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Posted to hdfs-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2019/05/31 19:40:00 UTC

[jira] [Created] (HDFS-14534) NetworkTopology's fair lock has poor performance

Daryn Sharp created HDFS-14534:
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             Summary: NetworkTopology's fair lock has poor performance
                 Key: HDFS-14534
                 URL: https://issues.apache.org/jira/browse/HDFS-14534
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
            Reporter: Daryn Sharp


The {{NetworkTopology#netlock}} is a heavily accessed lock.  HADOOP-15486 made the lock fair to avoid starvation of a re-registering datanode that holds the fsn write lock while waiting for the topology write lock.  If nodes start flapping and re-registering, the contention with all other handlers becomes extreme.



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