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From Barry Haddow <bhad...@inf.ed.ac.uk>
Subject Region servers shut down with UnknownScannerException
Date Mon, 29 Sep 2008 14:18:19 GMT
Hi

I recently set up a small hbase cluster (v 0.18) running on top of hadoop 
v.0.18.1. However I'm observing that the region servers spontaneously shut 
themselves down, usually with an UnknownScannerException. For instance, this 
weekend, I discovered that all four had shut down, with messages like the 
following in the logs:

2008-09-29 05:50:17,203 INFO org.apache.hadoop.dfs.DFSClient: Exception in 
createBlockOutputStream java.io.IOException: Bad connect ack with 
firstBadLink 129.215.197.39:50010
2008-09-29 05:50:17,203 INFO org.apache.hadoop.dfs.DFSClient: Abandoning block 
blk_-5829206400135277905_3045
2008-09-29 07:29:16,552 INFO 
org.apache.hadoop.hbase.regionserver.HRegionServer: MSG_CALL_SERVER_STARTUP
2008-09-29 07:46:35,796 INFO org.apache.hadoop.ipc.Server: IPC Server handler 
4 on 60020, call next(-1347145425990165691) from 129.215.197.39:6999: error: 
org.apache.hadoop.hbase.UnknownScannerException: Name: -1347145425990165691


The underlying hdfs seems fine - fsck reports the hbase directory as healthy. 
After a restart hbase seems fine too, but surely the regionservers should 
stay up once they're started,

Any suggestions?

regards
Barry

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


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