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HBase, mail # user - HRegionInfo was null or empty


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Re: HRegionInfo was null or empty
Ted Yu 2013-01-25, 00:34
bq. Encountered problems when prefetch META table:

You can ignore the warning.

Cheers

On Thu, Jan 24, 2013 at 1:38 PM, Jean-Marc Spaggiari <
[EMAIL PROTECTED]> wrote:

> Hi,
>
> I'm getting this error (multiple corrurances) while running a MR which
> is populating an empty table. MR is run against the 'entry' table
> where I get each line and store the CRC into 'entry_crc' table.
>
> 2013-01-24 12:49:01,664 WARN
>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
> Encountered problems when prefetch META table:
> java.io.IOException: HRegionInfo was null or empty in Meta for
> entry_crc, row=entry_crc,\x00\x00\x00\x00\xBF\xB0\xE4>
> bluejacketsxtra.dispatch.com,99999999999999
>         at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:170)
>         at
> org.apache.hadoop.hbase.client.MetaScanner.access$000(MetaScanner.java:54)
>         at
> org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:133)
>         at
> org.apache.hadoop.hbase.client.MetaScanner$1.connect(MetaScanner.java:130)
>         at
> org.apache.hadoop.hbase.client.HConnectionManager.execute(HConnectionManager.java:365)
>         at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:130)
>         at
> org.apache.hadoop.hbase.client.MetaScanner.metaScan(MetaScanner.java:105)
>         at
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.prefetchRegionCache(HConnectionManager.java:933)
>         at
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:988)
>         at
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:875)
>         at
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.relocateRegion(HConnectionManager.java:846)
>         at
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionLocation(HConnectionManager.java:746)
>         at
> org.apache.hadoop.hbase.client.ServerCallable.connect(ServerCallable.java:82)
>         at
> org.apache.hadoop.hbase.client.ServerCallable.withRetries(ServerCallable.java:162)
>         at
> org.apache.hadoop.hbase.client.HTable.checkAndPut(HTable.java:873)
>         at
> org.spaggiari.mapreduce.GenerateCRC$GenerateCRCMapper.map(GenerateCRC.java:122)
>         at
> org.spaggiari.mapreduce.GenerateCRC$GenerateCRCMapper.map(GenerateCRC.java:1)
>         at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
>         at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
>         at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at javax.security.auth.Subject.doAs(Subject.java:415)
>         at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
>         at org.apache.hadoop.mapred.Child.main(Child.java:249)
>
> I'm wondering if this is normal or not. I saw it once, so I cleaned
> the table and restarted the job, but I'm seeing it again. So it seems
> it's reproductible. But it's also only a WARN. Not an error...
>
> Show I simply ignore this? Or should I dig a bit?
>
> JM
>