Todd Lipcon created HDFS-3863:
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Summary: 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
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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