Jing Zhao created HDFS-5999:
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Summary: Do not create rollback fsimage when it already exists
Key: HDFS-5999
URL: https://issues.apache.org/jira/browse/HDFS-5999
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jing Zhao
Assignee: Jing Zhao
Currently in FSEditLogLoader#applyEditLogOp, if the op is OP_START_LOG_SEGMENT,
we do an extra rollback fsimage with condition "totalEdits > 1".
This may cause some issue when we restart a NN with new software. If there is
no extra checkpoint after the rollback image, the NN may generate a new
rollback image using the new software, and replace the old rollback image. Then
later if we want to do rollback the NN, which uses the old software, may not be
able to load the rollback image.
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