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https://issues.apache.org/jira/browse/HADOOP-12282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16898008#comment-16898008
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Lisheng Sun commented on HADOOP-12282:
--------------------------------------
I am very happy that this patch makes sense for [~jojochuang]. Could you mind
help review it? Thanx.
> Connection thread's name should be updated after address changing is detected
> -----------------------------------------------------------------------------
>
> Key: HADOOP-12282
> URL: https://issues.apache.org/jira/browse/HADOOP-12282
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Reporter: zhouyingchao
> Assignee: Lisheng Sun
> Priority: Major
> Attachments: HADOOP-12282-001.patch, HADOOP-12282.002.patch
>
>
> In a hadoop hdfs cluster, I changed the standby Namenode's ip address (the
> hostname is not changed and the routing tables are updated). After the
> change, the cluster is running as normal.
> However, I found that the debug message of datanode's IPC still prints the
> original ip address. By looking into the implementation, it turns out that
> the original address is used as the thread's name. I think the thread's name
> should be changed if the address change is detected. Because one of the
> constituent elements of the thread's name is server.
> {code:java}
> Connection(ConnectionId remoteId, int serviceClass,
> Consumer<Connection> removeMethod) {
> ......
> UserGroupInformation ticket = remoteId.getTicket();
> // try SASL if security is enabled or if the ugi contains tokens.
> // this causes a SIMPLE client with tokens to attempt SASL
> boolean trySasl = UserGroupInformation.isSecurityEnabled() ||
> (ticket != null && !ticket.getTokens().isEmpty());
> this.authProtocol = trySasl ? AuthProtocol.SASL : AuthProtocol.NONE;
> this.setName("IPC Client (" + socketFactory.hashCode() +") connection to " +
> server.toString() +
> " from " + ((ticket==null)?"an unknown user":ticket.getUserName()));
> this.setDaemon(true);
> }{code}
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