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https://issues.apache.org/jira/browse/HDFS-17906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18073659#comment-18073659
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ASF GitHub Bot commented on HDFS-17906:
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pan3793 commented on PR #8416:
URL: https://github.com/apache/hadoop/pull/8416#issuecomment-4249592859
@Hexiaoqiao, this is a bug fix, do we need to backport it to branch-3.5 and
branch-3.4? HDFS rolling upgrade is quite an important case
> Fix issue that DataNodes get stuck in infinite loop when meet
> InvalidBlockReportLeaseException
> ----------------------------------------------------------------------------------------------
>
> Key: HDFS-17906
> URL: https://issues.apache.org/jira/browse/HDFS-17906
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: dzcxzl
> Assignee: dzcxzl
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.6.0
>
>
>
> HDFS-16942 introduced `InvalidBlockReportLeaseException`, which the NameNode
> now throws back to the DataNode via RPC when a block report is rejected due
> to an invalid lease. On a DataNode that also includes HDFS-16942, the
> exception is caught and `fullBlockReportLeaseId` is reset to 0, allowing the
> DN to request a new lease on the next heartbeat and retry.
> However, during a rolling upgrade where the NameNode has been upgraded (with
> HDFS-16942) but DataNodes are still running an older version (without
> HDFS-16942), the old DataNode code does not have the
> `InvalidBlockReportLeaseException` handling branch in
> `BPServiceActor.offerService()`. This causes the DN to enter an infinite
> failure loop where it can never successfully send a full block report.
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