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Add checksum delta for incremental backups.

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Use checksums rather than timestamps to determine if files have changed.  This is useful in cases where the timestamps may not be trustworthy, e.g. when performing an incremental after failing over to a standby.

If checksum delta is enabled then checksums will be used for verification of resumed backups, even if they are full.  Resumes have always used checksums to verify the files in the repository, enabling delta performs checksums on the database files as well.

Note that the user must manually enable this feature in cases were it would be useful or just keep in enabled all the time.  A future commit will address automatically enabling the feature in cases where it seems likely to be useful.

Contributed by Cynthia Shang.
This commit is contained in:
Cynthia Shang
2018-09-19 11:12:45 -04:00
committed by David Steele
parent bf0691576a
commit 880fbb5e57
25 changed files with 2356 additions and 913 deletions
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4
test/lib/pgBackRestTest/Module/Real/RealAllTest.pm
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@@ -619,10 +619,12 @@ sub run
$oHostDbMaster->sqlSelectOne("select pg_start_backup('test backup that will be restarted', true)");
}
# Exercise --delta checksum option
$oExecuteBackup = $oHostBackup->backupBegin(
CFGOPTVAL_BACKUP_TYPE_INCR, 'update during backup',
{strTest => TEST_MANIFEST_BUILD, fTestDelay => $fTestDelay,
strOptionalParam => '--' . cfgOptionName(CFGOPT_STOP_AUTO) . ' --' . cfgOptionName(CFGOPT_BUFFER_SIZE) . '=32768'});
strOptionalParam => '--' . cfgOptionName(CFGOPT_STOP_AUTO) . ' --' . cfgOptionName(CFGOPT_BUFFER_SIZE) . '=32768' .
' --delta'});
# Drop a table
$oHostDbMaster->sqlExecute('drop table test_remove');