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https://issues.apache.org/jira/browse/HDFS-3863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-3863:
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Attachment: hdfs-3863-prelim.txt
Hey Chao. What do you think of this patch? I'll do some cleanup before commit,
but please let me know if you think it looks correct and if you can spot some
more sanity checks to be added.
> QJM: track last "committed" txid
> --------------------------------
>
> Key: HDFS-3863
> URL: https://issues.apache.org/jira/browse/HDFS-3863
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha
> Affects Versions: QuorumJournalManager (HDFS-3077)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hdfs-3863-prelim.txt
>
>
> Per some discussion with [~stepinto]
> [here|https://issues.apache.org/jira/browse/HDFS-3077?focusedCommentId=13422579&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13422579],
> we should keep track of the "last committed txid" on each JournalNode. Then
> during any recovery operation, we can sanity-check that we aren't asked to
> truncate a log to an earlier transaction.
> This is also a necessary step if we want to support reading from in-progress
> segments in the future (since we should only allow reads up to the commit
> point)
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