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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12354) Ozone: Shuffle container list for datanode BlockDeletingService
Date Tue, 29 Aug 2017 08:46:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144949#comment-16144949
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Weiwei Yang commented on HDFS-12354:
------------------------------------

Thanks for confirming this, looks like TestKeys crashed the JVM. Will take a look at that
failure. Thanks I am going to commit this shortly.

> Ozone: Shuffle container list for datanode BlockDeletingService
> ---------------------------------------------------------------
>
>                 Key: HDFS-12354
>                 URL: https://issues.apache.org/jira/browse/HDFS-12354
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ozone
>            Reporter: Weiwei Yang
>            Assignee: Yiqun Lin
>         Attachments: HDFS-12354-HDFS-7240.001.patch, HDFS-12354-HDFS-7240.002.patch
>
>
> {{BlockDeletingService}} is a per-datanode container block deleting service takes in
charge of the "real" deletion of ozone blocks. It spawns a worker thread per container and
delete blocks/chunks from disk as background threads. The number of threads currently is throttled
by {{ozone.block.deleting.container.limit.per.interval}}, but there is a potential problem.
Containers are sorted so it always fetch same of containers, we need to fix this by creating
an API in {{ContainerManagerImpl}} to get a shuffled list of containers.



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