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Hudson commented on HDFS-12137: ------------------------------- SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #12010 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/12010/]) HDFS-12137. DN dataset lock should be fair. Contributed by Daryn Sharp. (kihwal: rev 8d86a93915ee00318289535d9c78e48b75c8359d) * (edit) hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java > DN dataset lock should be fair > ------------------------------ > > Key: HDFS-12137 > URL: https://issues.apache.org/jira/browse/HDFS-12137 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode > Affects Versions: 2.8.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Priority: Critical > Fix For: 2.9.0, 3.0.0-beta1, 2.8.3 > > Attachments: HDFS-12137.branch-2.patch, HDFS-12137.trunk.patch, > HDFS-12137.trunk.patch > > > The dataset lock is very highly contended. The unfair nature can be > especially harmful to the heartbeat handling. Under high loads, partially > expose by HDFS-12136 introducing disk i/o within the lock, the heartbeat > handling thread may process commands so slowly due to the contention that the > node becomes stale or falsely declared dead. The unfair lock is not helping > and appears to be causing frequent starvation under load. -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org