[HDFS-11056] Concurrent append and read operations lead to checksum error

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.8.0, 2.7.4, 3.0.0-alpha2
• Component/s: datanode, httpfs
• Hadoop Flags: Reviewed
• Release Note: Load last partial chunk checksum properly into memory when converting a finalized/temporary replica to rbw replica. This ensures concurrent reader reads the correct checksum that matches the data before the update.
• Assignee: Wei-Chiu Chuang
• Reporter: Wei-Chiu Chuang
• Created: 25/Oct/16 23:00
• Updated: 02/Oct/19 17:15
• Resolved: 14/Nov/16 20:01

Description

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:

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)

Issue Links

• breaks: HDFS-11229 HDFS-11056 failed to close meta file
• contains: HDFS-6804 Add test for race condition between transferring block and appending block causes "Unexpected checksum mismatch exception"
• is superceded by: HDFS-11187 Optimize disk access for last partial chunk checksum of Finalized replica
• relates to: HDFS-6804 Add test for race condition between transferring block and appending block causes "Unexpected checksum mismatch exception"