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https://issues.apache.org/jira/browse/HDFS-17218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17773525#comment-17773525
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Haiyang Hu edited comment on HDFS-17218 at 10/10/23 3:59 AM:
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Sure, attach code snippet that shows the current implements :
{quote}
6. dn restarts will FBR is executed (processFirstBlockReport will not be
executed here, processReport will be executed). since block1 is not a new
block, the processExtraRedundancy logic will not be executed.
{quote}
https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java#L2916-L2946
was (Author: haiyang hu):
Sure, attach code snippet that shows the current implements :
{noformat}
6. dn restarts will FBR is executed (processFirstBlockReport will not be
executed here, processReport will be executed). since block1 is not a new
block, the processExtraRedundancy logic will not be executed.
{noformat}
https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java#L2916-L2946
> NameNode should remove its excess blocks from the ExcessRedundancyMap When a
> DN registers
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-17218
> URL: https://issues.apache.org/jira/browse/HDFS-17218
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namanode
> Reporter: Haiyang Hu
> Assignee: Haiyang Hu
> Priority: Major
>
> Currently found that DN will lose all pending DNA_INVALIDATE blocks if it
> restarts.
> *Root case*
> Current DN enables asynchronously deletion, it have many pending deletion
> blocks in memory.
> when DN restarts, these cached blocks may be lost. it causes some blocks in
> the excess map in the namenode to be leaked and this will result in many
> blocks having more replicas then expected.
> *solution*
> Consider NameNode should remove its excess blocks from the
> ExcessRedundancyMap When a DN registers,
> this approach will ensure that when processing the DN's full block report,
> the 'processExtraRedundancy' can be performed according to the actual of the
> blocks.
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