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Posted to hdfs-issues@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2015/06/16 15:55:03 UTC
[jira] [Updated] (HDFS-4660) Block corruption can happen during
pipeline recovery
[ https://issues.apache.org/jira/browse/HDFS-4660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kihwal Lee updated HDFS-4660:
-----------------------------
Summary: Block corruption can happen during pipeline recovery (was: Duplicated checksum on DN in a recovered pipeline)
> Block corruption can happen during pipeline recovery
> ----------------------------------------------------
>
> Key: HDFS-4660
> URL: https://issues.apache.org/jira/browse/HDFS-4660
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 3.0.0, 2.0.3-alpha
> Reporter: Peng Zhang
> Assignee: Kihwal Lee
> Priority: Blocker
> Attachments: HDFS-4660.patch, HDFS-4660.patch, HDFS-4660.v2.patch
>
>
> pipeline DN1 DN2 DN3
> stop DN2
> pipeline added node DN4 located at 2nd position
> DN1 DN4 DN3
> recover RBW
> DN4 after recover rbw
> 2013-04-01 21:02:31,570 INFO org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl: Recover RBW replica BP-325305253-10.2.201.14-1364820083462:blk_-9076133543772600337_1004
> 2013-04-01 21:02:31,570 INFO org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl: Recovering ReplicaBeingWritten, blk_-9076133543772600337_1004, RBW
> getNumBytes() = 134144
> getBytesOnDisk() = 134144
> getVisibleLength()= 134144
> end at chunk (134144/512=262)
> DN3 after recover rbw
> 2013-04-01 21:02:31,575 INFO org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl: Recover RBW replica BP-325305253-10.2.201.14-1364820083462:blk_-9076133543772600337_10042013-04-01 21:02:31,575 INFO org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl: Recovering ReplicaBeingWritten, blk_-9076133543772600337_1004, RBW
> getNumBytes() = 134028
> getBytesOnDisk() = 134028
> getVisibleLength()= 134028
> client send packet after recover pipeline
> offset=133632 len=1008
> DN4 after flush
> 2013-04-01 21:02:31,779 DEBUG org.apache.hadoop.hdfs.server.datanode.DataNode: FlushOrsync, file offset:134640; meta offset:1063
> // meta end position should be floor(134640/512)*4 + 7 == 1059, but now it is 1063.
> DN3 after flush
> 2013-04-01 21:02:31,782 DEBUG org.apache.hadoop.hdfs.server.datanode.DataNode: PacketResponder: BP-325305253-10.2.201.14-1364820083462:blk_-9076133543772600337_1005, type=LAST_IN_PIPELINE, downstreams=0:[]: enqueue Packet(seqno=219, lastPacketInBlock=false, offsetInBlock=134640, ackEnqueueNanoTime=8817026136871545)
> 2013-04-01 21:02:31,782 DEBUG org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl: Changing meta file offset of block BP-325305253-10.2.201.14-1364820083462:blk_-9076133543772600337_1005 from 1055 to 1051
> 2013-04-01 21:02:31,782 DEBUG org.apache.hadoop.hdfs.server.datanode.DataNode: FlushOrsync, file offset:134640; meta offset:1059
> After checking meta on DN4, I found checksum of chunk 262 is duplicated, but data not.
> Later after block was finalized, DN4's scanner detected bad block, and then reported it to NM. NM send a command to delete this block, and replicate this block from other DN in pipeline to satisfy duplication num.
> I think this is because in BlockReceiver it skips data bytes already written, but not skips checksum bytes already written. And function adjustCrcFilePosition is only used for last non-completed chunk, but
> not for this situation.
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