[ https://issues.apache.org/jira/browse/HDFS-11187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gabor Bota updated HDFS-11187: ------------------------------ Status: Patch Available (was: Reopened) Patch submitted for branch-2.7. Cherry-picking the commit from branch-2. Conflicts: hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FinalizedReplica.java hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java > 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, 2.10.0, 2.9.1, 2.8.4, 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-branch-2.7.001.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