xuzq created HDFS-15311:
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Summary: [SBN Read] High frequency reQueue cause Reader's
performance to degrade
Key: HDFS-15311
URL: https://issues.apache.org/jira/browse/HDFS-15311
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: xuzq
If _autoMsyncPeriodMs_ is 0, will do _msync_ for each read rpc.
On the observer server side, it will cause high frequency reQueue in Handler.
As the Queue is BlockingQueue, so it will cause Readers(small number) and
Handlers(large number) competing for BlockingQueue locks.
It will cause the throughput decrease.
Maybe we can let the handler sleep a little time to wait the StateId to
decrease ReQueue.
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