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https://issues.apache.org/jira/browse/HDFS-12737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17721964#comment-17721964
]
Dheeren Beborrtha commented on HDFS-12737:
------------------------------------------
We are observing this issue in Hbase cluster of around 75 RSs experiencing the
issue where Region Server is littered with following logs:
{noformat}
2023-05-09 18:47:46,092 WARN
[RpcServer.default.FPBQ.Fifo.handler=27,queue=3,port=16020] hdfs.DFSClient:
Connection failure: Failed to connect to
hbase1wn41-0.subnetpoc1.vcn12231050.oraclevcn.com/10.1.64.234:1019 for file
/apps/hbase/data/data/default/usertable2/fe172ff893d8afcf20c008e3765077da/cf/921cfad177b0434a957079cd4506c834
for block
BP-1395570538-10.1.21.157-1682117242080:blk_1093623349_19885353:org.apache.hadoop.net.ConnectTimeoutException:
60000 millis timeout while waiting for channel to be ready for connect. ch :
java.nio.channels.SocketChannel[connection-pending
remote=hbase1wn41-0.subnetpoc1.vcn12231050.oraclevcn.com/10.1.64.234:1019]
org.apache.hadoop.net.ConnectTimeoutException: 60000 millis timeout while
waiting for channel to be ready for connect. ch :
java.nio.channels.SocketChannel[connection-pending
remote=hbase1wn41-0.subnetpoc1.vcn12231050.oraclevcn.com/10.1.64.234:1019]
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:589)
at
org.apache.hadoop.hdfs.DFSClient.newConnectedPeer(DFSClient.java:3033)
at
org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.nextTcpPeer(BlockReaderFactory.java:829)
at
org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReaderFromTcp(BlockReaderFactory.java:754)
at
org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.build(BlockReaderFactory.java:381)
at
org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:755)
at
org.apache.hadoop.hdfs.DFSInputStream.actualGetFromOneDataNode(DFSInputStream.java:1199)
at
org.apache.hadoop.hdfs.DFSInputStream.fetchBlockByteRange(DFSInputStream.java:1151)
at org.apache.hadoop.hdfs.DFSInputStream.pread(DFSInputStream.java:1511)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1475)
at
org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:98)
at
org.apache.hadoop.hbase.io.util.BlockIOUtils.preadWithExtra(BlockIOUtils.java:233)
at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readAtOffset(HFileBlock.java:1456)
at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockDataInternal(HFileBlock.java:1679)
at
org.apache.hadoop.hbase.io.hfile.HFileBlock$FSReaderImpl.readBlockData(HFileBlock.java:1490)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.readBlock(HFileReaderImpl.java:1308)
at
org.apache.hadoop.hbase.io.hfile.HFileBlockIndex$CellBasedKeyBlockIndexReader.loadDataBlockWithScanInfo(HFileBlockIndex.java:318)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.seekTo(HFileReaderImpl.java:659)
at
org.apache.hadoop.hbase.io.hfile.HFileReaderImpl$HFileScannerImpl.seekTo(HFileReaderImpl.java:612)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.seekAtOrAfter(StoreFileScanner.java:306)
at
org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:214)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.seekScanners(StoreScanner.java:408)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:253)
at
org.apache.hadoop.hbase.regionserver.HStore.createScanner(HStore.java:2100)
at
org.apache.hadoop.hbase.regionserver.HStore.getScanner(HStore.java:2091)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.initializeScanners(HRegion.java:7049)
at
org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:7029)
at
org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:3043)
at
org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:3023)
at
org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:3005)
at
org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:2999)
at
org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2614)
at
org.apache.hadoop.hbase.regionserver.RSRpcServices.get(RSRpcServices.java:2538)
at
org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:45945)
at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:384)
at
org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:131){noformat}
|| ||
|[root@hbase1wn61-0 ~]# netstat -nat \| awk '\{print $6}' \| sort \| uniq -c \|
sort -n
1 established)
1 Foreign
1 SYN_RECV
2 FIN_WAIT1
2 LAST_ACK
27 LISTEN
138 CLOSE_WAIT
155 ESTABLISHED
120175 TIME_WAIT|
The TIME_WAIT shooting up to 200K+.
