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ASF GitHub Bot logged work on HDFS-16043: ----------------------------------------- Author: ASF GitHub Bot Created on: 06/Jan/22 08:37 Start Date: 06/Jan/22 08:37 Worklog Time Spent: 10m Work Description: zhuxiangyi commented on pull request #3063: URL: https://github.com/apache/hadoop/pull/3063#issuecomment-1006377205 @jojochuang Can it be merged into the trunk branch, and what else needs to be done? -- 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: 704468) Time Spent: 5h 20m (was: 5h 10m) > Add markedDeleteBlockScrubberThread to delete blocks asynchronously > ------------------------------------------------------------------- > > Key: HDFS-16043 > URL: https://issues.apache.org/jira/browse/HDFS-16043 > Project: Hadoop HDFS > Issue Type: Improvement > Components: hdfs, namanode > Affects Versions: 3.4.0 > Reporter: Xiangyi Zhu > Assignee: Xiangyi Zhu > Priority: Major > Labels: pull-request-available > Attachments: 20210527-after.svg, 20210527-before.svg > > Time Spent: 5h 20m > Remaining Estimate: 0h > > The deletion of the large directory caused NN to hold the lock for too long, > which caused our NameNode to be killed by ZKFC. > Through the flame graph, it is found that its main time-consuming > calculation is QuotaCount when removingBlocks(toRemovedBlocks) and deleting > inodes, and removeBlocks(toRemovedBlocks) takes a higher proportion of time. > h3. solution: > 1. RemoveBlocks is processed asynchronously. A thread is started in the > BlockManager to process the deleted blocks and control the lock time. > 2. QuotaCount calculation optimization, this is similar to the optimization > of this Issue HDFS-16000. > h3. Comparison before and after optimization: > Delete 1000w Inode and 1000w block test. > *before:* > remove inode elapsed time: 7691 ms > remove block elapsed time :11107 ms > *after:* > remove inode elapsed time: 4149 ms > remove block elapsed time :0 ms -- This message was sent by Atlassian Jira (v8.20.1#820001) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org