HA: Appropriately handle error conditions in EditLogTailer
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Key: HDFS-2709
URL: https://issues.apache.org/jira/browse/HDFS-2709
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ha, name-node
Affects Versions: HA branch (HDFS-1623)
Reporter: Todd Lipcon
Assignee: Aaron T. Myers
Priority: Critical
Currently if the edit log tailer experiences an error replaying edits in the
middle of a file, it will go back to retrying from the beginning of the file on
the next tailing iteration. This is incorrect since many of the edits will have
already been replayed, and not all edits are idempotent.
Instead, we either need to (a) support reading from the middle of a finalized
file (ie skip those edits already applied), or (b) abort the standby if it hits
an error while tailing. If "a" isn't simple, let's do "b" for now and come back
to 'a' later since this is a rare circumstance and better to abort than be
incorrect.
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