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From "ikweesung (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5809) BlockPoolSliceScanner and high speed hdfs appending make datanode to drop into infinite loop
Date Sun, 01 Jun 2014 08:26:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14014938#comment-14014938
] 

ikweesung commented on HDFS-5809:
---------------------------------

Hi Colin Patrick McCabe.
Thank you for you take this one.  


> BlockPoolSliceScanner and high speed hdfs appending make datanode to drop into infinite
loop
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5809
>                 URL: https://issues.apache.org/jira/browse/HDFS-5809
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.0.0-alpha
>         Environment: jdk1.6, centos6.4, 2.0.0-cdh4.5.0
>            Reporter: ikweesung
>            Assignee: Colin Patrick McCabe
>            Priority: Critical
>              Labels: blockpoolslicescanner, datanode, infinite-loop
>         Attachments: HDFS-5809.001.patch
>
>
> Hello, everyone.
> When hadoop cluster starts, BlockPoolSliceScanner start scanning the blocks in my cluster.
> Then, randomly one datanode drop into infinite loop as the log show, and finally all
datanodes drop into infinite loop.
> Every datanode just verify fail by one block. 
> When i check the fail block like this : hadoop fsck / -files -blocks | grep blk_1223474551535936089_4702249,
no hdfs file contains the block.
> It seems that in while block of BlockPoolSliceScanner's scan method drop into infinite
loop .
> BlockPoolSliceScanner: 650
> while (datanode.shouldRun
> && !datanode.blockScanner.blockScannerThread.isInterrupted()
> && datanode.isBPServiceAlive(blockPoolId)) { ....
> The log finally printed in method verifyBlock(BlockPoolSliceScanner:453).
> Please excuse my poor English.
> -------------------------------------------------------------------------------------------------------------------------------------------------
> LOG: 
> 2014-01-21 18:36:50,582 INFO org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner:
Verification failed for BP-1040548460-58.229.158.13-1385606058039:blk_6833233229840997944_4702634
- may be due to race with write
> 2014-01-21 18:36:50,582 INFO org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner:
Verification failed for BP-1040548460-58.229.158.13-1385606058039:blk_6833233229840997944_4702634
- may be due to race with write
> 2014-01-21 18:36:50,582 INFO org.apache.hadoop.hdfs.server.datanode.BlockPoolSliceScanner:
Verification failed for BP-1040548460-58.229.158.13-1385606058039:blk_6833233229840997944_4702634
- may be due to race with write



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