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https://issues.apache.org/jira/browse/HDFS-2093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HDFS-2093:
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Component/s: name-node
Description:
In fault-testing the HDFS-1073 branch, I saw the following situation:
- NN has two storage directories, but one is in failed state
- NN starts to roll edits logs to edits_inprogress_5160285
- NN then crashes
- on restart, it detects the truncated log, but since it has 0 txns, it
finalizes it to the nonsense log name edits_5160285-5160284.
- It then starts logs again at edits_inprogress_5160285.
- After this point, no checkpoints or future NN startups succeed since there
are two logs starting with the same txid
Affects Version/s: Edit log branch (HDFS-1073)
Fix Version/s: Edit log branch (HDFS-1073)
> 1073: Handle case where an entirely empty log is left during NN crash
> ---------------------------------------------------------------------
>
> Key: HDFS-2093
> URL: https://issues.apache.org/jira/browse/HDFS-2093
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Affects Versions: Edit log branch (HDFS-1073)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: Edit log branch (HDFS-1073)
>
>
> In fault-testing the HDFS-1073 branch, I saw the following situation:
> - NN has two storage directories, but one is in failed state
> - NN starts to roll edits logs to edits_inprogress_5160285
> - NN then crashes
> - on restart, it detects the truncated log, but since it has 0 txns, it
> finalizes it to the nonsense log name edits_5160285-5160284.
> - It then starts logs again at edits_inprogress_5160285.
> - After this point, no checkpoints or future NN startups succeed since there
> are two logs starting with the same txid
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