> Thousands of sockets lingering in TIME_WAIT state due to frequent file open
> operations
> --------------------------------------------------------------------------------------
>
> Key: HDFS-12737
> URL: https://issues.apache.org/jira/browse/HDFS-12737
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ipc
> Environment: CDH5.10.2, HBase Multi-WAL=2, 250 replication peers
> Reporter: Wei-Chiu Chuang
> Priority: Major
>
> On a HBase cluster we found HBase RegionServers have thousands of sockets in
> TIME_WAIT state. It depleted system resources and caused other services to
> fail.
> After months of troubleshooting, we found the issue is the cluster has
> hundreds of replication peers, and has multi-WAL = 2. That creates hundreds
> of replication threads in HBase RS, and each thread opens WAL file *every
> second*.
> We found that the IPC client closes socket right away, and does not reuse
> socket connection. Since each closed socket stays in TIME_WAIT state for 60
> seconds in Linux by default, that generates thousands of TIME_WAIT sockets.
> {code:title=ClientDatanodeProtocolTranslatorPB:createClientDatanodeProtocolProxy}
> // Since we're creating a new UserGroupInformation here, we know that no
> // future RPC proxies will be able to re-use the same connection. And
> // usages of this proxy tend to be one-off calls.
> //
> // This is a temporary fix: callers should really achieve this by using
> // RPC.stopProxy() on the resulting object, but this is currently not
> // working in trunk. See the discussion on HDFS-1965.
> Configuration confWithNoIpcIdle = new Configuration(conf);
> confWithNoIpcIdle.setInt(CommonConfigurationKeysPublic
> .IPC_CLIENT_CONNECTION_MAXIDLETIME_KEY, 0);
> {code}
> This piece of code is used in DistributedFileSystem#open()
> {noformat}
> 2017-10-27 14:01:44,152 DEBUG org.apache.hadoop.ipc.Client: New connection
> Thread[IPC Client (1838187805) connection to /172.131.21.48:20001 from
> blk_1013754707_14032,5,main] for remoteId /172.131.21.48:20001
> java.lang.Throwable: For logging stack trace, not a real exception
> at org.apache.hadoop.ipc.Client.getConnection(Client.java:1556)
> at org.apache.hadoop.ipc.Client.call(Client.java:1482)
> at org.apache.hadoop.ipc.Client.call(Client.java:1443)
> at
> org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230)
> at com.sun.proxy.$Proxy28.getReplicaVisibleLength(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientDatanodeProtocolTranslatorPB.getReplicaVisibleLength(ClientDatanodeProtocolTranslatorPB.java:198)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readBlockLength(DFSInputStream.java:365)
> at
> org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:335)
> at
> org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:271)
> at
> org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:263)
> at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1585)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:326)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:322)
> at
> org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:322)
> at
> org.apache.hadoop.fs.FilterFileSystem.open(FilterFileSystem.java:162)
> at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:783)
> at
> org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:293)
> at
> org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:267)
> at
> org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:255)
> at
> org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:414)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationWALReaderManager.openReader(ReplicationWALReaderManager.java:70)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource$ReplicationSourceWorkerThread.openReader(ReplicationSource.java:747)
> at
> org.apache.hadoop.hbase.replication.regionserver.ReplicationSource$ReplicationSourceWorkerThread.run(ReplicationSource.java:543)
> {noformat}
> Unfortunately, given the HBase's usage pattern, this hack creates the problem.
> Ignoring the fact that having hundreds of HBase replication peers is a bad
> practice (I'll probably file a HBASE jira to help remedy that), the fact that
> Hadoop IPC client does not reuse socket seems not right. The relevant code is
> historical and deep in the stack, so I'd like to invite comments. I have a
> patch but it's pretty hacky.
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