JiangHua Zhu created HDFS-16565:
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Summary: Optimize DataNode#DataTransfer, when encountering
NoRouteToHostException
Key: HDFS-16565
URL: https://issues.apache.org/jira/browse/HDFS-16565
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 3.3.0
Reporter: JiangHua Zhu
When DataTransfer runs, the local node needs to connect to another DataNode,
which is through socket. Once the connection fails, a NoRouteToHostException
will be generated.
Exception information:
2022-04-29 15:47:47,931 WARN org.apache.hadoop.hdfs.server.datanode.DataNode:
DatanodeRegistration(xxxx.xxxx.xxxx.xxxx:1004,
datanodeUuid=xxxx.xxxx.xxxx.xxxx, infoPort=1006 , infoSecurePort=0,
ipcPort=8025,
storageInfo=lv=-57;cid=xxxx.xxxx.xxxx.xxxx;nsid=961284063;c=1589290804417):Failed
to transfer BP-1375239094-xxxx.xxxx.xxxx.xxxx-
1589290804417:blk_-9223372035798255743_66037710 to xxxx.xxxx.xxx.xxxx:1004 got
java.net.NoRouteToHostException: No route to host
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at
org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:533)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:497)
at
org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer.run(DataNode.java:2562)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
The source of the accident:
sock = newSocket();
NetUtils.connect(sock, curTarget, dnConf.socketTimeout);
sock.setTcpNoDelay(dnConf.getDataTransferServerTcpNoDelay());
sock.setSoTimeout(targets.length * dnConf.socketTimeout);
When a NoRouteToHostException occurs, the Block will be added to the
VolumeScanner, and the VolumeScanner will start working to scan the Block. This
should not happen because this is not a real IOException.
catch (IOException ie) {
handleBadBlock(b, ie, false);
LOG.warn("{}:Failed to transfer {} to {} got",
bpReg, b, targets[0], ie);
}
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