What the server busy? Was there high iowait? Was the JVM spending a lot of time in GCs?

You haven't provided enough information to prove that you saw the same thing I reported in ACCUMULO-3336.

This is most likely an issue you need to figure out on properly configuring Accumulo for your system, not a bug in Accumulo.

Noe Detore wrote:
Any updates on this issue
https://issues.apache.org/jira/browse/ACCUMULO-3336 ? I am seeing this
behavior using 1.7.2 on one of our clusters. Not seeing on other
clusters, but what could be some causes? Swap on server looks good as
there is none. Are there particular configurations to adjust?

org.apache.zookeeper.KeeperException$SessionExpiredException:
KeeperErrorCode = Session expired ...
2016-10-06 23:22:30,633 [zookeeper.DistributedWorkQueue] INFO : Got
unexpected zookeeper event: None for ...
2016-10-06 23:22:30,679 [tserver.TabletServer] ERROR: Lost tablet server
lock (reason = SESSION_EXPIRED), exiting

Thanks
Noe

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