Fix inadequacies in recently added wait events
In commit 9915de6c1c, we introduced a new wait point for replication
slots and incorrectly labelled it as wait event PG_WAIT_LOCK. That's
wrong, so invent an appropriate new wait event instead, and document it
properly.
While at it, fix numerous other problems in the vicinity:
- two different walreceiver wait events were being mixed up in a single
wait event (which wasn't documented either); split it out so that they
can be distinguished, and document the new events properly.
- ParallelBitmapPopulate was documented but didn't exist.
- ParallelBitmapScan was not documented (I think this should be called
"ParallelBitmapScanInit" instead.)
- Logical replication wait events weren't documented
- various symbols had been added in dartboard order in various places.
Put them in alphabetical order instead, as was originally intended.
Discussion: https://postgr.es/m/20170808181131.mu4fjepuh5m75cyq@alvherre.pgsql
This commit is contained in:
Alvaro Herrera
parent
b4a2eea030
commit
030273b7ea
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@ -1175,6 +1175,14 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry><literal>CheckpointerMain</></entry>
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<entry>Waiting in main loop of checkpointer process.</entry>
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</row>
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<row>
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<entry><literal>LogicalLauncherMain</></entry>
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<entry>Waiting in main loop of logical launcher process.</entry>
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</row>
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<row>
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<entry><literal>LogicalApplyMain</></entry>
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<entry>Waiting in main loop of logical apply process.</entry>
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</row>
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<row>
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<entry><literal>PgStatMain</></entry>
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<entry>Waiting in main loop of the statistics collector process.</entry>
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@ -1212,6 +1220,14 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry><literal>ClientWrite</></entry>
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<entry>Waiting to write data from the client.</entry>
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</row>
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<row>
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<entry><literal>LibPQWalReceiverConnect</></entry>
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<entry>Waiting in WAL receiver to establish connection to remote server.<entry>
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</row>
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<row>
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<entry><literal>LibPQWalReceiverReceive</></entry>
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<entry>Waiting in WAL receiver to receive data from remote server.<entry>
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</row>
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<row>
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<entry><literal>SSLOpenServer</></entry>
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<entry>Waiting for SSL while attempting connection.</entry>
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@ -1250,6 +1266,14 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry><literal>ExecuteGather</></entry>
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<entry>Waiting for activity from child process when executing <literal>Gather</> node.</entry>
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</row>
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<row>
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<entry><literal>LogicalSyncData</></entry>
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<entry>Waiting for logical replication remote server to send data for initial table synchronization.</entry>
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</row>
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<row>
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<entry><literal>LogicalSyncStateChange</></entry>
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<entry>Waiting for logical replication remote server to change state.</entry>
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</row>
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<row>
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<entry><literal>MessageQueueInternal</></entry>
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<entry>Waiting for other process to be attached in shared message queue.</entry>
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@ -1271,13 +1295,17 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry>Waiting for parallel workers to finish computing.</entry>
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</row>
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<row>
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<entry><literal>ParallelBitmapPopulate</></entry>
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<entry>Waiting for the leader to populate the TidBitmap.</entry>
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<entry><literal>ParallelBitmapScan</></entry>
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<entry>Waiting for parallel bitmap scan to become initialized.</entry>
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</row>
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<row>
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<entry><literal>ProcArrayGroupUpdate</></entry>
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<entry>Waiting for group leader to clear transaction id at transaction end.</entry>
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</row>
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<row>
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<entry><literal>ReplicationSlotDrop</></entry>
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<entry>Waiting for a replication slot to become inactive to be dropped.</entry>
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</row>
