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https://issues.apache.org/jira/browse/HDFS-11056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15633249#comment-15633249
]
Kihwal Lee commented on HDFS-11056:
-----------------------------------
I was looking at the patch since yesterday. It looks like the partial chunk sum
is loaded from disk and saved in memory before it is modified. That seems like
a correct approach. +1
> Concurrent append and read operations lead to checksum error
> ------------------------------------------------------------
>
> Key: HDFS-11056
> URL: https://issues.apache.org/jira/browse/HDFS-11056
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode, httpfs
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Attachments: HDFS-11056.001.patch, HDFS-11056.002.patch,
> HDFS-11056.reproduce.patch
>
>
> If there are two clients, one of them open-append-close a file continuously,
> while the other open-read-close the same file continuously, the reader
> eventually gets a checksum error in the data read.
> On my local Mac, it takes a few minutes to produce the error. This happens to
> httpfs clients, but there's no reason not believe this happens to any append
> clients.
> I have a unit test that demonstrates the checksum error. Will attach later.
> Relevant log:
> {quote}
> 2016-10-25 15:34:45,153 INFO audit - allowed=true ugi=weichiu
> (auth:SIMPLE) ip=/127.0.0.1 cmd=open src=/tmp/bar.txt
> dst=null perm=null proto=rpc
> 2016-10-25 15:34:45,155 INFO DataNode - Receiving
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 src:
> /127.0.0.1:51130 dest: /127.0.0.1:50131
> 2016-10-25 15:34:45,155 INFO FsDatasetImpl - Appending to FinalizedReplica,
> blk_1073741825_1182, FINALIZED
> getNumBytes() = 182
> getBytesOnDisk() = 182
> getVisibleLength()= 182
> getVolume() =
> /Users/weichiu/sandbox/hadoop/hadoop-hdfs-project/hadoop-hdfs-httpfs/target/test-dir/dfs/data/data1
> getBlockURI() =
> file:/Users/weichiu/sandbox/hadoop/hadoop-hdfs-project/hadoop-hdfs-httpfs/target/test-dir/dfs/data/data1/current/BP-837130339-172.16.1.88-1477434851452/current/finalized/subdir0/subdir0/blk_1073741825
> 2016-10-25 15:34:45,167 INFO DataNode - opReadBlock
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 received exception
> java.io.IOException: No data exists for block
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182
> 2016-10-25 15:34:45,167 WARN DataNode -
> DatanodeRegistration(127.0.0.1:50131,
> datanodeUuid=41c96335-5e4b-4950-ac22-3d21b353abb8, infoPort=50133,
> infoSecurePort=0, ipcPort=50134,
> storageInfo=lv=-57;cid=testClusterID;nsid=1472068852;c=1477434851452):Got
> exception while serving
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 to /127.0.0.1:51121
> java.io.IOException: No data exists for block
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getBlockInputStream(FsDatasetImpl.java:773)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:400)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:581)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:150)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:102)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:289)
> at java.lang.Thread.run(Thread.java:745)
> 2016-10-25 15:34:45,168 INFO FSNamesystem -
> updatePipeline(blk_1073741825_1182, newGS=1183, newLength=182,
> newNodes=[127.0.0.1:50131], client=DFSClient_NONMAPREDUCE_-1743096965_197)
> 2016-10-25 15:34:45,168 ERROR DataNode - 127.0.0.1:50131:DataXceiver error
> processing READ_BLOCK operation src: /127.0.0.1:51121 dst: /127.0.0.1:50131
> java.io.IOException: No data exists for block
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182
> at
> org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.getBlockInputStream(FsDatasetImpl.java:773)
> at
> org.apache.hadoop.hdfs.server.datanode.BlockSender.<init>(BlockSender.java:400)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.readBlock(DataXceiver.java:581)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opReadBlock(Receiver.java:150)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:102)
> at
> org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:289)
> at java.lang.Thread.run(Thread.java:745)
> 2016-10-25 15:34:45,168 INFO FSNamesystem -
> updatePipeline(blk_1073741825_1182 => blk_1073741825_1183) success
> 2016-10-25 15:34:45,170 WARN DFSClient - Found Checksum error for
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 from
> DatanodeInfoWithStorage[127.0.0.1:50131,DS-a1878418-4f7f-4fc9-b3f7-d7ed780b5373,DISK]
> at 0
> 2016-10-25 15:34:45,170 WARN DFSClient - No live nodes contain block
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 after checking
> nodes =
> [DatanodeInfoWithStorage[127.0.0.1:50131,DS-a1878418-4f7f-4fc9-b3f7-d7ed780b5373,DISK]],
> ignoredNodes = null
> 2016-10-25 15:34:45,170 INFO DFSClient - Could not obtain
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 from any node: No
> live nodes contain current block Block locations:
> DatanodeInfoWithStorage[127.0.0.1:50131,DS-a1878418-4f7f-4fc9-b3f7-d7ed780b5373,DISK]
> Dead nodes:
> DatanodeInfoWithStorage[127.0.0.1:50131,DS-a1878418-4f7f-4fc9-b3f7-d7ed780b5373,DISK].
