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https://issues.apache.org/jira/browse/HDFS-15901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18042653#comment-18042653
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ASF GitHub Bot commented on HDFS-15901:
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github-actions[bot] closed pull request #2782: HDFS-15901.Solve the problem of
DN repeated block reports occupying too many RPCs during Safemode.
URL: https://github.com/apache/hadoop/pull/2782
> Solve the problem of DN repeated block reports occupying too many RPCs during
> Safemode
> --------------------------------------------------------------------------------------
>
> Key: HDFS-15901
> URL: https://issues.apache.org/jira/browse/HDFS-15901
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: JiangHua Zhu
> Assignee: JiangHua Zhu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> When the cluster exceeds thousands of nodes, we want to restart the NameNode
> service, and all DataNodes send a full Block action to the NameNode. During
> SafeMode, some DataNodes may send blocks to NameNode multiple times, which
> will take up too much RPC. In fact, this is unnecessary.
> In this case, some block report leases will fail or time out, and in extreme
> cases, the NameNode will always stay in Safe Mode.
> 2021-03-14 08:16:25,873 [78438700] - INFO [Block report
> processor:BlockManager@2158] - BLOCK* processReport 0xexxxxxxxx: discarded
> non-initial block report from DatanodeRegistration(xxxxxxxx:port,
> datanodeUuid=xxxxxxxx, infoPort=xxxxxxxx, infoSecurePort=xxxxxxxx,
> ipcPort=xxxxxxxx, storageInfo=lv=xxxxxxxx;nsid=xxxxxxxx;c=0) because namenode
> still in startup phase
> 2021-03-14 08:16:31,521 [78444348] - INFO [Block report
> processor:BlockManager@2158] - BLOCK* processReport 0xexxxxxxxx: discarded
> non-initial block report from DatanodeRegistration(xxxxxxxx,
> datanodeUuid=xxxxxxxx, infoPort=xxxxxxxx, infoSecurePort=xxxxxxxx,
> ipcPort=xxxxxxxx, storageInfo=lv=xxxxxxxx;nsid=xxxxxxxx;c=0) because namenode
> still in startup phase
> 2021-03-13 18:35:38,200 [29191027] - WARN [Block report
> processor:BlockReportLeaseManager@311] - BR lease 0xxxxxxxxx is not valid for
> DN xxxxxxxx, because the DN is not in the pending set.
> 2021-03-13 18:36:08,143 [29220970] - WARN [Block report
> processor:BlockReportLeaseManager@311] - BR lease 0xxxxxxxxx is not valid for
> DN xxxxxxxx, because the DN is not in the pending set.
> 2021-03-13 18:36:08,143 [29220970] - WARN [Block report
> processor:BlockReportLeaseManager@317] - BR lease 0xxxxxxxxx is not valid for
> DN xxxxxxxx, because the lease has expired.
> 2021-03-13 18:36:08,145 [29220972] - WARN [Block report
> processor:BlockReportLeaseManager@317] - BR lease 0xxxxxxxxx is not valid for
> DN xxxxxxxx, because the lease has expired.
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