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HDFS-17821. Fix the SNN repeatedly checkpoint after fsimage transfer failure on one of the multiple NNs #7876

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HDFS-17821. Fix the SNN repeatedly checkpoint after fsimage transfer failure on one of the multiple NNs #7876

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@lfxy lfxy commented Aug 16, 2025

In our cluster with observer NNs, when the standby NN is doing a checkpoint and sending the fsimage to other NNs, if the sending fails of one NN due to network anomalies, NN restarts, or other exceptions, the standby will consider this Checkpoint as failed and does not update the lastCheckpointTime, and retry checkpoints.
However, the active or observer NNs which successfully received the fsimage has update their lastCheckpointTime, and the NN which receive fsimage failed don't update its lastCheckpointTime, resulting in inconsistent lastCheckpointTime across the NNs. This causes subsequent checkpoints to repeatedly fail to send fsimage to part or all active or observer NNs, because they do not satisfy the DFS_NAMENODE_CHECKPOINT_PERIOD_KEY condition.
Then the SNN will always failed to do checkpoint and repeat retry. I think that the SNN should consider the checkpoint successful and update its lastCheckpointTime if the fsimage transmission succeeds on at least half of the NNs.

@lfxy lfxy force-pushed the feature/HDFS-17821 branch from 3bf0ae1 to 867b137 Compare August 17, 2025 15:20
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lfxy commented Aug 29, 2025

@tomscut @Hexiaoqiao Hi, could you help to review this issue?
Currently, in a cluster with observers, SNN needs to upload fsimage to multiple NNs. If one of the uploads fails, SNN will repeatedly checkpoint and fail because the lastCheckpointTime of different NNs is inconsistent. Thank you.

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We verified this change in production and it worked fine. The change looks good to me.

@lfxy lfxy force-pushed the feature/HDFS-17821 branch from 867b137 to 53b528b Compare October 11, 2025 07:00
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