Allan Yang created HBASE-18132:
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Summary: Low replication should be checked in period in case of
datanode rolling upgrade
Key: HBASE-18132
URL: https://issues.apache.org/jira/browse/HBASE-18132
Project: HBase
Issue Type: Bug
Affects Versions: 1.1.10, 1.4.0
Reporter: Allan Yang
Assignee: Allan Yang
For now, we just check low replication of WALs when there is a sync operation
(HBASE-2234), rolling the log if the replica of the WAL is less than
configured. But if the WAL has very little writes or no writes at all, low
replication will not be detected and thus no log will be rolled.
That is a problem when rolling updating datanode, all replica of the WAL with
no writes will be restarted and lead to the WAL file end up with a abnormal
state. Later operation of opening this file will be always failed.
I bring up a patch to check low replication of WALs at a configured period.
When rolling updating datanodes, we just make sure the restart interval time
between two nodes is bigger than the low replication check time, the WAL will
be closed and rolled normally. A UT in the patch will show everything.
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