> Will get new block locations from namenode and retry...
> 2016-10-25 15:34:45,170 WARN DFSClient - DFS chooseDataNode: got # 1
> IOException, will wait for 981.8085941094539 msec.
> 2016-10-25 15:34:45,171 INFO clienttrace - src: /127.0.0.1:51130, dest:
> /127.0.0.1:50131, bytes: 183, op: HDFS_WRITE, cliID:
> DFSClient_NONMAPREDUCE_-1743096965_197, offset: 0, srvID:
> 41c96335-5e4b-4950-ac22-3d21b353abb8, blockid:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1183, duration: 2175363
> 2016-10-25 15:34:45,171 INFO DataNode - PacketResponder:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1183,
> type=LAST_IN_PIPELINE terminating
> 2016-10-25 15:34:45,172 INFO FSNamesystem - BLOCK* blk_1073741825_1183 is
> COMMITTED but not COMPLETE(numNodes= 0 < minimum = 1) in file /tmp/bar.txt
> 2016-10-25 15:34:45,576 INFO StateChange - DIR* completeFile: /tmp/bar.txt
> is closed by DFSClient_NONMAPREDUCE_-1743096965_197
> 2016-10-25 15:34:45,577 INFO httpfsaudit - [/tmp/bar.txt]
> 2016-10-25 15:34:45,579 INFO AppendTestUtil - seed=-3144873070946578911,
> size=1
> 2016-10-25 15:34:45,590 INFO audit - allowed=true ugi=weichiu
> (auth:PROXY) via weichiu (auth:SIMPLE) ip=/127.0.0.1 cmd=append
> src=/tmp/bar.txt dst=null perm=null proto=rpc
> 2016-10-25 15:34:45,593 INFO DataNode - Receiving
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1183 src:
> /127.0.0.1:51132 dest: /127.0.0.1:50131
> 2016-10-25 15:34:45,593 INFO FsDatasetImpl - Appending to FinalizedReplica,
> blk_1073741825_1183, FINALIZED
> getNumBytes() = 183
> getBytesOnDisk() = 183
> getVisibleLength()= 183
> getVolume() =
> /Users/weichiu/sandbox/hadoop/hadoop-hdfs-project/hadoop-hdfs-httpfs/target/test-dir/dfs/data/data1
> getBlockURI() =
> file:/Users/weichiu/sandbox/hadoop/hadoop-hdfs-project/hadoop-hdfs-httpfs/target/test-dir/dfs/data/data1/current/BP-837130339-172.16.1.88-1477434851452/current/finalized/subdir0/subdir0/blk_1073741825
> 2016-10-25 15:34:45,603 INFO FSNamesystem -
> updatePipeline(blk_1073741825_1183, newGS=1184, newLength=183,
> newNodes=[127.0.0.1:50131], client=DFSClient_NONMAPREDUCE_-1743096965_197)
> 2016-10-25 15:34:45,603 INFO FSNamesystem -
> updatePipeline(blk_1073741825_1183 => blk_1073741825_1184) success
> 2016-10-25 15:34:45,605 INFO clienttrace - src: /127.0.0.1:51132, dest:
> /127.0.0.1:50131, bytes: 184, op: HDFS_WRITE, cliID:
> DFSClient_NONMAPREDUCE_-1743096965_197, offset: 0, srvID:
> 41c96335-5e4b-4950-ac22-3d21b353abb8, blockid:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1184, duration: 1377229
> 2016-10-25 15:34:45,605 INFO DataNode - PacketResponder:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1184,
> type=LAST_IN_PIPELINE terminating
> 2016-10-25 15:34:45,606 INFO FSNamesystem - BLOCK* blk_1073741825_1184 is
> COMMITTED but not COMPLETE(numNodes= 0 < minimum = 1) in file /tmp/bar.txt
> 2016-10-25 15:34:46,009 INFO StateChange - DIR* completeFile: /tmp/bar.txt
> is closed by DFSClient_NONMAPREDUCE_-1743096965_197
> 2016-10-25 15:34:46,010 INFO httpfsaudit - [/tmp/bar.txt]
> 2016-10-25 15:34:46,012 INFO AppendTestUtil - seed=-263001291976323720,
> size=1
> 2016-10-25 15:34:46,022 INFO audit - allowed=true ugi=weichiu
> (auth:PROXY) via weichiu (auth:SIMPLE) ip=/127.0.0.1 cmd=append
> src=/tmp/bar.txt dst=null perm=null proto=rpc
> 2016-10-25 15:34:46,024 INFO DataNode - Receiving
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1184 src:
