[ https://issues.apache.org/jira/browse/HDFS-7531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vinod Kumar Vavilapalli updated HDFS-7531: ------------------------------------------ Target Version/s: 2.7.0, 3.0.0 (was: 3.0.0, 2.7.0) Fix Version/s: 2.6.1 [~sjlee0] backported this to 2.6.1, with minor changes to accomodate older JDKs. I just pushed the commit to 2.6.1 after running compilation and TestFsDatasetImpl which changed in the patch. > Improve the concurrent access on FsVolumeList > --------------------------------------------- > > Key: HDFS-7531 > URL: https://issues.apache.org/jira/browse/HDFS-7531 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode > Affects Versions: 2.6.0 > Reporter: Lei (Eddy) Xu > Assignee: Lei (Eddy) Xu > Labels: 2.6.1-candidate > Fix For: 2.7.0, 2.6.1 > > Attachments: HDFS-7531.000.patch, HDFS-7531.001.patch, > HDFS-7531.002.patch > > > {{FsVolumeList}} uses {{synchronized}} to protect the update on > {{FsVolumeList#volumes}}, while various operations (e.g., {{checkDirs()}}, > {{getAvailable()}}) iterate {{volumes}} without protection. > This JIRA proposes to use {{AtomicReference}} to encapture {{volumes}} to > provide better concurrent access. -- This message was sent by Atlassian JIRA (v6.3.4#6332)