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https://issues.apache.org/jira/browse/HDFS-8224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15396598#comment-15396598
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Wei-Chiu Chuang commented on HDFS-8224:
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Hi [~shahrs87] thanks for bring up this discussion. What would be the relation
between this proposal versus HDFS-10627? In its current form, if
{{blockSender.sendPacket()}} gets a Connection Reset or Broken pipe, the block
is added to the scanning queue of VolumeScanner. So that would mean the block
is scanned twice if this case happens. Or we could move that piece of code to
the catch block of {{DataTransfer#run()}} to add the block into scanning queue
there.
> Any IOException in DataTransfer#run() will run diskError thread even if it is
> not disk error
> --------------------------------------------------------------------------------------------
>
> Key: HDFS-8224
> URL: https://issues.apache.org/jira/browse/HDFS-8224
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Rushabh S Shah
> Assignee: Rushabh S Shah
> Fix For: 2.8.0
>
>
> This happened in our 2.6 cluster.
> One of the block and its metadata file were corrupted.
> The disk was healthy in this case.
> Only the block was corrupt.
> Namenode tried to copy that block to another datanode but failed with the
> following stack trace:
> 2015-04-20 01:04:04,421
> [org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer@11319bc4] WARN
> datanode.DataNode: DatanodeRegistration(a.b.c.d,
> datanodeUuid=e8c5135c-9b9f-4d05-a59d-e5525518aca7, infoPort=1006,
> infoSecurePort=0, ipcPort=8020,
> storageInfo=lv=-56;cid=CID-e7f736ac-158e-446e-9091-7e66f3cddf3c;nsid=358250775;c=1428471998571):Failed
> to transfer BP-xxx-1351096255769:blk_2697560713_1107108863999 to
> a1.b1.c1.d1:1004 got
> java.io.IOException: Could not create DataChecksum of type 0 with
> bytesPerChecksum 0
> at
> org.apache.hadoop.util.DataChecksum.newDataChecksum(DataChecksum.java:125)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader.readHeader(BlockMetadataHeader.java:175)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader.readHeader(BlockMetadataHeader.java:140)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader.readDataChecksum(BlockMetadataHeader.java:102)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:287)
> at
> org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer.run(DataNode.java:1989)
> at java.lang.Thread.run(Thread.java:722)
> The following catch block in DataTransfer#run method will treat every
> IOException as disk error fault and run disk errror
> {noformat}
> catch (IOException ie) {
> LOG.warn(bpReg + ":Failed to transfer " + b + " to " +
> targets[0] + " got ", ie);
> // check if there are any disk problem
> checkDiskErrorAsync();
> }
> {noformat}
> This block was never scanned by BlockPoolSliceScanner otherwise it would have
> reported as corrupt block.
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