Kihwal Lee created HDFS-9678:
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Summary: Standby NN sometimes does not clear needRollbackFsImage
Key: HDFS-9678
URL: https://issues.apache.org/jira/browse/HDFS-9678
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
When the edit log loader sees {{OP_ROLLING_UPGRADE_START}}, it calls
{{setNeedRollbackFsImage(true)}}. This is cleared on a standby NN only by the
checkpointer thread when it actually creates a rollback image.
On {{OP_ROLLING_UPGRADE_FINALIZE}}, the rolling upgrade is finalized, but
{{needRollbackFsImage}} is not cleared, if a rollback image was never created.
This result in perpetual checkpointing by the standby NN.
The standby NN thinks it needs to do chekpointing because it needs to create a
rollback image, but since it is not in upgrade mode, it creates a regular
checkpoint, not a rollback image. As a result, the status is not cleared even
after creating checkpoint.
The standby will keep checkpointing back-to-back and they will get uploaded to
the active constantly. We noticed this because of increased sync time on the
active.
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