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From Stack <st...@duboce.net>
Subject Re: Cannot open filename Exceptions
Date Tue, 16 Mar 2010 06:05:10 GMT
Maybe just the master log would be sufficient from around this time to
figure the story.
St.Ack

On Mon, Mar 15, 2010 at 10:04 PM, Stack <stack@duboce.net> wrote:
> Hey Zheng:
>
> On Mon, Mar 15, 2010 at 8:16 PM, Zheng Lv <lvzheng19800619@gmail.com> wrote:
>> Hello Stack,
>>  After we got these exceptions, we restart the cluster and restarted the
>> job that failed, and the job succeeded.
>>  Now when we access /hbase/summary/1491233486/metrics/5046821377427277894,
>> we got " Cannot access
>> /hbase/summary/1491233486/metrics/5046821377427277894: No such file or
>> directory." .
>>
>
> So, that would seem to indicate that the reference was in memory
> only.. that file was not in filesystem.  You could have tried closing
> that region.   It would have been interesting also to find history on
> that region, to try and figure how it came to hold in memory a
> reference to a file since removed.
>
>>  The messages about this file in namenode logs are in here:
>> http://rapidshare.com/files/363938595/log.txt.html
>
> This is interesting.  Do you have regionserver logs from 209, 208, and
> 210 for corresponding times?
>
> Thanks,
> St.Ack
>
>>  The job failed startted about at 17 o'clock.
>>  By the way, the hadoop version we are using is 0.20.1, the hbase version
>> we are using is 0.20.3.
>>
>>  Regards,
>>  LvZheng
>> 2010/3/16 Stack <stack@duboce.net>
>>
>>> Can you get that file from hdfs?
>>>
>>> > ./bin/hadoop fs -get
>>>  /hbase/summary/1491233486/metrics/5046821377427277894
>>>
>>> Does it look wholesome?  Is it empty?
>>>
>>> What if you trace the life of that file in regionserver logs or
>>> probably better, over in namenode log?  If you move this file aside,
>>> the region deploys?
>>>
>>> St.Ack
>>>
>>> On Mon, Mar 15, 2010 at 3:40 AM, Zheng Lv <lvzheng19800619@gmail.com>
>>> wrote:
>>> > Hello Everyone,
>>> >    Recently we often got these in our client logs:
>>> >    org.apache.hadoop.hbase.client.RetriesExhaustedException: Trying to
>>> > contact region server 172.16.1.208:60020 for region
>>> >
>>> summary,SITE_0000000032\x01pt\x0120100314000000\x01\x25E7\x258C\x25AE\x25E5\x258E\x25BF\x25E5\x2586\x2580\x25E9\x25B9\x25B0\x25E6\x2591\x25A9\x25E6\x2593\x25A6\x25E6\x259D\x2590\x25E6\x2596\x2599\x25E5\x258E\x2582\x2B\x25E6\x25B1\x25BD\x25E8\x25BD\x25A6\x25E9\x2585\x258D\x25E4\x25BB\x25B6\x25EF\x25BC\x258C\x25E5\x2598\x2580\x25E9\x2593\x2583\x25E9\x2593\x2583--\x25E7\x259C\x259F\x25E5\x25AE\x259E\x25E5\x25AE\x2589\x25E5\x2585\x25A8\x25E7\x259A\x2584\x25E7\x2594\x25B5\x25E8\x25AF\x259D\x25E3\x2580\x2581\x25E7\x25BD\x2591\x25E7\x25BB\x259C\x25E4\x25BA\x2592\x25E5\x258A\x25A8\x25E4\x25BA\x25A4\x25E5\x258F\x258B\x25E7\x25A4\x25BE\x25E5\x258C\x25BA\x25EF\x25BC\x2581,1268640385017,
>>> > row
>>> >
>>> 'SITE_0000000032\x01pt\x0120100315000000\x01\x2521\x25EF\x25BC\x2581\x25E9\x2594\x2580\x25E5\x2594\x25AE\x252F\x25E6\x2594\x25B6\x25E8\x25B4\x25AD\x25EF\x25BC\x2581VM700T\x2BVM700T\x2B\x25E5\x259B\x25BE\x25E5\x2583\x258F\x25E4\x25BF\x25A1\x25E5\x258F\x25B7\x25E4\x25BA\x25A7\x25E7\x2594\x259F\x25E5\x2599\x25A8\x2B\x25E7\x2594\x25B5\x25E5\x25AD\x2590\x25E6\x25B5\x258B\x25E9\x2587\x258F\x25E4\x25BB\x25AA\x25E5\x2599\x25A8\x25EF\x25BC\x258C\x25E5\x2598\x2580\x25E9\x2593\x2583\x25E9\x2593\x2583--\x25E7\x259C\x259F\x25E5\x25AE\x259E\x25E5\x25AE\x2589\x25E5\x2585\x25A8\x25E7\x259A\x2584\x25E7\x2594\x25B5\x25E8\x25AF\x259D\x25E3\x2580\x2581\x25E7\x25BD\x2591\x25E7\x25BB\x259C\x25E4\x25BA\x2592\x25E5\x258A\x25A8\x25E4\x25BA\x25A4\x25E5\x258F\x258B\x25E7\x25A4\x25BE\x25E5\x258C\x25BA\x25EF\x25BC\x2581',
>>> > but failed after 10 attempts.
>>> > Exceptions:
>>> > java.io.IOException: java.io.IOException: Cannot open filename
>>> > /hbase/summary/1491233486/metrics/5046821377427277894
>>> > at
>>> >
>>> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1474)
>>> > at
>>> >
>>> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.chooseDataNode(DFSClient.java:1800)
>>> > at
>>> >
>>> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.blockSeekTo(DFSClient.java:1616)
>>> > at
>>> org.apache.hadoop.hdfs.DFSClient$DFSInputStream.read(DFSClient.java:1743)
>>> > at java.io.DataInputStream.read(DataInputStream.java:132)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.io.hfile.BoundedRangeFileInputStream.read(BoundedRangeFileInputStream.java:99)
>>> > at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:100)
>>> > at
>>> org.apache.hadoop.hbase.io.hfile.HFile$Reader.decompress(HFile.java:1020)
>>> > at
>>> org.apache.hadoop.hbase.io.hfile.HFile$Reader.readBlock(HFile.java:971)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.io.hfile.HFile$Reader$Scanner.loadBlock(HFile.java:1304)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.io.hfile.HFile$Reader$Scanner.seekTo(HFile.java:1186)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.io.HalfHFileReader$1.seekTo(HalfHFileReader.java:207)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.regionserver.StoreFileGetScan.getStoreFile(StoreFileGetScan.java:80)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.regionserver.StoreFileGetScan.get(StoreFileGetScan.java:65)
>>> > at org.apache.hadoop.hbase.regionserver.Store.get(Store.java:1461)
>>> > at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:2396)
>>> > at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:2385)
>>> > at
>>> >
>>> org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1731)
>>> > at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
>>> > at
>>> >
>>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>>> > at java.lang.reflect.Method.invoke(Method.java:597)
>>> > at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:657)
>>> > at
>>> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915)
>>> >    Is there any way to fix this problem? Or is there anything we can do
>>> > even manually to relieve it?
>>> >    Any suggestion?
>>> >    Thank you.
>>> >    LvZheng
>>> >
>>>
>>
>

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