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https://issues.apache.org/jira/browse/HDFS-17071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17740929#comment-17740929
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farmmamba commented on HDFS-17071:
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[~hexiaoqiao] Sir, I have closed Github PR. Thanks for your suggestion~
> Erasure coding: delete duplicated ec block with same block group id on one
> datanode.
> ------------------------------------------------------------------------------------
>
> Key: HDFS-17071
> URL: https://issues.apache.org/jira/browse/HDFS-17071
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: farmmamba
> Assignee: farmmamba
> Priority: Major
> Labels: pull-request-available
>
> Currently, I found a strange phenomenon mentioned in HDFS-17047.
> When triggered FBR manually or automatically, we found some warn log like
> below:
> {code:java}
> 2023-06-14 16:29:36,432 WARN BlockStateChange: BLOCK* addStoredBlock: block
> blk_-9223372036578646784_59354864 moved to storageType DISK on node
> datanode12:50010
> 2023-06-14 16:29:36,477 WARN BlockStateChange: BLOCK* addStoredBlock: block
> blk_-9223372036578646784_59354864 moved to storageType DISK on node
> datanode12:50010{code}
> The above logs print the same storedBlock two times. After diving into logs,
> I found that there exist two blocks of a same block group due to some unknown
> reasons. And one of the two blocks is also exists in other datanode. But fsck
> did not print the duplicated replicas info.
> additional information： the file is 3MB+, we use RS-6-3-1024K, so the fsck
> only print seven blocks information. But indeed, we have eight blocks and one
> of them is a duplicated block.
>
> The reason why print above logs is that:
> In BlockManager#addStoredBlock method, because a datanode has two blocks of
> the same block group, the AddBlockResult would be REPLACED.
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