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From "tom liu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-7017) ipc.Client.Connection.receiveResponse throws ClassNotFoundException when large requests are sent to RPC.Server
Date Wed, 03 Nov 2010 06:38:25 GMT
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


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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