Raintung Li created SOLR-4073:
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Summary: Overseer will miss operations in some cases.
Key: SOLR-4073
URL: https://issues.apache.org/jira/browse/SOLR-4073
Project: Solr
Issue Type: Bug
Components: SolrCloud
Affects Versions: 4.0, 4.0-BETA, 4.0-ALPHA
Environment: Solr cloud
Reporter: Raintung Li
One overseer disconnect with Zookeeper, but overseer thread still handle the
request(A) in the DistributedQueue. Example: overseer thread reconnect
Zookeeper try to remove the Top's request. "workQueue.remove();".
Now the other server will take over the overseer privilege because old overseer
disconnect. Start overseer thread and handle the queue request(A) again, and
remove the request(A) from queue, then try to get the top's request(B, doesn't
get). In the this time old overseer reconnect with ZooKeeper, and remove the
top's request from queue. Now the top request is B, it is moved by old overseer
server. New overseer server never do B request,because this request deleted by
old overseer server, at the last this request(B) miss operations.
At best, distributeQueue.peek can get the request's ID that will be removed for
workqueue.remove(ID), not remove the top's request.
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