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From "tom liu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-7017) ipc.Client.Connection.receiveResponse throws ClassNotFoundException when large requests are sent to RPC.Server
Date Wed, 03 Nov 2010 07:34:25 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-7017?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

tom liu updated HADOOP-7017:
----------------------------

    Attachment: diff.patch

in ipc, the data format that Client send request to servers, is:
{noformat}
      data-length:int,data:byte[data-length]
{noformat}

but, Server send response to client, is:
{noformat}
      callid,state,data
{noformat}

i think the problem is happened when client deserialed data.

so, i changed server and client communication that use request format.
and, i found that did not throw ClassNotFoundException.

but, i am not sure that is the problem.

> ipc.Client.Connection.receiveResponse throws ClassNotFoundException when large requests
are sent to RPC.Server
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7017
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7017
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.20.2
>         Environment: JDK1.6/WindowsXP/CygWin/Tomcat6
>            Reporter: tom liu
>         Attachments: diff.patch
>
>
> i use solr with katta integration, pls see https://issues.apache.org/jira/browse/SOLR-1395
> when i use:
> {noformat}
> ab -n 100 -c 10 http://localhost:8080/solr/select?q=solr&...
> {noformat}
> i found solr throws NPE, so, i added some code like below:
> {code:title=ipc.Client.Connection|borderStyle=solid}
> public void receiveResponse() {
>       ...
>       try {
>            ...
>            ...
>       } catch (IOException e) {
>         markClosed(e);
>       } catch (RunTimeException t) {
>           LOG.error("Unexpected error reading responses on connection ", t);
>           throw t;
>       }
>     }
> {code}
> then, i catch the ClassNotFoundException:
> {noformat}
> java.lang.RuntimeException: readObject can't find class om-SL510?(responseê`?$name...
> 	at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:185)
> 	at org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:66)
> 	at org.apache.hadoop.ipc.Client$Connection.receiveResponse(Client.java:511)
> Caused by: java.lang.ClassNotFoundException: om-SL510?(responseê`?$name...
> 	at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:247)
> 	at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:762)
> 	at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:183)
> {noformat}

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