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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12443) Ozone: Improve SCM block deletion throttling algorithm
Date Fri, 27 Oct 2017 03:49:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16221677#comment-16221677
] 

Yiqun Lin commented on HDFS-12443:
----------------------------------

bq. But this approach makes it a bit difficult to prepare a reasonable size of TXs for DNs...
Thinking this problem again, I have a new idea that we can calculated this based on container
and block size that configured. The way calculated:
{noformat}
    int blockNumPerContainer = (int) Math
        .ceil(1.0 * containerSize / blockSize);
    return (int) Math.ceil(1.0 * keyLimit / blockNumPerContainer);
{noformat}
This way will be better than current hard-coded way.
Attach the v02 patch for adding this.

> 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
>
>
> 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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