[jira] Commented: (MAPREDUCE-2190) Temporary Fix when using Apache Harmony, can't handle default access modifier in JvmContext.java

["Guillermo Cabrera (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932557#action_12932557 ] 

Guillermo Cabrera commented on MAPREDUCE-2190:
----------------------------------------------

For more information relating to building Hadoop maprecue using Apache Harmony, please refer to http://wiki.apache.org/hadoop/HarmonyMapreduce

> Temporary Fix when using Apache Harmony, can't handle default access modifier in JvmContext.java
> ------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-2190
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2190
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>    Affects Versions: 0.21.0
>         Environment: SLE v. 11, Apache Harmony 6
>            Reporter: Guillermo Cabrera
>            Priority: Minor
>         Attachments: MAPREDUCE-2190.patch
>
>
> Using Apache Harmony Select as the JRE to test Hadoop Map/Reduce, we came across the following error:
> INFO: In JvmRunner constructed JVM ID: jvm_20101023030236354_0001_m_-37103043 
> Oct 23, 2010 3:03:09 AM org.apache.hadoop.mapred.JvmManager$JvmManagerForType spawnNewJvm
> INFO: JVM Runner jvm_20101023030236354_0001_m_-37103043 spawned.
> Oct 23, 2010 3:03:20 AM org.apache.hadoop.mapred.JvmManager$JvmManagerForType$JvmRunner runChild
> INFO: JVM : jvm_20101023030236354_0001_m_-37103043 exited with exit
> code 1. Number of tasks it ran: 0
> Oct 23, 2010 3:03:20 AM org.apache.hadoop.mapred.TaskRunner run
> WARNING: attempt_20101023030236354_0001_m_000000_0 : Child Error
> Throwable occurred: java.io.IOException: Task process exit with
> nonzero status of 1.
>        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:236)
> Oct 23, 2010 3:03:31 AM org.apache.hadoop.security.Groups <init>
> INFO: Group mapping
> impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping;
> cacheTimeout=300000
> Uncaught exception in main:
> java.lang.IllegalAccessError: from $Proxy0 to
> org/apache/hadoop/mapred/JvmContext
>        at $Proxy0.<clinit>(Unknown Source)
>        at java.lang.reflect.VMReflection.newClassInstance(VMReflection.java)
>        at java.lang.reflect.Constructor.newInstance(Constructor.java:282)
>        at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:218)
>        at org.apache.hadoop.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:224)
>        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:225)
>        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:214)
>        at org.apache.hadoop.ipc.RPC.getProxy(RPC.java:242)
>        at org.apache.hadoop.mapred.Child$1.run(Child.java:100)
>        at org.apache.hadoop.mapred.Child$1.run(Child.java:97)
>        at java.security.AccessController.doPrivilegedImpl(AccessController.java:112)
>        at java.security.AccessController.doPrivileged(AccessController.java:86)
>        at javax.security.auth.Subject.doAs_PrivilegedExceptionAction(Subject.java:284)
>        at javax.security.auth.Subject.doAs(Subject.java:225)
>        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:742)
>        at org.apache.hadoop.mapred.Child.main(Child.java:96)
> As a temporary fix, we are including a patch that will add the public access modifier to constructors in JvmContext.java and SortedRanges.java. It seems Apache Harmony has issues with the default access modifier. This is a problem with Apache Harmony and not Hadoop Map/Reduce, however, we wanted to introduce a temporary fix for anyone working with Hadoop and Apache Harmony.

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