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genericqa commented on HDFS-11187: ---------------------------------- | (x) *{color:red}-1 overall{color}* | \\ \\ || Vote || Subsystem || Runtime || Comment || | {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s{color} | {color:blue} Docker mode activated. {color} | | {color:red}-1{color} | {color:red} docker {color} | {color:red} 0m 5s{color} | {color:red} Docker failed to build yetus/hadoop:tp-17701. {color} | \\ \\ || Subsystem || Report/Notes || | JIRA Issue | HDFS-11187 | | JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12910582/HDFS-11187-branch-2.004.patch | | Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/23064/console | | Powered by | Apache Yetus 0.8.0-SNAPSHOT http://yetus.apache.org | This message was automatically generated. > Optimize disk access for last partial chunk checksum of Finalized replica > ------------------------------------------------------------------------- > > Key: HDFS-11187 > URL: https://issues.apache.org/jira/browse/HDFS-11187 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode > Reporter: Wei-Chiu Chuang > Assignee: Gabor Bota > Priority: Major > Fix For: 3.1.0, 3.0.2 > > Attachments: HDFS-11187-branch-2.001.patch, > HDFS-11187-branch-2.002.patch, HDFS-11187-branch-2.003.patch, > HDFS-11187-branch-2.004.patch, HDFS-11187.001.patch, HDFS-11187.002.patch, > HDFS-11187.003.patch, HDFS-11187.004.patch, HDFS-11187.005.patch > > > The patch at HDFS-11160 ensures BlockSender reads the correct version of > metafile when there are concurrent writers. > However, the implementation is not optimal, because it must always read the > last partial chunk checksum from disk while holding FsDatasetImpl lock for > every reader. It is possible to optimize this by keeping an up-to-date > version of last partial checksum in-memory and reduce disk access. > I am separating the optimization into a new jira, because maintaining the > state of in-memory checksum requires a lot more work. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org