Todd Lipcon created HDFS-3725:
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Summary: Fix QJM startup when individual JNs have gaps
Key: HDFS-3725
URL: https://issues.apache.org/jira/browse/HDFS-3725
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha
Affects Versions: QuorumJournalManager (HDFS-3077)
Reporter: Todd Lipcon
Assignee: Todd Lipcon
Priority: Minor
This fixes a bug in the HDFS-3077 branch:
If one of the JNs goes down and comes back up, it may have a discontiguous set
of logs in its storage directories. This means that a future
{{getEditLogManifest}} call will return a manifest that has gaps - eg it may
have txn 1-3 and 7-9 but be missing 4-6. This is OK because it's guaranteed
that a quorum of JNs do have those edits elsewhere.
This situation currently causes an exception since the RemoteEditLogManifest
constructor verifies that the returned log files form a contiguous set of
edits. That was true for the NameNode but no longer true for this new usage.
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