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https://issues.apache.org/jira/browse/HDFS-17815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDFS-17815:
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Labels: pull-request-available (was: )
> Fix upload fsimage failure when checkpoint takes a long time
> ------------------------------------------------------------
>
> Key: HDFS-17815
> URL: https://issues.apache.org/jira/browse/HDFS-17815
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.5.0
> Reporter: caozhiqiang
> Assignee: caozhiqiang
> Priority: Major
> Labels: pull-request-available
>
> The capacity of Our hdfs federation cluster are more then 500 PB, with one NS
> containing over 600 million files. Once checkpoint takes nearly two hours.
> We discover checkpoint frequently failures due to fail to put the fsimage to
> the active Namenode, leading to repeat checkpoints. We configured
> dfs.recent.image.check.enabled=true. After debug, the reason is the standby
> NN updates the lastCheckpointTime use the start time of checkpoint, rather
> than the end time. In our cluster, the lastCheckpointTime of the standby node
> is approximately 80 minutes ahead of the lastCheckpointTime of the active NN.
> When the checkpoint interval in standby NN exceeds
> dfs.namenode.checkpoint.period, the next checkpoint is performed. Because the
> active NN's lastCheckpointTime is later than standby NN's, the interval is
> less than dfs.namenode.checkpoint.period, and the putting fsimage is been
> rejected, causing the checkpoint to fail and retried.
> ANN's log:
> {code:java}
> 2025-07-31 07:14:29,845 INFO [qtp231311211-8404]
> org.apache.hadoop.hdfs.server.namenode.ImageServlet: New txnid cnt is
> 126487459, expecting at least 300000000. now is 1753917269845,
> lastCheckpointTime is 1753875142580, timeDelta is 42127, expecting period at
> least 43200 unless too long since last upload.. {code}
> SNN's log:
> {code:java}
> last checkpoint start time:
> 2025-07-30 18:13:08,729 INFO [Standby State Checkpointer]
> org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer: Triggering
> checkpoint because it has been 48047 seconds since the last checkpoint, which
> exceeds the configured interval 43200
> last checkpoint end timeļ¼
> 2025-07-30 20:11:51,330 INFO [Standby State Checkpointer]
> org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer: Checkpoint
> finished successfully.
> this time checkpoint start time:
> 2025-07-31 06:13:51,681 INFO [Standby State Checkpointer]
> org.apache.hadoop.hdfs.server.namenode.ha.StandbyCheckpointer: Triggering
> checkpoint because it has been 43242 seconds since the last checkpoint, which
> exceeds the configured interval 43200{code}
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