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From Gaurav Bagga <gbagg...@gmail.com>
Subject 0 tasktrackers in jobtracker but all datanodes present
Date Thu, 12 Jan 2012 00:59:43 GMT

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
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$Listener.doRead(Server.java:400)
        at org.apache.hadoop.ipc.Server$Listener.run(Server.java:309)

Not sure why the cluster is not coming up

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