Re: SocketTimeoutException on regionservers

2017-01-19 Thread Yu Li 
Have you ever checked the RS gc log and observed any long ones?

Please also check the load of your RS/DN machine when this
SocketTimeoutException happens, there may be some pause caused by system
halt instead of JVM GC.

Hope this helps.

Best Regards,
Yu

On 17 January 2017 at 13:29, Stack  wrote:

> Timeout after waiting ten seconds to read from HDFS is no fun. Tell us more
> about your HDFS setup. You collect system metrics on disks? Machines are
> healthy all around? How frequent does this occur?
>
> Thanks for the question,
> S
>
> On Thu, Jan 12, 2017 at 10:18 AM, Tulasi Paradarami <
> tulasi.krishn...@gmail.com> wrote:
>
> > 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: 1 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//ec9ca
> > java.net.SocketTimeoutException: 1 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
> >

Re: SocketTimeoutException on regionservers

2017-01-16 Thread Stack 
Timeout after waiting ten seconds to read from HDFS is no fun. Tell us more
about your HDFS setup. You collect system metrics on disks? Machines are
healthy all around? How frequent does this occur?

Thanks for the question,
S

On Thu, Jan 12, 2017 at 10:18 AM, Tulasi Paradarami <
tulasi.krishn...@gmail.com> wrote:

> 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: 1 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//ec9ca
> java.net.SocketTimeoutException: 1 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.

Re: SocketTimeoutException on regionservers

2017-01-13 Thread Tulasi Paradarami 
Any comments?

On Thu, Jan 12, 2017 at 10:18 AM, Tulasi Paradarami <
tulasi.krishn...@gmail.com> wrote:

> 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: 1 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//ec9ca
> java.net.SocketTimeoutException: 1 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

SocketTimeoutException on regionservers

2017-01-12 Thread Tulasi Paradarami 
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: 1 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//ec9ca
java.net.SocketTimeoutException: 1 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