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https://issues.apache.org/jira/browse/HDFS-16764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17603302#comment-17603302
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ASF GitHub Bot commented on HDFS-16764:
---------------------------------------
ZanderXu commented on PR #4872:
URL: https://github.com/apache/hadoop/pull/4872#issuecomment-1244816866
> Apart from observers I think it can impact even when
`fs.ha.allow.stale.reads` is set to True
Yeah, it always impact even when `fs.ha.allow.stale.reads` is True.
The modification added by HDFS-4591. @atm Sir, do you have time to take a
look about this PR?
@jojochuang @goiri @Hexiaoqiao @ferhui Masters, can help me review this PR
too?
> ObserverNamenode handles addBlock rpc and throws a FileNotFoundException
> -------------------------------------------------------------------------
>
> Key: HDFS-16764
> URL: https://issues.apache.org/jira/browse/HDFS-16764
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Critical
> Labels: pull-request-available
>
> ObserverNameNode currently can handle the addBlockLocation RPC, but it may
> throw a FileNotFoundException when it contains stale txid.
> * AddBlock is not a coordinated method, so Observer will not check the
> statId.
> * AddBlock does the validation with checkOperation(OperationCategory.READ)
> So the observer can handle the addBlock rpc. If this observer cannot replay
> the edit of create file, it will throw a FileNotFoundException during doing
> validation.
> The related code as follows:
> {code:java}
> checkOperation(OperationCategory.READ);
> final FSPermissionChecker pc = getPermissionChecker();
> FSPermissionChecker.setOperationType(operationName);
> readLock();
> try {
> checkOperation(OperationCategory.READ);
> r = FSDirWriteFileOp.validateAddBlock(this, pc, src, fileId, clientName,
> previous, onRetryBlock);
> } finally {
> readUnlock(operationName);
> } {code}
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