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From Martin Grimmer <Martin.Grim...@mgm-tp.com>
Subject Some warnings/erros before TServer shutdown.
Date Tue, 08 Dec 2015 08:52:34 GMT
Hello community,

I am using Accumulo 1.7. Yesterday there were following log messages before one of the tserver
went down.
Could you give me some hints about their meaning, to better understand what was happening?

2015-12-07 14:11:02,414 [util.MetadataTableUtil] ERROR: null
ConstraintViolationException(violationSummaries:[TConstraintViolationSummary(constrainClass:org.apache.accumulo.server.constraints.MetadataConstraints,
violationCode:7, violationDescription:Lock not held in zookeeper by writer, numberOfViolatingMutations:1)])

2015-12-07 14:11:02,415 [log.TabletServerLogger] ERROR: Unexpected error writing to log, retrying
attempt 2
java.lang.RuntimeException: ConstraintViolationException(violationSummaries:[TConstraintViolationSummary(constrainClass:org.apache.accumulo.server.constraints.MetadataConstraints,
violationCode:7, violationDescription:Lock not held in zookeeper by writer, numberOfViolatingMutations:1)])

2015-12-07 14:11:02,403 [impl.Writer] ERROR: error sending update to server2.cluster.org:9997:
ConstraintViolationException(violationSummaries:[TConstraintViolationSummary(constrainClass:org.apache.accumulo.server.constraints.MetadataConstraints,
violationCode:7, violationDescription:Lock not held in zookeeper by writer, numberOfViolatingMutations:1)])

2015-12-07 14:11:02,463 [zookeeper.DistributedWorkQueue] INFO : Got unexpected zookeeper event:
None for /accumulo/8a7f6781-ae6e-44bc-a717-5b8cbd28d647/recovery
2015-12-07 14:11:02,461 [util.MetadataTableUtil] ERROR: null
ConstraintViolationException(violationSummaries:[TConstraintViolationSummary(constrainClass:org.apache.accumulo.server.constraints.MetadataConstraints,
violationCode:7, violationDescription:Lock not held in zookeeper by writer, numberOfViolatingMutations:1)])

2015-12-07 14:11:02,476 [tserver.TabletServer] ERROR: Lost tablet server lock (reason = SESSION_EXPIRED),
exiting.
2015-12-07 14:11:02,476 [server.GarbageCollectionLogger] WARN : GC pause checker not called
in a timely fashion. Expected every 30.0 seconds but was 128.9 seconds since last check


I assume there was to much load on the server, so it got problems while communicating with
Zookeeper, am I right?

Best regards
Martin Grimmer

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