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Re: muti-thread mapreduce
Satish,

1. Please ask HBase questions on HBase's own lists ([EMAIL PROTECTED]).
2. Please start a new thread for new questions of yours, and not post
on an existing thread that is for some other topic.
3. The error is as it says, that your mapper could not successfully
access a specific region server. You may run "hbase hbck" to see whats
wrong, or check that specific RS's logs for more details on why it may
be throwing up that IOException. In any case, if you aren't able to
figure out, please send further questions to (1).

On Wed, Dec 26, 2012 at 1:37 PM, satish verma <[EMAIL PROTECTED]> wrote:
>
> Hi
>
>  I am using a MR job on Hbase . I am getting this sort of error on a few
> region servers. Can someone explain what this means and what should I do ?
>
>  Thanks.
>
> 12/12/26 03:03:18 INFO mapred.JobClient: Task Id :
> attempt_201210121702_699686_m_000046_0, Status : FAILED
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to contact
> region server b-app-80.ssprod:65520 for region
> webpage_production,9c3583e2e97d7845288f6792ed641e60,1343757929164, row
> '9c3583e2e97d7845288f6792ed641e60', but failed after 10 attempts.
> Exceptions:
> java.io.IOException: java.io.IOException: Could not seek
> StoreFileScanner[HFileScanner for reader
> reader=hdfs://b-hadoop-master.ssprod:54310/hbase/webpage_production/1629342332/tm/7630213467863536608,
> compression=gz, inMemory=false,
> firstKey=9c3583e2e97d7845288f6792ed641e60/tm:eid/1337397152960/Put,
> lastKey=a05d22c20c779e39dffc28fe86053408/tm:url/1352931877105/Put,
> avgKeyLen=49, avgValueLen=38, entries=4091448, length=75747961, cur=null]
>     at
> org.apache.hadoop.hbase.regionserver.StoreFileScanner.seek(StoreFileScanner.java:104)
>     at
> org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:77)
>     at
> org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:1408)
>     at org.apache.hadoop.hbase.regionserver.HRegion$RegionScanner
>

--
Harsh J