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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1039) Compaction fails if bloomfilters are enabled
Date Mon, 01 Dec 2008 19:03:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652099#action_12652099

stack commented on HBASE-1039:

Why not have the bloom Writer just not build a bloom filter if ALL inputs don't already have
blooms rather than NPE (in getReaders, if an input doesn't have nrows, set it to -1)?   Could
output a warning and just carry on.  New flushes will include bloom filters so subsequent
compactions will have bloom filters to hand.  Eventually all inputs will have bloom filters
and only then on compaction, write out compacted file with blooms.

Adding disallow set/unset would be awkward in implementation; i.e. providing the appropriate
context that determines when a flag is settable or not in HTD.

> Compaction fails if bloomfilters are enabled
> --------------------------------------------
>                 Key: HBASE-1039
>                 URL: https://issues.apache.org/jira/browse/HBASE-1039
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.18.1
>            Reporter: Andrew Purtell
> From Thibaut up on the list.
> As soon as hbase tries to compact the table, the following exception appears in the logfile:
(Other compactations also work fine without any errors)
> 2008-11-30 00:55:57,769 ERROR
> org.apache.hadoop.hbase.regionserver.CompactSplitThread: Compaction failed for region
> java.lang.IllegalArgumentException: maxValue must be > 0
>     at org.onelab.filter.HashFunction.<init>(HashFunction.java:84)
>     at org.onelab.filter.Filter.<init>(Filter.java:97)
>     at org.onelab.filter.BloomFilter.<init>(BloomFilter.java:102)
>     at org.apache.hadoop.hbase.regionserver.HStoreFile$BloomFilterMapFile$Writer.<init>(HStoreFile.java:829)
>     at org.apache.hadoop.hbase.regionserver.HStoreFile.getWriter(HStoreFile.java:436)
>     at org.apache.hadoop.hbase.regionserver.HStore.compact(HStore.java:889)
>     at org.apache.hadoop.hbase.regionserver.HRegion.compactStores(HRegion.java:902)
>     at org.apache.hadoop.hbase.regionserver.HRegion.compactStores(HRegion.java:860)
>     at org.apache.hadoop.hbase.regionserver.CompactSplitThread.run(CompactSplitThread.java:83)
> Because the region cannot compact and/or split, it is soon dead after (re)assignment.

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