint64_t reqid = ++last_reqid;
dout(10) << "_prepare " << reqid << dendl;
pending_prepare[reqid].mutation = mutation;
pending_prepare[reqid].ptid = ptid;
pending_prepare[reqid].pbl = pbl;
pending_prepare[reqid].onfinish = onfinish;
if (server_ready) {
// send message
auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_PREPARE, reqid);
req->bl = mutation;
mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
} else
dout(10) << "tableserver is not ready yet, deferring request" << dendl;
}
void MDSTableClient::commit(version_t tid, LogSegment *ls)
{
dout(10) << "commit " << tid << dendl;
ceph_assert(prepared_update.count(tid));
prepared_update.erase(tid);
ceph_assert(pending_commit.count(tid) == 0);
pending_commit[tid] = ls;
ls->pending_commit_tids[table].insert(tid);
notify_commit(tid);
ceph_assert(g_conf()->mds_kill_mdstable_at != 4);
if (server_ready) {
// send message
auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_COMMIT, 0, tid);
mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
} else
dout(10) << "tableserver is not ready yet, deferring request" << dendl;
}
// recovery
void MDSTableClient::got_journaled_agree(version_t tid, LogSegment *ls)
{
dout(10) << "got_journaled_agree " << tid << dendl;
ls->pending_commit_tids[table].insert(tid);
pending_commit[tid] = ls;
notify_commit(tid);
}
void MDSTableClient::got_journaled_ack(version_t tid)
{
dout(10) << "got_journaled_ack " << tid << dendl;
if (pending_commit.count(tid)) {
pending_commit[tid]->pending_commit_tids[table].erase(tid);
pending_commit.erase(tid);
}
}
void MDSTableClient::resend_commits()
{
for (map<version_t,LogSegment*>::iterator p = pending_commit.begin();
p != pending_commit.end();
++p) {
dout(10) << "resending commit on " << p->first << dendl;
auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_COMMIT, 0, p->first);
mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
}
}
void MDSTableClient::resend_prepares()
{
while (!waiting_for_reqid.empty()) {
pending_prepare[++last_reqid] = waiting_for_reqid.front();
waiting_for_reqid.pop_front();
}
for (map<uint64_t, _pending_prepare>::iterator p = pending_prepare.begin();
p != pending_prepare.end();
++p) {
dout(10) << "resending prepare on " << p->first << dendl;
auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_PREPARE, p->first);
req->bl = p->second.mutation;
mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
}
}
void MDSTableClient::handle_mds_failure(mds_rank_t who)
{
if (who != mds->get_mds_map()->get_tableserver())
return; // do nothing.
dout(7) << "tableserver mds." << who << " fails" << dendl;
server_ready = false;
}
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