Add sanity checks during edits loading that generation stamps are non-decreasing
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Key: HDFS-2872
URL: https://issues.apache.org/jira/browse/HDFS-2872
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 1.0.0
Reporter: Todd Lipcon
In 0.23 and later versions, we have a txid per edit, and the loading process
verifies that there are no gaps. Lacking this in 1.0, we can use generation
stamps as a proxy - the OP_SET_GENERATION_STAMP opcode should never result in a
decreased genstamp. If it does, that would indicate that the edits are corrupt,
or older edits are being applied to a newer checkpoint, for example.
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