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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12354) Ozone: Shuffle container list for datanode BlockDeletingService
Date Tue, 29 Aug 2017 09:19:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144969#comment-16144969
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Yiqun Lin commented on HDFS-12354:
----------------------------------

Thanks weiwei, I have filling the JIRA HDFS-12370 to track for the TopN container choosing
policy. Let's discuss more in there. As I see you have give more detail info of this, I suppose
this should not be a complex task.

> 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
>             Fix For: HDFS-7240
>
>         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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