ZanderXu created HDFS-16642:
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Summary: [HDFS] Moving selecting inputstream from JN in
EditlogTailer out of FSNLock
Key: HDFS-16642
URL: https://issues.apache.org/jira/browse/HDFS-16642
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: ZanderXu
Assignee: ZanderXu
EditlogTailer cost a long time for selecting InputStreams from Journalnode
while holding the write lock of FSNLock.
During this period, 8020 handlers of Observer NameNode will be blocked by the
FSN Lock.
In theory, selecting inputstreams from JournalNode does not involve changing
memory information in NameNode, so we can move the selecting out of the FSN
Lock, and it can improve the throughput of Observer NameNode.
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