[
https://issues.apache.org/jira/browse/HDFS-14852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16992474#comment-16992474
]
Stephen O'Donnell commented on HDFS-14852:
------------------------------------------
I think that we should try to delete from all queues when the block is not
found at the passed in LEVEL.
For deletes, as it passes level as "LowRedundancyBlocks.LEVEL", it would
therefore always attempt to delete from all queues as it does not check a
specific level at all.
We should see if [~kihwal] agrees with this approach too, as he previously
suggested a different approach.
> Remove of LowRedundancyBlocks do NOT remove the block from all queues
> ---------------------------------------------------------------------
>
> Key: HDFS-14852
> URL: https://issues.apache.org/jira/browse/HDFS-14852
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.2.0, 3.0.3, 3.1.2, 3.3.0
> Reporter: Fei Hui
> Assignee: Fei Hui
> Priority: Major
> Attachments: CorruptBlocksMismatch.png, HDFS-14852.001.patch,
> HDFS-14852.002.patch, HDFS-14852.003.patch, HDFS-14852.004.patch,
> HDFS-14852.005.patch, screenshot-1.png
>
>
> LowRedundancyBlocks.java
> {code:java}
> // Some comments here
> if(priLevel >= 0 && priLevel < LEVEL
> && priorityQueues.get(priLevel).remove(block)) {
> NameNode.blockStateChangeLog.debug(
> "BLOCK* NameSystem.LowRedundancyBlock.remove: Removing block {}"
> + " from priority queue {}",
> block, priLevel);
> decrementBlockStat(block, priLevel, oldExpectedReplicas);
> return true;
> } else {
> // Try to remove the block from all queues if the block was
> // not found in the queue for the given priority level.
> for (int i = 0; i < LEVEL; i++) {
> if (i != priLevel && priorityQueues.get(i).remove(block)) {
> NameNode.blockStateChangeLog.debug(
> "BLOCK* NameSystem.LowRedundancyBlock.remove: Removing block" +
> " {} from priority queue {}", block, i);
> decrementBlockStat(block, i, oldExpectedReplicas);
> return true;
> }
> }
> }
> return false;
> }
> {code}
> Source code is above, the comments as follow
> {quote}
> // Try to remove the block from all queues if the block was
> // not found in the queue for the given priority level.
> {quote}
> The function "remove" does NOT remove the block from all queues.
> Function add from LowRedundancyBlocks.java is used on some places and maybe
> one block in two or more queues.
> We found that corrupt blocks mismatch corrupt files on NN web UI. Maybe it is
> related to this.
> Upload initial patch
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
