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MapReduce, mail # user - DataNodes fail to send heartbeat to HA-enabled NameNode


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Re: DataNodes fail to send heartbeat to HA-enabled NameNode
Todd Lipcon 2012-10-30, 18:23
Hi Takahiko,

Can you please provide the full datanode log up to the point where you
first see an NPE?

FWIW, this error has nothing to do with the new QuorumJournalManager
feature -- I've seen this bug once or twice over the last couple years but
never been able to reproduce it reliably.

-Todd

On Tue, Oct 30, 2012 at 10:06 AM, Steve Loughran <[EMAIL PROTECTED]>wrote:

>
>
> On 30 October 2012 11:10, Takahiko Kawasaki <[EMAIL PROTECTED]> wrote:
>
>> Hello,
>>
>> I have trouble in quorum-based HDFS HA of CDH 4.1.1.
>>
>> 2012-10-30 19:28:16,817 ERROR
>> org.apache.hadoop.hdfs.server.datanode.DataNode: Exception in
>> BPOfferService for Block pool
>> BP-2063217961-192.168.62.231-1351263110470 (storage id
>> DS-2090122187-192.168.62.233-50010-1338981658216) service to
>> node02.example.com/192.168.62.232:8020
>> java.lang.NullPointerException
>>         at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.sendHeartBeat(BPServiceActor.java:435)
>>         at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.offerService(BPServiceActor.java:521)
>>         at
>> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:674)
>>         at java.lang.Thread.run(Thread.java:662)
>> --------------------
>>
>>
> look like you've been the first person to find an issue in some code that
> is very, very fresh.
>
> File a bug report on JIRA; try to replicate it on the latest apache alpha
> release if you can.
>

--
Todd Lipcon
Software Engineer, Cloudera