Todd Lipcon created HDFS-3693:
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Summary: 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
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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