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<row>
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<entry><literal>SafeSnapshot</></entry>
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<entry>Waiting for a snapshot for a <literal>READ ONLY DEFERRABLE</> transaction.</entry>
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@ -3481,6 +3481,12 @@ pgstat_get_wait_activity(WaitEventActivity w)
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case WAIT_EVENT_CHECKPOINTER_MAIN:
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event_name = "CheckpointerMain";
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break;
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case WAIT_EVENT_LOGICAL_LAUNCHER_MAIN:
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event_name = "LogicalLauncherMain";
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break;
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case WAIT_EVENT_LOGICAL_APPLY_MAIN:
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event_name = "LogicalApplyMain";
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break;
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case WAIT_EVENT_PGSTAT_MAIN:
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event_name = "PgStatMain";
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break;
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@ -3502,12 +3508,6 @@ pgstat_get_wait_activity(WaitEventActivity w)
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case WAIT_EVENT_WAL_WRITER_MAIN:
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event_name = "WalWriterMain";
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break;
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case WAIT_EVENT_LOGICAL_LAUNCHER_MAIN:
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event_name = "LogicalLauncherMain";
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break;
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case WAIT_EVENT_LOGICAL_APPLY_MAIN:
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event_name = "LogicalApplyMain";
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break;
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/* no default case, so that compiler will warn */
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}
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@ -3533,15 +3533,18 @@ pgstat_get_wait_client(WaitEventClient w)
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case WAIT_EVENT_CLIENT_WRITE:
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event_name = "ClientWrite";
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break;
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case WAIT_EVENT_LIBPQWALRECEIVER_CONNECT:
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event_name = "LibPQWalReceiverConnect";
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break;
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case WAIT_EVENT_LIBPQWALRECEIVER_RECEIVE:
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event_name = "LibPQWalReceiverReceive";
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break;
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case WAIT_EVENT_SSL_OPEN_SERVER:
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event_name = "SSLOpenServer";
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break;
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case WAIT_EVENT_WAL_RECEIVER_WAIT_START:
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event_name = "WalReceiverWaitStart";
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break;
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case WAIT_EVENT_LIBPQWALRECEIVER:
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event_name = "LibPQWalReceiver";
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break;
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case WAIT_EVENT_WAL_SENDER_WAIT_WAL:
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event_name = "WalSenderWaitForWAL";
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break;
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@ -3579,6 +3582,12 @@ pgstat_get_wait_ipc(WaitEventIPC w)
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case WAIT_EVENT_EXECUTE_GATHER:
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event_name = "ExecuteGather";
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break;
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case WAIT_EVENT_LOGICAL_SYNC_DATA:
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event_name = "LogicalSyncData";
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break;
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case WAIT_EVENT_LOGICAL_SYNC_STATE_CHANGE:
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event_name = "LogicalSyncStateChange";
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break;
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case WAIT_EVENT_MQ_INTERNAL:
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event_name = "MessageQueueInternal";
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break;
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@ -3600,18 +3609,15 @@ pgstat_get_wait_ipc(WaitEventIPC w)
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case WAIT_EVENT_PROCARRAY_GROUP_UPDATE:
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event_name = "ProcArrayGroupUpdate";
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break;
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case WAIT_EVENT_REPLICATION_SLOT_DROP:
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event_name = "ReplicationSlotDrop";
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break;
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case WAIT_EVENT_SAFE_SNAPSHOT:
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event_name = "SafeSnapshot";
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break;
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case WAIT_EVENT_SYNC_REP:
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event_name = "SyncRep";
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break;
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case WAIT_EVENT_LOGICAL_SYNC_DATA:
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event_name = "LogicalSyncData";
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break;
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case WAIT_EVENT_LOGICAL_SYNC_STATE_CHANGE:
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event_name = "LogicalSyncStateChange";
