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https://issues.apache.org/jira/browse/HDFS-3931?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Isaacson updated HDFS-3931:
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Attachment: hdfs3931-1.txt
Proposed, hackish, fix in three parts:
* set DFS_NAMENODE_REPLICATION_PENDING_TIMEOUT_SEC to 5 seconds
* increase delay in waitReplication so pending replication timeouts have more
than one chance to kick in
* when attempting to corrupt blocks, if the blockscanner beats us in the race,
retry.
In my testing with these changes, I had just one failure in 100 iterations.
> TestDatanodeBlockScanner#testBlockCorruptionPolicy2 is broken
> -------------------------------------------------------------
>
> Key: HDFS-3931
> URL: https://issues.apache.org/jira/browse/HDFS-3931
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: test
> Affects Versions: 2.0.0-alpha
> Reporter: Eli Collins
> Assignee: Andy Isaacson
> Attachments: hdfs3931-1.txt, hdfs3931.txt
>
>
> Per Andy's comment on HDFS-3902:
> TestDatanodeBlockScanner still fails about 1/5 runs in
> testBlockCorruptionRecoveryPolicy2. That's due to a separate test issue also
> uncovered by HDFS-3828.
> The failure scenario for this one is a bit more tricky. I think I've captured
> the scenario below:
> - The test corrupts 2/3 replicas.
> - client reports a bad block.
> - NN asks a DN to re-replicate, and randomly picks the other corrupt replica.
> - DN notices the incoming replica is corrupt and reports it as a bad block,
> but does not inform the NN that re-replication failed.
> - NN keeps the block on pendingReplications.
> - BP scanner wakes up on both DNs with corrupt blocks, both report
> corruption. NN reports both as duplicates, one from the client and one from
> the DN report above.
> since block is on pendingReplications, NN does not schedule another
> replication.
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