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https://issues.apache.org/jira/browse/HDFS-17218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17776157#comment-17776157
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ASF GitHub Bot commented on HDFS-17218:
---------------------------------------
ZanderXu commented on code in PR #6176:
URL: https://github.com/apache/hadoop/pull/6176#discussion_r1361950390
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeDescriptor.java:
##########
@@ -1007,6 +1013,7 @@ public void updateRegInfo(DatanodeID nodeReg) {
for(DatanodeStorageInfo storage : getStorageInfos()) {
if (storage.getStorageType() != StorageType.PROVIDED) {
storage.setBlockReportCount(0);
+ storage.setBlockContentsStale(true);
Review Comment:
> Actually, this situation can happen at any time, not just between
"registerDataNode" and "blockReport". Why do you think that after the DN is
re-registered, the probability of the above situation happening will increase,
and it needs to be dealt with specifically?
Yes, there are some other situations can cause this case. And I don't think
the probability of the above situation happening will increase.
I just think we have a chance to reduce this case. So I think we need to do
it.
> 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
> Labels: pull-request-available
> Attachments: image-2023-10-12-15-52-52-336.png
>
>
> 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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