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break;
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/* no default case, so that compiler will warn */
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}
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@ -181,7 +181,7 @@ libpqrcv_connect(const char *conninfo, bool logical, const char *appname,
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WL_LATCH_SET | io_flag,
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PQsocket(conn->streamConn),
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0,
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WAIT_EVENT_LIBPQWALRECEIVER);
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WAIT_EVENT_LIBPQWALRECEIVER_CONNECT);
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/* Emergency bailout? */
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if (rc & WL_POSTMASTER_DEATH)
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@ -582,7 +582,7 @@ libpqrcv_PQexec(PGconn *streamConn, const char *query)
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WL_LATCH_SET,
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PQsocket(streamConn),
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0,
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WAIT_EVENT_LIBPQWALRECEIVER);
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WAIT_EVENT_LIBPQWALRECEIVER_RECEIVE);
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/* Emergency bailout? */
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if (rc & WL_POSTMASTER_DEATH)
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@ -391,7 +391,8 @@ retry:
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name, active_pid)));
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/* Wait here until we get signaled, and then restart */
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ConditionVariableSleep(&slot->active_cv, PG_WAIT_LOCK);
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ConditionVariableSleep(&slot->active_cv,
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WAIT_EVENT_REPLICATION_SLOT_DROP);
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ConditionVariableCancelSleep();
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goto retry;
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}
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@ -759,15 +759,15 @@ typedef enum
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WAIT_EVENT_BGWRITER_HIBERNATE,
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WAIT_EVENT_BGWRITER_MAIN,
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WAIT_EVENT_CHECKPOINTER_MAIN,
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WAIT_EVENT_LOGICAL_LAUNCHER_MAIN,
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WAIT_EVENT_LOGICAL_APPLY_MAIN,
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WAIT_EVENT_PGSTAT_MAIN,
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WAIT_EVENT_RECOVERY_WAL_ALL,
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WAIT_EVENT_RECOVERY_WAL_STREAM,
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WAIT_EVENT_SYSLOGGER_MAIN,
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WAIT_EVENT_WAL_RECEIVER_MAIN,
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WAIT_EVENT_WAL_SENDER_MAIN,
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WAIT_EVENT_WAL_WRITER_MAIN,
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WAIT_EVENT_LOGICAL_LAUNCHER_MAIN,
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WAIT_EVENT_LOGICAL_APPLY_MAIN
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WAIT_EVENT_WAL_WRITER_MAIN
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} WaitEventActivity;
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/* ----------
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@ -782,9 +782,10 @@ typedef enum
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{
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WAIT_EVENT_CLIENT_READ = PG_WAIT_CLIENT,
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WAIT_EVENT_CLIENT_WRITE,
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WAIT_EVENT_LIBPQWALRECEIVER_CONNECT,
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WAIT_EVENT_LIBPQWALRECEIVER_RECEIVE,
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WAIT_EVENT_SSL_OPEN_SERVER,
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WAIT_EVENT_WAL_RECEIVER_WAIT_START,
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WAIT_EVENT_LIBPQWALRECEIVER,
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WAIT_EVENT_WAL_SENDER_WAIT_WAL,
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WAIT_EVENT_WAL_SENDER_WRITE_DATA
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} WaitEventClient;
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@ -802,6 +803,8 @@ typedef enum
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WAIT_EVENT_BGWORKER_STARTUP,
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WAIT_EVENT_BTREE_PAGE,
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WAIT_EVENT_EXECUTE_GATHER,
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WAIT_EVENT_LOGICAL_SYNC_DATA,
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WAIT_EVENT_LOGICAL_SYNC_STATE_CHANGE,
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WAIT_EVENT_MQ_INTERNAL,
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WAIT_EVENT_MQ_PUT_MESSAGE,
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WAIT_EVENT_MQ_RECEIVE,
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@ -809,10 +812,9 @@ typedef enum
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WAIT_EVENT_PARALLEL_FINISH,
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WAIT_EVENT_PARALLEL_BITMAP_SCAN,
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WAIT_EVENT_PROCARRAY_GROUP_UPDATE,
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WAIT_EVENT_REPLICATION_SLOT_DROP,
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WAIT_EVENT_SAFE_SNAPSHOT,
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WAIT_EVENT_SYNC_REP,
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WAIT_EVENT_LOGICAL_SYNC_DATA,
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WAIT_EVENT_LOGICAL_SYNC_STATE_CHANGE
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WAIT_EVENT_SYNC_REP
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} WaitEventIPC;
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/* ----------
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