Hi, 1. Stop the job tracker and task trackers. - bin/stop-mapred.sh 2. Disable namenode safemode - bin/hadoop dfsadmin -safemode leave
3. Start the job tracker and tasktrackers again - bin/start-mapred.sh On Fri, Jan 13, 2012 at 5:20 AM, Ravi Prakash <ravihad...@gmail.com> wrote: > Courtesy Kihwal and Bobby > > Have you tried increasing the max heap size with -Xmx? and make sure that > you have swap enabled. > > On Wed, Jan 11, 2012 at 6:59 PM, Gaurav Bagga <gbagg...@gmail.com> wrote: > > > Hi > > > > hadoop-0.19 > > I have a working hadoop cluster which has been running perfectly for > > months. > > But today after restarting the cluster, at jobtracker UI its showing > state > > INITIALIZING for a long time and is staying on the same state. > > The nodes in jobtracker are zero whereas all the nodes are present on the > > dfs. > > It says Safe mode is on. > > grep'ed on slaves and I see the tasktrackers running. > > > > In namenode logs i get the following error > > > > > > 2012-01-11 16:50:57,195 WARN ipc.Server - Out of Memory in server select > > java.lang.OutOfMemoryError: Java heap space > > at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:39) > > at java.nio.ByteBuffer.allocate(ByteBuffer.java:312) > > at > > org.apache.hadoop.ipc.Server$Connection.readAndProcess(Server.java:804) > > at org.apache.hadoop.ipc.Server$Listener.doRead(Server.java:400) > > at org.apache.hadoop.ipc.Server$Listener.run(Server.java:309) > > > > Not sure why the cluster is not coming up > > -G > > > -- https://github.com/zinnia-phatak-dev/Nectar
