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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1309) HFile catches key in Memcache with empty value
Date Sun, 05 Apr 2009 19:27:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695891#action_12695891
] 

Andrew Purtell commented on HBASE-1309:
---------------------------------------

>From Ryan on hbase-dev@:

> I think it might be legit to store an empty value,
> empty key = not gonna happen.
>
> but if the key has enough data in it, eg: a delete tombstone, the value
> might be not interesting, so why store a placeholder?
>
> what particular circumstance is this happening under?  I dont want to 'fix'
> hfile by allowing empty/null values only to mask a different error that you
> are getting...

> HFile catches key in Memcache with empty value
> ----------------------------------------------
>
>                 Key: HBASE-1309
>                 URL: https://issues.apache.org/jira/browse/HBASE-1309
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: Andrew Purtell
>         Attachments: hbase-hadoop-regionserver-nashua.zip
>
>
> 2009-04-05 02:12:56,497 FATAL org.apache.hadoop.hbase.regionserver.MemcacheFlusher: Replay
of hlog required. Forcing server shutdown
> org.apache.hadoop.hbase.DroppedSnapshotException: region: content,,1238896745127
> 	at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:878)
> 	at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:771)
> 	at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.flushRegion(MemcacheFlusher.java:229)
> 	at org.apache.hadoop.hbase.regionserver.MemcacheFlusher.run(MemcacheFlusher.java:139)
> Caused by: java.io.IOException: Value cannot be null or empty
> 	at org.apache.hadoop.hbase.io.hfile.HFile$Writer.checkValue(HFile.java:485)
> 	at org.apache.hadoop.hbase.io.hfile.HFile$Writer.append(HFile.java:447)
> 	at org.apache.hadoop.hbase.regionserver.Store.internalFlushCache(Store.java:501)
> 	at org.apache.hadoop.hbase.regionserver.Store.flushCache(Store.java:463)
> 	at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:863)
> 	... 3 more

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