[Hadoop-common-user] 14.1 to 14.2

No. Bugfix releases should be compatible.

Doug

When I tried to upgrade to 0.14.2, I ran into a different error (see snippet
below). Trying to use the new Hadoop version with Java 1.5.x fails for me,
so I had to switch to Java 1.6.x.

I was quite surprised because IMHO this is a rather big "new" requirement -
if it's intended - so I had expected to see it prominently mentioned on the
announcement/wiki/...

But maybe I messed something up during the upgrade. Feel free to correct me.

--Michael


~~~~~~~~~~~~~~~~~snippet from datanode log~~~~~~~~~~~~~~~~~~~~~~
2007-10-12 10:35:14,441 INFO org.apache.hadoop.dfs.DataNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG: host = localhost/127.0.0.1
STARTUP_MSG: args = []
************************************************************/
2007-10-12 10:35:14,662 INFO org.apache.hadoop.metrics.jvm.JvmMetrics:
Initializing JVM Metrics with processName=DataNode, sessionId=null
2007-10-12 10:35:14,852 ERROR org.apache.hadoop.dfs.DataNode:
org.apache.hadoop.ipc.RemoteException: java.io.IOException:
java.lang.ClassFo
rmatError: Illegal class modifiers in class org/apache/hadoop/package-info:
0x1600
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(
SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at java.lang.Package.getPackageInfo(Package.java:350)
at java.lang.Package.getAnnotation(Package.java:361)
at org.apache.hadoop.util.VersionInfo.(Storage.java:525)
at org.apache.hadoop.dfs.NamespaceInfo.(
FSNamesystem.java:323)
at org.apache.hadoop.dfs.NameNode.versionRequest(NameNode.java:684)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)

at org.apache.hadoop.ipc.Client.call(Client.java:470)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:165)
at org.apache.hadoop.dfs.$Proxy0.versionRequest(Unknown Source)
at org.apache.hadoop.dfs.DataNode.handshake(DataNode.java:294)
at org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:238)
at org.apache.hadoop.dfs.DataNode.(DataNode.java:1391)
at org.apache.hadoop.dfs.DataNode.run(DataNode.java:1335)
at org.apache.hadoop.dfs.DataNode.createDataNode(DataNode.java:1356)
at org.apache.hadoop.dfs.DataNode.main(DataNode.java:1525)


2007-10-12 10:35:14,853 INFO org.apache.hadoop.dfs.DataNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at localhost/127.0.0.1
************************************************************/

~~~~~~~~~~~~~~~~~~~~end of snippet~~~~~~~~~~~~~~~~~~~~~~

That is a mistake of some sort. It was _not_ intended. I assume you
are using the release tarball off of the website? It might have been
compiled with java 1.6 instead of 1.5. I believe the QA framework
runs the unit tests under 1.5 to ensure that we don't break 1.5
compatibility accidently.

I do think it is worth changing the requirement up to java 1.6, but
of course not as a patch release. *smile* (The performance of socket
polling is much much better under 1.6.) I would not recommend running
Hadoop under java 1.5 unless you don't have a choice.

-- Owen

Yes, it seems I built the 0.14.2 release using 1.6 by accident. Sorry!
If this is a blocker for folks, please file an issue in Jira and I
will make a 0.14.3 tarball that's compiled with Java 1.5 instead.
Can you please file an issue in Jira for this? Then folks can weigh in
there.

Doug