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https://issues.apache.org/jira/browse/HDFS-3693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved HDFS-3693.
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Resolution: Fixed
Fix Version/s: QuorumJournalManager (HDFS-3077)
Hadoop Flags: Reviewed
Committed to branch, with nit addressed in the commit. Thanks for reviewing.
> QJM: JNStorage should read its storage info even before a writer becomes
> active
> -------------------------------------------------------------------------------
>
> Key: HDFS-3693
> URL: https://issues.apache.org/jira/browse/HDFS-3693
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: QuorumJournalManager (HDFS-3077)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: QuorumJournalManager (HDFS-3077)
>
> Attachments: hdfs-3693.txt
>
>
> In order for QJM to work with HA, the standby needs to be able to read from a
> JournalNode even when no active has written to it. In the current code, it
> reads the StorageInfo only when {{newEpoch()}} is called. But, that's only
> called when a writer becomes active. This causes the SBN to fail at startup
> since the JN thinks its storage info is uninitialized.
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