[hbase] HLog generates incorrect file name when splitting a log, race
condition also contributes
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Key: HADOOP-2079
URL: https://issues.apache.org/jira/browse/HADOOP-2079
Project: Hadoop
Issue Type: Bug
Components: contrib/hbase
Affects Versions: 0.16.0
Reporter: Jim Kellerman
Assignee: Jim Kellerman
Fix For: 0.16.0
In Hadoop-Nightly #277 TestRegionServerExit failed with a timeout.
The reason for this was a race in the Master in which checkAssigned (run from
either the root or meta scanner) will immediately try to split the log and
then assign a region which has invalid server info.
The scenario went something like this:
1. region server aborted
2. root region was written on optional cache flush
lease timed out on aborted server which removes it from serversToServerInfo and
queues a PendingServerShutdown operation
3. root scanner runs and finds server info incorrect (it is in the root region
but the server is not in serversToServerInfo
4. checkAssigned starts splitting the log but because the log name is incorrect
it can't finish
5. PendingServerShutdown fires and really gums up the works.
So there are two problems:
1. HLog.splitLog needs to generate the correct log file name.
2. PendingServerShutdown and/or leaseExpired need to cooperate with
checkAssigned so that there are not two concurrent attempts to recover the log.
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