SplitLogManager - prevent unnecessary attempts to resubmits
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Key: HBASE-5618
URL: https://issues.apache.org/jira/browse/HBASE-5618
Project: HBase
Issue Type: Improvement
Reporter: Prakash Khemani
Currently once a watch fires that the task node has been updated (hearbeated)
by the worker, the splitlogmanager still quite some time before it updates the
"last heard from" time. This is because the manager currently schedules another
getDataSetWatch() and only after that finishes will it update the task's "last
heard from" time.
This leads to a large number of zk-BadVersion warnings when resubmission is
continuously attempted and it fails.
Two changes should be made
(1) On a resubmission failure because of BadVersion the task's lastUpdate time
should get upped.
(2) The task's lastUpdate time should get upped as soon as the
nodeDataChanged() watch fires and without waiting for getDataSetWatch() to
complete.
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