> /127.0.0.1:51133 dest: /127.0.0.1:50131
> 2016-10-25 15:34:46,024 INFO FsDatasetImpl - Appending to FinalizedReplica,
> blk_1073741825_1184, FINALIZED
> getNumBytes() = 184
> getBytesOnDisk() = 184
> getVisibleLength()= 184
> getVolume() =
> /Users/weichiu/sandbox/hadoop/hadoop-hdfs-project/hadoop-hdfs-httpfs/target/test-dir/dfs/data/data1
> getBlockURI() =
> file:/Users/weichiu/sandbox/hadoop/hadoop-hdfs-project/hadoop-hdfs-httpfs/target/test-dir/dfs/data/data1/current/BP-837130339-172.16.1.88-1477434851452/current/finalized/subdir0/subdir0/blk_1073741825
> 2016-10-25 15:34:46,032 INFO FSNamesystem -
> updatePipeline(blk_1073741825_1184, newGS=1185, newLength=184,
> newNodes=[127.0.0.1:50131], client=DFSClient_NONMAPREDUCE_-1743096965_197)
> 2016-10-25 15:34:46,032 INFO FSNamesystem -
> updatePipeline(blk_1073741825_1184 => blk_1073741825_1185) success
> 2016-10-25 15:34:46,033 INFO clienttrace - src: /127.0.0.1:51133, dest:
> /127.0.0.1:50131, bytes: 185, op: HDFS_WRITE, cliID:
> DFSClient_NONMAPREDUCE_-1743096965_197, offset: 0, srvID:
> 41c96335-5e4b-4950-ac22-3d21b353abb8, blockid:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1185, duration: 1112564
> 2016-10-25 15:34:46,033 INFO DataNode - PacketResponder:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1185,
> type=LAST_IN_PIPELINE terminating
> 2016-10-25 15:34:46,033 INFO FSNamesystem - BLOCK* blk_1073741825_1185 is
> COMMITTED but not COMPLETE(numNodes= 0 < minimum = 1) in file /tmp/bar.txt
> 2016-10-25 15:34:46,156 INFO audit - allowed=true ugi=weichiu
> (auth:SIMPLE) ip=/127.0.0.1 cmd=open src=/tmp/bar.txt
> dst=null perm=null proto=rpc
> 2016-10-25 15:34:46,158 INFO StateChange - *DIR* reportBadBlocks for block:
> BP-837130339-172.16.1.88-1477434851452:blk_1073741825_1182 on datanode:
> 127.0.0.1:50131
> Exception in thread "Thread-144" java.lang.RuntimeException:
> org.apache.hadoop.fs.ChecksumException: Checksum CRC32C not matched for file
> /tmp/bar.txt at position 0: expected=C893FEDE but computed=69322F90,
> algorithm=PureJavaCrc32C
> at
> org.apache.hadoop.fs.http.client.BaseTestHttpFSWith$1ReaderRunnable.run(BaseTestHttpFSWith.java:309)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.hadoop.fs.ChecksumException: Checksum CRC32C not
> matched for file /tmp/bar.txt at position 0: expected=C893FEDE but
> computed=69322F90, algorithm=PureJavaCrc32C
> at
> org.apache.hadoop.util.DataChecksum.throwChecksumException(DataChecksum.java:407)
> at
> org.apache.hadoop.util.DataChecksum.verifyChunked(DataChecksum.java:351)
> at
> org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:311)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.readNextPacket(BlockReaderRemote.java:216)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.read(BlockReaderRemote.java:144)
> at
> org.apache.hadoop.hdfs.ByteArrayStrategy.readFromBlock(ReaderStrategy.java:119)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:704)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:765)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:814)
> at java.io.DataInputStream.read(DataInputStream.java:149)
> at
> org.apache.hadoop.fs.http.client.BaseTestHttpFSWith$1ReaderRunnable.run(BaseTestHttpFSWith.java:302)
> ... 1 more
> 2016-10-25 15:34:46,437 INFO StateChange - DIR* completeFile: /tmp/bar.txt
> is closed by DFSClient_NONMAPREDUCE_-1743096965_197
