Raintung Li created SOLR-4099:
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Summary: Suspect zookeeper client thread doesn't call back the
watcher, that occur the overseer collection can't work normal.
Key: SOLR-4099
URL: https://issues.apache.org/jira/browse/SOLR-4099
Project: Solr
Issue Type: Bug
Components: SolrCloud
Affects Versions: 4.0, 4.0-BETA, 4.0-ALPHA
Environment: Zookeeper version: 3.2
Reporter: Raintung Li
In test environment, our zookeeper version is old that our requirement version.
Not use solr default 3.3.6 version.
The overseer collection processor stop work. Trace the dump, the overseer wait
for LatchChildWatcher.await.
Check the zookeeper /overseer/collection-queue-work, block a lot of operation
for collection.
Check the logic, suspect the zookeeper client doesn't call back the watchevent
that register the path "/overseer/collection-queue-work", unlucky the log level
is debug.
This case doesn't happen often, very little. But if it happen, it is fatal, we
have to stop the leader server.
We suggest the compensate solution, that doesn't await until notify. Only wait
some time that maybe it is ten minutes or a half of hour or other value to
recheck the queue again. Of cause if get the notify, that can direct work
normal.
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