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ASF GitHub Bot logged work on HDFS-16429: ----------------------------------------- Author: ASF GitHub Bot Created on: 27/Jan/22 08:53 Start Date: 27/Jan/22 08:53 Worklog Time Spent: 10m Work Description: Hexiaoqiao merged pull request #3900: URL: https://github.com/apache/hadoop/pull/3900 -- 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: 716282) Time Spent: 1h 40m (was: 1.5h) > Add DataSetLockManager to manage fine-grain locks for FsDataSetImpl > ------------------------------------------------------------------- > > Key: HDFS-16429 > URL: https://issues.apache.org/jira/browse/HDFS-16429 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: hdfs > Reporter: Mingxiang Li > Assignee: Mingxiang Li > Priority: Major > Labels: pull-request-available > Time Spent: 1h 40m > Remaining Estimate: 0h > > 1、Use lockManager to maintain two level lock for FsDataSetImpl. > The simple lock model like this.Parts of implemented as follows > * As for finalizeReplica(),append(),createRbw()....First get BlockPoolLock > read lock,and then get BlockPoolLock-volume-lock write lock. > * As for getStoredBlock(),getMetaDataInputStream()....First get > BlockPoolLock read lock,and the then get BlockPoolLock-volume-lock read lock. > * As for deepCopyReplica(),getBlockReports() get the BlockPoolLock read lock. > * As for delete hold the BlockPoolLock write lock. > 2、Make LightWeightResizableGSet become thread safe.It not become performance > bottleneck if we make it thread safe.We can reduce lock grain size for > ReplicaMap when make LightWeightResizableGSet thread safe. -- 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