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https://issues.apache.org/jira/browse/HDFS-3752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865367#comment-13865367
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Rakesh R commented on HDFS-3752:
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Hi, As I understood from the discussion, when bootstrapping the standby it is
not very much required to see the transactions present in the 'in_progress'
node and skipping of 'in_progress' will not cause any inconsistencies. Anyway
StandbyToActive transition will always ensure, the edit delta transactions will
be read from the shared edit dirs and able to reliably start as Active.
bq.we could add an easy workaround flag, like "bootstrapStandby
-skipSharedEditsCheck", since the check here is just to help out the user and
not actually necessary for correct operation.
I also agree in skipping the shared edits check during bootstrapstandby, in
that case there is no special fix required for this JIRA.
Presently, there is no test cases for bootstrap with BKJM shared edits and I've
tried few. Could you please review the attached test case patch. If everyone
agrees, push this in and and can close this JIRA once HDFS-4120 is in. Any
thoughts?
> BOOTSTRAPSTANDBY for new Standby node will not work just after saveNameSpace
> at ANN in case of BKJM
> ---------------------------------------------------------------------------------------------------
>
> Key: HDFS-3752
> URL: https://issues.apache.org/jira/browse/HDFS-3752
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: 2.0.0-alpha
> Reporter: Vinay
> Attachments: HDFS-3752-testcase.patch
>
>
> 1. do {{saveNameSpace}} in ANN node by entering into safemode
> 2. in another new node, install standby NN and do BOOTSTRAPSTANDBY
> 3. Now StandBy NN will not able to copy the fsimage_txid from ANN
> This is because, SNN not able to find the next txid (txid+1) in shared
> storage.
> Just after {{saveNameSpace}} shared storage will have the new logsegment with
> only START_LOG_SEGEMENT edits op.
> and BookKeeper will not be able to read last entry from inprogress ledger.
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