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From Tulasi Paradarami <tulasi.krishn...@gmail.com>
Subject SocketTimeoutException on regionservers
Date Thu, 12 Jan 2017 18:18:07 GMT
Hi,

I noticed that Regionservers are raising following exceptions
intermittently that is manifesting itself as request timeouts on the client
side. HDFS is in a healthy state and there are no corrupted blocks (from
"hdfs fsck" results). Datanodes were not out of service when this error
occurs and GC on datanodes is usually around 0.3sec.

Also, when these exceptions occur, HDFS metric "Send Data Packet Blocked On
Network Average Time" tends to go up.

Here are the configured values for some of the relevant parameters:
dfs.client.socket-timeout: 10s
dfs.datanode.socket.write.timeout: 10s
dfs.namenode.avoid.read.stale.datanode: true
dfs.namenode.avoid.write.stale.datanode: true
dfs.datanode.max.xcievers: 8192

Any pointers towards what could be causing these exceptions is appreciated.
Thanks.

CDH 5.7.2
HBase 1.2.0

---> Regionserver logs

2017-01-11 19:19:04,940 WARN
 [PriorityRpcServer.handler=3,queue=1,port=60020] hdfs.BlockReaderFactory:
I/O error constructing remote block reader.
java.net.SocketTimeoutException: 10000 millis timeout while waiting for
channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/datanode3:27094
remote=/datanode2:50010]
        at
org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
        ...

2017-01-11 19:19:04,995 WARN
 [PriorityRpcServer.handler=11,queue=1,port=60020] hdfs.DFSClient:
Connection failure: Failed to connect to /datanode2:50010 for file
/hbase/data/default/<table_name>/ec9ca
java.net.SocketTimeoutException: 10000 millis timeout while waiting for
channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/datanode3:27107
remote=/datanode2:50010]
        at
org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
        at
org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.readChannelFully(PacketReceiver.java:258)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:209)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:171)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:102)
        at
org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:207)
        at
org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:156)
        at
org.apache.hadoop.hdfs.BlockReaderUtil.readAll(BlockReaderUtil.java:32)
        at
org.apache.hadoop.hdfs.RemoteBlockReader2.readAll(RemoteBlockReader2.java:386)
        at
org.apache.hadoop.hdfs.DFSInputStream.actualGetFromOneDataNode(DFSInputStream.java:1193)
        at
org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:1112)
        at
org.apache.hadoop.hdfs.DFSInputStream.pread(DFSInputStream.java:1473)
        at
org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1432)
        at
org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:89)
        at
org.apache.hadoop.hbase.io.hfile.HFileBlock.positionalReadWithExtra(HFileBlock.java:752)
        at
org.apache.hadoop.hbase.io.hfile.HFileBlock$AbstractFSReader.readAtOffset(HFileBlock.java:1448)
        at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockDataInternal(HFileBlock.java:1648)
        at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockData(HFileBlock.java:1532)
        at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2.readBlock(HFileReaderV2.java:445)
        at
org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$BlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:261)
        at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.seekTo(HFileReaderV2.java:642)
        at
org.apache.hadoop.hbase.io.hfile.HFileReaderV2$AbstractScannerV2.reseekTo(HFileReaderV2.java:622)
        at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseekAtOrAfter(StoreFileScanner.java:314)
        at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.reseek(StoreFileScanner.java:226)
        at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.enforceSeek(StoreFileScanner.java:437)
        at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.pollRealKV(KeyValueHeap.java:340)
        at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.generalizedSeek(KeyValueHeap.java:296)
        at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.requestSeek(KeyValueHeap.java:261)
        at
org.apache.hadoop.hbase.regionserver.StoreScanner.reseek(StoreScanner.java:806)
        at
org.apache.hadoop.hbase.regionserver.StoreScanner.seekAsDirection(StoreScanner.java:794)
        at
org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:617)
        at
org.apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:147)
        at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.populateResult(HRegion.java:5696)
        at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextInternal(HRegion.java:5855)
        at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5633)
        at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.nextRaw(HRegion.java:5619)
        at
org.apache.phoenix.coprocessor.BaseScannerRegionObserver$2.nextRaw(BaseScannerRegionObserver.java:330)
        at
org.apache.phoenix.iterate.RegionScannerResultIterator.next(RegionScannerResultIterator.java:50)
        at
org.apache.phoenix.iterate.OrderedResultIterator.getResultIterator(OrderedResultIterator.java:240)
        at
org.apache.phoenix.iterate.OrderedResultIterator.next(OrderedResultIterator.java:193)
        at
org.apache.phoenix.coprocessor.ScanRegionObserver.getTopNScanner(ScanRegionObserver.java:245)
        at
org.apache.phoenix.coprocessor.ScanRegionObserver.doPostScannerOpen(ScanRegionObserver.java:226)
        at
org.apache.phoenix.coprocessor.BaseScannerRegionObserver.postScannerOpen(BaseScannerRegionObserver.java:202)
        at
org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$52.call(RegionCoprocessorHost.java:1334)
        at
org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost$RegionOperation.call(RegionCoprocessorHost.java:1673)
        at
org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperation(RegionCoprocessorHost.java:1749)
        at
org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.execOperationWithResult(RegionCoprocessorHost.java:1712)
        at
org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.postScannerOpen(RegionCoprocessorHost.java:1329)
        at
org.apache.hadoop.hbase.regionserver.RSRpcServices.scan(RSRpcServices.java:2408)
        at
org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:33648)
        at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2170)
        at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:109)
        at
org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:133)
        at
org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:108)
        at java.lang.Thread.run(Thread.java:745)


---> Datanode logs

2017-01-11 19:19:16,171 INFO  [DataXceiver for client
DFSClient_NONMAPREDUCE_-988481032_1 at /datanode4:13495 [Receiving block
BP-684272099-namenode-1472795703360:blk_1075014094_1273639]]
datanode.DataNode (BlockReceiver.java:receiveBlock(933)) - Exception for
BP-684272099-namenode-1472795703360:blk_1075014094_1273639
java.io.IOException: Premature EOF from inputStream
        at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:201)
        ...

2017-01-11 19:19:16,171 INFO  [DataXceiver for client
DFSClient_NONMAPREDUCE_-988481032_1 at /datanode4:46727 [Receiving block
BP-684272099-namenode-1472795703360:blk_1075014093_1273638]]
datanode.DataNode (BlockReceiver.java:receiveBlock(933)) - Exception for
BP-684272099-namenode-1472795703360:blk_1075014093_1273638
java.io.IOException: Premature EOF from inputStream
        at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:201)
        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:500)
        at
org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:894)
        at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:798)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:169)
        at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:106)
        at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:246)
        at java.lang.Thread.run(Thread.java:745)

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