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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12354) Ozone: Shuffle container list for datanode BlockDeletingService
Date Fri, 25 Aug 2017 09:34:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141419#comment-16141419
] 

Yiqun Lin commented on HDFS-12354:
----------------------------------

It's a good point, [~cheersyang]. I am thinking one another way, every time we can get top
n containers sorted by under deletion blocks num? Is this a better way than just get a shuffle
list?  This way can also ensure we will not get the same container list but it depends on
querying the deleted blocks within interval time. How do you think?

> 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: Weiwei Yang
>
> {{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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