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https://issues.apache.org/jira/browse/HDDS-3481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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runzhiwang updated HDDS-3481:
-----------------------------
Description:
*What's the problem ?*
As the image shows, scm ask 31 datanodes to replicate container 2037 every 10
minutes from 2020-04-17 23:38:51. And at 2020-04-18 08:58:52 scm find the
replicate num of container 2037 is 12, then it ask 11 datanodes to delete
container 2037.
!screenshot-1.png!
!screenshot-2.png!
*What's the reason ?*
scm check whether (container replicates num +
inflightReplication.get(containerId).size() -
inflightDeletion.get(containerId).size()) is less than 3. If less than 3, it
will ask some datanode to replicate the container, and add the action into
inflightReplication.get(containerId). The replicate action time out is 10
minutes, if action timeout, scm will delete the action from
inflightReplication.get(containerId) as the image shows. Then (container
replicates num + inflightReplication.get(containerId).size() -
inflightDeletion.get(containerId).size()) is less than 3 again, and scm ask
another datanode to replicate the container.
Because replicate container cost a long time, sometimes it cannot finish in 10
minutes, thus 31 datanodes has to replicate the container every 10 minutes. 19
of 31 datanodes replicate container from the same source datanode, it will
also cause big pressure on the source datanode and replicate container become
slower. Actually it cost 4 hours to finish the first replicate.
!screenshot-4.png!
was:
*What's the problem ?*
As the image shows, scm ask 31 datanodes to replicate container 2037 every 10
minutes from 2020-04-17 23:38:51. And at 2020-04-18 08:58:52 scm find the
replicate num of container 2037 is 12, then it ask 11 datanodes to delete
container 2037.
!screenshot-1.png!
!screenshot-2.png!
*What's the reason ?*
scm check whether (container replicates num +
inflightReplication.get(containerId).size() -
inflightDeletion.get(containerId).size()) is less than 3. If less than 3, it
will ask some datanode to replicate the container, and add the action into
inflightReplication.get(containerId). The replicate action time out is 10
minutes, if action timeout, scm will delete the action from
inflightReplication.get(containerId) as the image shows. Then (container
replicates num + inflightReplication.get(containerId).size() -
inflightDeletion.get(containerId).size()) is less than 3 again, and scm ask
another datanode to replicate the container.
Because replicate container cost a long time, sometimes it cannot finish in 10
minutes, thus 31 datanodes has to replicate the container every 10 minutes. 19
of 31 datanodes replicate container from the same source datanode, it will
also cause big pressure on the source datanode and replicate container become
slower. Actually it cost 4 hours to finish the first replicate.
!screenshot-3.png!
> SCM ask 31 datanodes to replicate the same container
> ----------------------------------------------------
>
> Key: HDDS-3481
> URL: https://issues.apache.org/jira/browse/HDDS-3481
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: runzhiwang
> Assignee: runzhiwang
> Priority: Major
> Attachments: screenshot-1.png, screenshot-2.png, screenshot-3.png,
> screenshot-4.png
>
>
> *What's the problem ?*
> As the image shows, scm ask 31 datanodes to replicate container 2037 every
> 10 minutes from 2020-04-17 23:38:51. And at 2020-04-18 08:58:52 scm find the
> replicate num of container 2037 is 12, then it ask 11 datanodes to delete
> container 2037.
> !screenshot-1.png!
> !screenshot-2.png!
> *What's the reason ?*
> scm check whether (container replicates num +
> inflightReplication.get(containerId).size() -
> inflightDeletion.get(containerId).size()) is less than 3. If less than 3, it
> will ask some datanode to replicate the container, and add the action into
> inflightReplication.get(containerId). The replicate action time out is 10
> minutes, if action timeout, scm will delete the action from
> inflightReplication.get(containerId) as the image shows. Then (container
> replicates num + inflightReplication.get(containerId).size() -
> inflightDeletion.get(containerId).size()) is less than 3 again, and scm ask
> another datanode to replicate the container.
> Because replicate container cost a long time, sometimes it cannot finish in
> 10 minutes, thus 31 datanodes has to replicate the container every 10
> minutes. 19 of 31 datanodes replicate container from the same source
> datanode, it will also cause big pressure on the source datanode and
> replicate container become slower. Actually it cost 4 hours to finish the
> first replicate.
> !screenshot-4.png!
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