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