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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12443) Ozone: Improve SCM block deletion throttling algorithm
Date Mon, 06 Nov 2017 10:22:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240109#comment-16240109
] 

Weiwei Yang commented on HDFS-12443:
------------------------------------

Hi [~linyiqun]

v5 patch looks excellent to me, +1, thanks for addressing all the comments.
I am just not sure what does this in the jenkins report mean

{noformat}
Unreaped Processes	hadoop-hdfs:2
{noformat}

if that is not harmful, please feel free to commit this patch. Thanks for getting this done.

> Ozone: Improve SCM block deletion throttling algorithm 
> -------------------------------------------------------
>
>                 Key: HDFS-12443
>                 URL: https://issues.apache.org/jira/browse/HDFS-12443
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone, scm
>            Reporter: Weiwei Yang
>            Assignee: Yiqun Lin
>              Labels: OzonePostMerge
>         Attachments: HDFS-12443-HDFS-7240.001.patch, HDFS-12443-HDFS-7240.002.patch,
HDFS-12443-HDFS-7240.002.patch, HDFS-12443-HDFS-7240.003.patch, HDFS-12443-HDFS-7240.004.patch,
HDFS-12443-HDFS-7240.005.patch, HDFS-12443-SCM-blockdeletion-throttle.pdf
>
>
> Currently SCM scans delLog to send deletion transactions to datanode periodically, the
throttling algorithm is simple, it scans at most {{BLOCK_DELETE_TX_PER_REQUEST_LIMIT}} (by
default 50) at a time. This is non-optimal, worst case it might cache 50 TXs for 50 different
DNs so each DN will only get 1 TX to proceed in an interval, this will make the deletion slow.
An improvement to this is to make this throttling by datanode, e.g 50 TXs per datanode per
interval.



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