[
https://issues.apache.org/jira/browse/HDFS-17052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17737993#comment-17737993
]
ASF GitHub Bot commented on HDFS-17052:
---------------------------------------
zhtttylz commented on PR #5759:
URL: https://github.com/apache/hadoop/pull/5759#issuecomment-1610902447
> > Thanks to involve me here. Skim the PR (seem very common logic), I am
wonder if this issue is only related with EC feature? or will it also impact on
replication scenario?
>
> @Hexiaoqiao The problem solved by this PR is only related to
`BlockPlacementPolicyRackFaultTolerant`.
`BlockPlacementPolicyRackFaultTolerant` has implemented a placement policy that
ensures each replica to be placed on a different rack. By default, EC files use
this policy. Replicated files can also use it if really desired.
> Erasure coding reconstruction failed when num of storageType rack NOT enough
> ----------------------------------------------------------------------------
>
> Key: HDFS-17052
> URL: https://issues.apache.org/jira/browse/HDFS-17052
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ec
> Affects Versions: 3.4.0
> Reporter: Hualong Zhang
> Assignee: Hualong Zhang
> Priority: Major
> Labels: pull-request-available
> Attachments: failed reconstruction ec in same rack-1.png, write ec in
> same rack.png
>
>
> When writing EC data, if the number of racks matching the storageType is
> insufficient, more than one block are allowed to be written to the same rack
> !write ec in same rack.png|width=962,height=604!
>
>
>
> However, during EC block recovery, it is not possible to recover on the same
> rack, which deviates from the expected behavior.
> !failed reconstruction ec in same rack-1.png|width=946,height=413!
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
