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From "David Mollitor (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-14863) Remove Synchronization From BlockPlacementPolicyDefault
Date Fri, 20 Sep 2019 16:46:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-14863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

David Mollitor updated HDFS-14863:
----------------------------------
    Attachment: HDFS-14863.1.patch

> Remove Synchronization From BlockPlacementPolicyDefault
> -------------------------------------------------------
>
>                 Key: HDFS-14863
>                 URL: https://issues.apache.org/jira/browse/HDFS-14863
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: block placement
>    Affects Versions: 3.2.0
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Major
>         Attachments: HDFS-14863.1.patch
>
>
> https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockPlacementPolicyDefault.java#L1010
> The {{clusterMap}} has its own internal synchronization.  Also, these are only read operations
so any changes applied to the {{clusterMap}} from another thread will be applied since no
other thread synchronizes on the {{clusterMap}} itself (that I could find).



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