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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12282) Ozone: DeleteKey-4: Block delete via HB between SCM and DN
Date Tue, 22 Aug 2017 06:46:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16136401#comment-16136401

Weiwei Yang commented on HDFS-12282:

Hi [~anu]

Thanks for your quick comments. I have addressed all in v2 patch except the last one, are
you suggesting to run the code in {{SCMNodeManager#handleHeartbeat}} in a thread? I am not
sure why that is necessary. This part of change only scans the block deletion transaction
log, get a throttled number of transactions and add them to the {{commandQueue}}, there is
no heavy I/O involved. We can certainly have some more discussion about this, probably tomorrow.

Thank you!

> Ozone: DeleteKey-4: Block delete via HB between SCM and DN
> ----------------------------------------------------------
>                 Key: HDFS-12282
>                 URL: https://issues.apache.org/jira/browse/HDFS-12282
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ozone, scm
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>         Attachments: Block delete via HB between SCM and DN.png, HDFS-12282-HDFS-7240.001.patch,
HDFS-12282-HDFS-7240.002.patch, HDFS-12282.WIP.patch
> This is the task 3 in the design doc, implements the SCM to datanode interactions. Including
> # SCM sends block deletion message via HB to datanode
> # datanode changes block state to deleting when processes the HB response
> # datanode sends deletion ACKs back to SCM
> # SCM handles ACKs and removes blocks in DB

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