On Tue, Jan 24, 2012 at 5:01 PM, Stack <st...@duboce.net> wrote: > On Tue, Jan 24, 2012 at 12:10 PM, Fei Dong <dongfei...@gmail.com> wrote: > > I test the hbase shell on another machine, which can "put", "get" > > record successfully. So I guess Zookeeper is running. > > > > Whats difference between two machines? > > Oh, I launch one master and one slave on EC2 which have the same config. I run a zkcli.sh on one slave machine and test hbase shell which shows it can connect to HBASE master node and do put/get operations.
> > It is weird that it does not mention any path or class name behind > > "NoClassDefFoundError" > > It seems some error occurs when copying jar from JobTracker to > > TaskTracker, or it does not copy. > > > > The task tracker error log: > > > > Exception in thread "main" java.lang.NoClassDefFoundError: > > Caused by: java.lang.ClassNotFoundException: > > > This says that you likely have mangled CLASSPATH: > > http://stackoverflow.com/questions/2159006/noclassdeffounderror-without-any-class-name > > Is that possible? > > Thanks. I comment /* String std_child_opts="-server "+ "-XX:+HeapDumpOnOutOfMemoryError "+ "-XX:+UseConcMarkSweepGC "+ "-XX:+UseParNewGC "; //"-XX:ParallelGCThreads=8"; conf.set("mapred.map.child.java.opts","-Xmx500m "+std_child_opts); conf.set("mapred.reduce.child.java.opts","-Xmx1000m "+std_child_opts); conf.set("mapred.map.output.compression.codec","org.apache.hadoop.io.compress.SnappyCodec"); conf.set("mapred.output.compression.codec","org.apache.hadoop.io.compress.SnappyCodec"); */ Then NoClassDefFoundError disappear, instead it shows the "HBase is able to connect to ZooKeeper but the connection closes immediately. This could be a sign that the server has too many connections (30 is the default)." St.Ack > > > at java.net.URLClassLoader$1.run(URLClassLoader.java:202) > > at java.security.AccessController.doPrivileged(Native Method) > > at java.net.URLClassLoader.findClass(URLClassLoader.java:190) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:307) > > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) > > at java.lang.ClassLoader.loadClass(ClassLoader.java:248) > > Could not find the main class: . Program will exit. > >> > >> St.Ack > > > > > > > > -- > > Best Regards, > > -- > > Fei Dong > -- Best Regards, -- Fei Dong **
