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https://issues.apache.org/jira/browse/HDFS-15078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17002739#comment-17002739
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Fei Hui commented on HDFS-15078:
--------------------------------
{quote}
The issue is the first router which c, That client did failover to another
router, triggered a new call and the second router completed the call, and the
first call came after this.
{quote}
Getting EOFException makes client failover to another router.
And later and the second router completed the call, the first router the first
router.
{quote}
If such a case where one Router is delaying, I think without client connection
crashing still issues like these can come up.
{quote}
Yes. This issue only can resolve the problem on some scenarios. HDFS-15079
tracks the high level problem.
In our scenarios. This fix works.
> RBF: Should check connection channel before sending rpc to namenode
> -------------------------------------------------------------------
>
> Key: HDFS-15078
> URL: https://issues.apache.org/jira/browse/HDFS-15078
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Affects Versions: 3.3.0
> Reporter: Fei Hui
> Assignee: Fei Hui
> Priority: Major
> Attachments: HDFS-15078.001.patch, HDFS-15078.002.patch
>
>
> dfsrouter logs show that
> {quote}
> 2019-12-20 04:11:26,724 WARN org.apache.hadoop.ipc.Server: IPC Server handler
> 6400 on 8888, call org.apache.hadoop.hdfs.protocol.ClientProtocol.create from
> 10.83.164.11:56908 Call#2 Retry#0: output error
> 2019-12-20 04:11:26,724 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 125 on 8888 caught an exception
> java.nio.channels.ClosedChannelException
> at
> sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:270)
> at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:461)
> at org.apache.hadoop.ipc.Server.channelWrite(Server.java:2731)
> at org.apache.hadoop.ipc.Server.access$2100(Server.java:134)
> at
> org.apache.hadoop.ipc.Server$Responder.processResponse(Server.java:1089)
> at org.apache.hadoop.ipc.Server$Responder.doRespond(Server.java:1161)
> at
> org.apache.hadoop.ipc.Server$Connection.sendResponse(Server.java:2109)
> at
> org.apache.hadoop.ipc.Server$Connection.access$400(Server.java:1229)
> at org.apache.hadoop.ipc.Server$Call.sendResponse(Server.java:631)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2245)
> {quote}
> Maybe checking connection between client and router is better before
> sendingrpc to namenode
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