[ https://issues.apache.org/jira/browse/HDFS-12137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kihwal Lee updated HDFS-12137: ------------------------------ Resolution: Fixed Hadoop Flags: Reviewed Fix Version/s: 3.0.0-beta1 2.9.0 2.8.3 Status: Resolved (was: Patch Available) Thanks for the review, [~xiaochen] and the patch, Daryn. > 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: 2.8.3, 2.9.0, 3.0.0-beta1 > > 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