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https://issues.apache.org/jira/browse/KUDU-2562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Percy updated KUDU-2562:
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Description:
Checkpoint the highest legal timestamp in the tablet superblock when tablet
history GC deletes data so that increasing the AHM age doesn’t expose us to
inconsistent scans after a GC.
This is a real edge case and is a temporary condition depending on users
restarting with a changed configuration flag. However without this safety
feature, users can get bad scans if they increase the
{{[--tablet_history_max_age_sec|http://kudu.apache.org/docs/configuration_reference.html#kudu-tserver_tablet_history_max_age_sec]}}
command-line flag after a GC operation runs.
was:
Checkpoint the highest legal timestamp in the tablet superblock when tablet
history GC deletes data so that increasing the AHM age doesn’t expose us to
inconsistent scans after a GC.
This is a real edge case and is a temporary condition depending on users
restarting with a changed configuration flag. However without this safety
feature, users can get bad scans if they change the flag.
> Checkpoint highest legal timestamp in tablet superblock when tablet history
> GC deletes data
> -------------------------------------------------------------------------------------------
>
> Key: KUDU-2562
> URL: https://issues.apache.org/jira/browse/KUDU-2562
> Project: Kudu
> Issue Type: Improvement
> Components: tablet
> Affects Versions: 1.7.1
> Reporter: Mike Percy
> Priority: Minor
>
> Checkpoint the highest legal timestamp in the tablet superblock when tablet
> history GC deletes data so that increasing the AHM age doesn’t expose us to
> inconsistent scans after a GC.
> This is a real edge case and is a temporary condition depending on users
> restarting with a changed configuration flag. However without this safety
> feature, users can get bad scans if they increase the
> {{[--tablet_history_max_age_sec|http://kudu.apache.org/docs/configuration_reference.html#kudu-tserver_tablet_history_max_age_sec]}}
> command-line flag after a GC operation runs.
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