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HDFS >> mail # user >> Re: Namenode failures


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Re: Namenode failures
On Sun, Feb 17, 2013 at 4:41 PM, Mohammad Tariq <[EMAIL PROTECTED]> wrote:

> You can make use of offine image viewer to diagnose
> the fsimage file.
>

Is this not included in the 1.0.x branch?  All of the documentation I find
for it says to run 'bin/hdfs oev' but I do not have a 'bin/hdfs'.
> Warm Regards,
> Tariq
> https://mtariq.jux.com/
> cloudfront.blogspot.com
>
>
> On Mon, Feb 18, 2013 at 3:31 AM, Robert Dyer <[EMAIL PROTECTED]> wrote:
>
>> It just happened again.  This was after a fresh format of HDFS/HBase and
>> I am attempting to re-import the (backed up) data.
>>
>>   http://pastebin.com/3fsWCNQY
>>
>> So now if I restart the namenode, I will lose data from the past 3 hours.
>>
>> What is causing this?  How can I avoid it in the future?  Is there an
>> easy way to monitor (other than a script grep'ing the logs) the checkpoints
>> to see when this happens?
>>
>>
>> On Sat, Feb 16, 2013 at 2:39 PM, Robert Dyer <[EMAIL PROTECTED]> wrote:
>>
>>> Forgot to mention: Hadoop 1.0.4
>>>
>>>
>>> On Sat, Feb 16, 2013 at 2:38 PM, Robert Dyer <[EMAIL PROTECTED]> wrote:
>>>
>>>> I am at a bit of wits end here.  Every single time I restart the
>>>> namenode, I get this crash:
>>>>
>>>> 2013-02-16 14:32:42,616 INFO
>>>> org.apache.hadoop.hdfs.server.common.Storage: Image file of size 168058
>>>> loaded in 0 seconds.
>>>> 2013-02-16 14:32:42,618 ERROR
>>>> org.apache.hadoop.hdfs.server.namenode.NameNode:
>>>> java.lang.NullPointerException
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1099)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.addChild(FSDirectory.java:1111)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.addNode(FSDirectory.java:1014)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.unprotectedAddFile(FSDirectory.java:208)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSEditLog.loadFSEdits(FSEditLog.java:631)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSEdits(FSImage.java:1021)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:839)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:377)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSDirectory.loadFSImage(FSDirectory.java:100)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.initialize(FSNamesystem.java:388)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:362)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:276)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:496)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1279)
>>>>     at
>>>> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1288)
>>>>
>>>> I am following best practices here, as far as I know.  I have the
>>>> namenode writing into 3 directories (2 local, 1 NFS).  All 3 of these dirs
>>>> have the exact same files in them.
>>>>
>>>> I also run a secondary checkpoint node.  This one appears to have
>>>> started failing a week ago.  So checkpoints were *not* being done since
>>>> then.  Thus I can get the NN up and running, but with a week old data!
>>>>
>>>>  What is going on here?  Why does my NN data *always* wind up causing
>>>> this exception over time?  Is there some easy way to get notified when the
>>>> checkpointing starts to fail?
>>>>
>>>
>>>
>>>
>>> --
>>>
>>> Robert Dyer
>>> [EMAIL PROTECTED]
>>>
>>
>>
>>
>> --
>>
>> Robert Dyer
>> [EMAIL PROTECTED]
>>
>
>
--

Robert Dyer
[EMAIL PROTECTED]
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB