[jira] [Commented] (HDDS-8303) Some snapshotDiff command returns empty result when multiple snapshots diff commands run concurrently

["Wei-Chiu Chuang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDDS-8303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17757066#comment-17757066 ] 

Wei-Chiu Chuang commented on HDDS-8303:
---------------------------------------

[~dteng] this looks critical. is this still the case now? is there a reproduction test case?

> Some snapshotDiff command returns empty result when multiple snapshots diff commands run concurrently
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HDDS-8303
>                 URL: https://issues.apache.org/jira/browse/HDDS-8303
>             Project: Apache Ozone
>          Issue Type: Bug
>            Reporter: Dave Teng
>            Priority: Major
>
> Some snapshotDiff command returns empty result when multiple snapshots diff commands run concurrently.
> I tried to run 50 concurrent snapshotDiff command against 50 different set of snapshots which were different (They all contained different key-operations differences between snapshots. So these key namespaces between snapshots are all different.). Only two processes returns the snapshot diff reports, the other processes returned empty response. The expected result should not be empty unless two snapshots contains no difference in key namespace. However each snapshotDiff command I run here used different snapshots which contains different keys namespace, empty response should not happen in theory.



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