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https://issues.apache.org/jira/browse/HDFS-13846?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16596832#comment-16596832
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Daniel Templeton commented on HDFS-13846:
-----------------------------------------
I see. That makes sense. Might be nice to add a comment to explain that so
that someone doesn't "fix" it later by making the conditional test {{<=}}.
Aside from that, LGTM. Did you look at the deprecation warning that popped up?
The jenkins build is gone now, so I can't verify whether it was related to
code you added.
> Safe blocks counter is not decremented correctly if the block is striped
> ------------------------------------------------------------------------
>
> Key: HDFS-13846
> URL: https://issues.apache.org/jira/browse/HDFS-13846
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 3.1.0
> Reporter: Kitti Nanasi
> Assignee: Kitti Nanasi
> Priority: Major
> Attachments: HDFS-13846.001.patch, HDFS-13846.002.patch,
> HDFS-13846.003.patch
>
>
> In BlockManagerSafeMode class, the "safe blocks" counter is incremented if
> the number of nodes containing the block equals to the number of data units
> specified by the erasure coding policy, which looks like this in the code:
> {code:java}
> final int safe = storedBlock.isStriped() ?
> ((BlockInfoStriped)storedBlock).getRealDataBlockNum() :
> safeReplication;
> if (storageNum == safe) {
> this.blockSafe++;
> {code}
> But when it is decremented the code does not check if the block is striped or
> not, just compares the number of nodes containing the block with 0
> (safeReplication - 1) if the block is complete, which is not correct.
> {code:java}
> if (storedBlock.isComplete() &&
> blockManager.countNodes(b).liveReplicas() == safeReplication - 1) {
> this.blockSafe--;
> assert blockSafe >= 0;
> checkSafeMode();
> }
> {code}
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