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From Uma Maheswara Rao G 72686 <mahesw...@huawei.com>
Subject Re: Dananode not sending the Hearbeat messages to Namenode
Date Wed, 03 Aug 2011 06:31:27 GMT
Hi Rahul,

one possibility could be system time updations:
Can you check , System time changed in your system?
Since the heartbeats will depends on System times, that will effect sending the heartbeats
to NN.

Whihc version of hadoop are you using?
approximately how many blocks will be there in DN?


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----- Original Message -----
From: Rahul Das <rahul.hdpq@gmail.com>
Date: Wednesday, August 3, 2011 11:53 am
Subject: Dananode not sending the Hearbeat messages to Namenode
To: hdfs-user@hadoop.apache.org

> Hi,
> I found a strange behavior in my cluster. The data nodes stop 
> sending any
> information randomly (no logs coming). So the namenode thinks its 
> down. But
> after some time ( approx 30 mints) the datanode nodes comes up and 
> startbehaving properly. I tried finding any error log, but the 
> datanode node is
> not writing any error message during this time.
> The Namenode shows some warning similar to
> 2011-07-28 20:59:35,275 WARN
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
> PendingReplicationMonitor timed out block 
> blk_8370263993564715002_23947922
> I checked this is not happening due to network outage or some 
> other process
> eating up the CPU.
> Please help me with this.
> --
> Rahul

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