[HDFS-10927] Lease Recovery: File not getting closed on HDFS when block write operation fails

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.7.1
• Component/s: fs
• Assignee: Unassigned
• Reporter: Nitin Goswami
• Created: 29/Sep/16 10:48
• Updated: 02/Oct/19 17:14
• Resolved: 30/Jul/19 19:09

Description

HDFS was unable to close a file when block write operation failed because of too high disk usage.

Scenario:

HBase was writing WAL logs on HDFS and the disk usage was too high at that time. While writing these WAL logs, one of the blocks writes operation failed with the following exception:

2016-09-13 10:00:49,978 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Exception for BP-337226066-192.168.193.217-1468912147102:blk_1074859607_1160899
java.net.SocketTimeoutException: 60000 millis timeout while waiting for channel to be ready for read. ch : java.nio.channels.SocketChannel[connected local=/192.168.194.144:50010 remote=/192.168.192.162:43105]
at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at java.io.DataInputStream.read(Unknown Source)
at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:199)
at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:213)
at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:134)
at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:109)
at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:472)
at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:849)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:807)
at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137)
at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:251)
at java.lang.Thread.run(Unknown Source)

After this exception, HBase tried to close/rollover the WAL file but that call also failed and WAL file couldn't be closed. After this HBase closed the region server

After some time, Lease Recovery got triggered for this file and following exceptions starts occurring:

2016-09-13 11:51:11,743 WARN org.apache.hadoop.hdfs.server.protocol.InterDatanodeProtocol: Failed to obtain replica info for block (=BP-337226066-192.168.193.217-1468912147102:blk_1074859607_1161187) from datanode (=DatanodeInfoWithStorage[192.168.192.162:50010,null,null])
java.io.IOException: THIS IS NOT SUPPOSED TO HAPPEN: getBytesOnDisk() < getVisibleLength(), rip=ReplicaBeingWritten, blk_1074859607_1161187, RBW
getNumBytes() = 45524696
getBytesOnDisk() = 45483527
getVisibleLength()= 45511557
getVolume() = /opt/reflex/data/yarn/datanode/current
getBlockFile() = /opt/reflex/data/yarn/datanode/current/BP-337226066-192.168.193.217-1468912147102/current/rbw/blk_1074859607
bytesAcked=45511557
bytesOnDisk=45483527
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2278)
at org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl.initReplicaRecovery(FsDatasetImpl.java:2254)
at org.apache.hadoop.hdfs.server.datanode.DataNode.initReplicaRecovery(DataNode.java:2542)
at org.apache.hadoop.hdfs.protocolPB.InterDatanodeProtocolServerSideTranslatorPB.initReplicaRecovery(InterDatanodeProtocolServerSideTranslatorPB.java:55)
at org.apache.hadoop.hdfs.protocol.proto.InterDatanodeProtocolProtos$InterDatanodeProtocolService$2.callBlockingMethod(InterDatanodeProtocolProtos.java:3105)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Unknown Source)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2045)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:106)
at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:95)
at org.apache.hadoop.hdfs.server.datanode.DataNode.callInitReplicaRecovery(DataNode.java:2555)
at org.apache.hadoop.hdfs.server.datanode.DataNode.recoverBlock(DataNode.java:2625)
at org.apache.hadoop.hdfs.server.datanode.DataNode.access$400(DataNode.java:243)
at org.apache.hadoop.hdfs.server.datanode.DataNode$5.run(DataNode.java:2527)
at java.lang.Thread.run(Unknown Source)

Expected Behaviour: Under all conditions lease recovery should have been done and file should have been closed.

Impact: Since the file couldn't be closed, HBase went into an incosistent state as it wasn't able to run through the WAL file after the region server restart.

Issue Links

• is related to: HDFS-11472 Fix inconsistent replica size after a data pipeline failure