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https://issues.apache.org/jira/browse/HDFS-16613?focusedWorklogId=780571&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-780571
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ASF GitHub Bot logged work on HDFS-16613:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 12/Jun/22 01:25
Start Date: 12/Jun/22 01:25
Worklog Time Spent: 10m
Work Description: hi-adachi commented on PR #4398:
URL: https://github.com/apache/hadoop/pull/4398#issuecomment-1153039075
@lfxy I think so too. The javadoc failure is filed as HDFS-16629 and the
failed test passed in my local.
Issue Time Tracking
-------------------
Worklog Id: (was: 780571)
Time Spent: 1h 40m (was: 1.5h)
> EC: Improve performance of decommissioning dn with many ec blocks
> -----------------------------------------------------------------
>
> Key: HDFS-16613
> URL: https://issues.apache.org/jira/browse/HDFS-16613
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: ec, erasure-coding, namenode
> Affects Versions: 3.4.0
> Reporter: caozhiqiang
> Assignee: caozhiqiang
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2022-06-07-11-46-42-389.png,
> image-2022-06-07-17-42-16-075.png, image-2022-06-07-17-45-45-316.png,
> image-2022-06-07-17-51-04-876.png, image-2022-06-07-17-55-40-203.png,
> image-2022-06-08-11-38-29-664.png, image-2022-06-08-11-41-11-127.png
>
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> In a hdfs cluster with a lot of EC blocks, decommission a dn is very slow.
> The reason is unlike replication blocks can be replicated from any dn which
> has the same block replication, the ec block have to be replicated from the
> decommissioning dn.
> The configurations dfs.namenode.replication.max-streams and
> dfs.namenode.replication.max-streams-hard-limit will limit the replication
> speed, but increase these configurations will create risk to the whole
> cluster's network. So it should add a new configuration to limit the
> decommissioning dn, distinguished from the cluster wide max-streams limit.
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