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Commit8fa4a1a

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Sync PG_VERSION file in CREATE DATABASE.
An OS crash could leave PG_VERSION empty or missing. The same symptomappeared in a backup by block device snapshot, taken after the nextcheckpoint and before the OS flushes the PG_VERSION blocks. Devicesnapshots are not a documented backup method, however. Back-patch tov15, where commit9c08aea introducedSTRATEGY=WAL_LOG and made it the default.Discussion:https://postgr.es/m/20240130195003.0a.nmisch@google.com
1 parentd493bed commit8fa4a1a

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4 files changed

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4 files changed

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lines changed

‎doc/src/sgml/monitoring.sgml

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@@ -1519,6 +1519,11 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<entry><literal>TwophaseFileWrite</literal></entry>
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<entry>Waiting for a write of a two phase state file.</entry>
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</row>
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<row>
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<entry><literal>VersionFileSync</literal></entry>
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<entry>Waiting for the version file to reach durable storage while
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creating a database.</entry>
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</row>
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<row>
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<entry><literal>VersionFileWrite</literal></entry>
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<entry>Waiting for the version file to be written while creating a database.</entry>

‎src/backend/commands/dbcommands.c

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@@ -507,6 +507,14 @@ CreateDirAndVersionFile(char *dbpath, Oid dbid, Oid tsid, bool isRedo)
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}
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pgstat_report_wait_end();
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pgstat_report_wait_start(WAIT_EVENT_VERSION_FILE_SYNC);
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if (pg_fsync(fd)!=0)
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ereport(data_sync_elevel(ERROR),
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(errcode_for_file_access(),
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errmsg("could not fsync file \"%s\": %m",versionfile)));
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fsync_fname(dbpath, true);
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pgstat_report_wait_end();
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/* Close the version file. */
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CloseTransientFile(fd);
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‎src/backend/utils/activity/wait_event.c

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@@ -702,6 +702,9 @@ pgstat_get_wait_io(WaitEventIO w)
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caseWAIT_EVENT_TWOPHASE_FILE_WRITE:
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event_name="TwophaseFileWrite";
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break;
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caseWAIT_EVENT_VERSION_FILE_SYNC:
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event_name="VersionFileSync";
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break;
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caseWAIT_EVENT_VERSION_FILE_WRITE:
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event_name="VersionFileWrite";
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break;

‎src/include/utils/wait_event.h

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@@ -229,7 +229,8 @@ typedef enum
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WAIT_EVENT_WAL_READ,
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WAIT_EVENT_WAL_SYNC,
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WAIT_EVENT_WAL_SYNC_METHOD_ASSIGN,
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WAIT_EVENT_WAL_WRITE
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WAIT_EVENT_WAL_WRITE,
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WAIT_EVENT_VERSION_FILE_SYNC
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}WaitEventIO;
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