[jira] [Created] (HDFS-15291) [SBN read] Implement CyclicalBlockingQueue to avoid requing RPC calls on Observer.

["Konstantin Shvachko (Jira)" <ji...@apache.org>]

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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