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ASF GitHub Bot logged work on HDFS-16209: ----------------------------------------- Author: ASF GitHub Bot Created on: 08/Sep/21 04:40 Start Date: 08/Sep/21 04:40 Worklog Time Spent: 10m Work Description: ferhui commented on pull request #3378: URL: https://github.com/apache/hadoop/pull/3378#issuecomment-914906737 @tomscut Thanks for contribution. @ayushtkn @virajjasani @aajisaka @tasanuma Thanks for review! Merged to trunk. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org Issue Time Tracking ------------------- Worklog Id: (was: 647724) Time Spent: 3h 10m (was: 3h) > Add description for dfs.namenode.caching.enabled > ------------------------------------------------ > > Key: HDFS-16209 > URL: https://issues.apache.org/jira/browse/HDFS-16209 > Project: Hadoop HDFS > Issue Type: Improvement > Affects Versions: 3.1.0 > Reporter: tomscut > Assignee: tomscut > Priority: Major > Labels: pull-request-available > Fix For: 3.4.0 > > Time Spent: 3h 10m > Remaining Estimate: 0h > > Namenode config: > dfs.namenode.write-lock-reporting-threshold-ms=50ms > dfs.namenode.caching.enabled=true (default) > > In fact, the caching feature is not used in our cluster, but this switch is > turned on by default(dfs.namenode.caching.enabled=true), incurring some > additional write lock overhead. We count the number of write lock warnings in > a log file, and find that the number of rescan cache warnings reaches about > 32%, which greatly affects the performance of Namenode. > !namenode-write-lock.jpg! > > We should set 'dfs.namenode.caching.enabled' to false by default and turn it > on when we wants to use it. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org