> 2016-10-25 15:34:46,437 INFO httpfsaudit - [/tmp/bar.txt]
> 2016-10-25 15:34:46,440 INFO AppendTestUtil - seed=8756761565208093670,
> size=1
> 2016-10-25 15:34:46,450 WARN StateChange - DIR* NameSystem.append: append:
> lastBlock=blk_1073741825_1185 of src=/tmp/bar.txt is not sufficiently
> replicated yet.
> 2016-10-25 15:34:46,450 INFO Server - IPC Server handler 7 on 50130, call
> Call#25082 Retry#0 org.apache.hadoop.hdfs.protocol.ClientProtocol.append from
> 127.0.0.1:50147
> java.io.IOException: append: lastBlock=blk_1073741825_1185 of
> src=/tmp/bar.txt is not sufficiently replicated yet.
> at
> org.apache.hadoop.hdfs.server.namenode.FSDirAppendOp.appendFile(FSDirAppendOp.java:136)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.appendFile(FSNamesystem.java:2423)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.append(NameNodeRpcServer.java:773)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.append(ClientNamenodeProtocolServerSideTranslatorPB.java:444)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:467)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:990)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:845)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:788)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1795)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2535)
> Exception in thread "Thread-143" java.lang.RuntimeException:
> java.io.IOException: HTTP status [500], exception
> [org.apache.hadoop.ipc.RemoteException], message [append:
> lastBlock=blk_1073741825_1185 of src=/tmp/bar.txt is not sufficiently
> replicated yet.]
> at
> org.apache.hadoop.fs.http.client.BaseTestHttpFSWith$1.run(BaseTestHttpFSWith.java:283)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.io.IOException: HTTP status [500], exception
> [org.apache.hadoop.ipc.RemoteException], message [append:
> lastBlock=blk_1073741825_1185 of src=/tmp/bar.txt is not sufficiently
> replicated yet.]
> at
> org.apache.hadoop.util.HttpExceptionUtils.validateResponse(HttpExceptionUtils.java:159)
> at
> org.apache.hadoop.fs.http.client.HttpFSFileSystem$HttpFSDataOutputStream.close(HttpFSFileSystem.java:470)
> at
> org.apache.hadoop.fs.http.client.BaseTestHttpFSWith$1.run(BaseTestHttpFSWith.java:279)
> ... 1 more
> org.apache.hadoop.fs.ChecksumException: Checksum CRC32C not matched for file
> /tmp/bar.txt at position 0: expected=C893FEDE but computed=69322F90,
> algorithm=PureJavaCrc32C
> at
> org.apache.hadoop.util.DataChecksum.throwChecksumException(DataChecksum.java:407)
> at
> org.apache.hadoop.util.DataChecksum.verifyChunked(DataChecksum.java:351)
> at
> org.apache.hadoop.util.DataChecksum.verifyChunkedSums(DataChecksum.java:311)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.readNextPacket(BlockReaderRemote.java:216)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.read(BlockReaderRemote.java:144)
> at
> org.apache.hadoop.hdfs.ByteArrayStrategy.readFromBlock(ReaderStrategy.java:119)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:704)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:765)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:814)
> at java.io.DataInputStream.read(DataInputStream.java:149)
> at
> org.apache.hadoop.fs.http.client.BaseTestHttpFSWith$1ReaderRunnable.run(BaseTestHttpFSWith.java:302)
> at java.lang.Thread.run(Thread.java:745)
> {quote}
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