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https://issues.apache.org/jira/browse/HDFS-5809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13880702#comment-13880702
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ikweesung commented on HDFS-5809:
---------------------------------
My ugly path like this:
{code}
if ( info != null ) {
delBlockInfo(info);
} else if(blockInfoSet.contains(block)){
delBlockInfo(info);
info = new BlockScanInfo(block);
} else {
// It might already be removed. Thats ok, it will be caught next time.
info = new BlockScanInfo(block);
}
{code}
> BlockPoolSliceScanner 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
> Priority: Critical
> Labels: blockpoolslicescanner, datanode, infinite-loop
>
> 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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