Konstantin Shvachko created HDFS-15291:
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Summary: [SBN read] Implement CyclicalBlockingQueue to avoid
requing RPC calls on Observer.
Key: HDFS-15291
URL: https://issues.apache.org/jira/browse/HDFS-15291
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Konstantin Shvachko
RPC queue is currently based on {{LinkedBlockingQueue}}, which is FIFO.
For Observer we delay execution of a call if its lastSeenStateId is larger than
the stateId of the Observer. The delay implemented as re-queuing the call to
the and of the queue. Re-queue is not atomic. We can avoid moving elements in
the queue by replacing {{LinkedBlockingQueue}} with a
{{CyclicalBlockingQueue}}. So that instead of re-queuing we just move the head
of the queue and the call automatically becomes the last.
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