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Date: Mon, 31 Jan 2011 09:46:11 +0000 (UTC)
From: "Lars George (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] Commented: (HBASE-3492) NPE while splitting table with empty
 column family store
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    [ https://issues.apache.org/jira/browse/HBASE-3492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988709#comment-12988709 ] 

Lars George commented on HBASE-3492:
------------------------------------

The above gets eventually cleaned up by the master as it sees the references and performs the cleanup, so that borked line disappears and you can run "split" again, just to trigger a new NPE while waiting for the master to clean up the mess once again.

> NPE while splitting table with empty column family store
> --------------------------------------------------------
>
>                 Key: HBASE-3492
>                 URL: https://issues.apache.org/jira/browse/HBASE-3492
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.0
>            Reporter: Lars George
>            Priority: Minor
>
> I did a simple test on trunk where I create a table (after wiping the local /tmp/hbase-<username>):
> {code}
> hbase(main):001:0> create 'testtable', 'cf1', 'cf2'                                                                                                  
> {code}
> Then I inserted 17k rows:
> {code}
> hbase(main):002:0> for i in 'a'..'z' do for j in 'a'..'z' do for k in 'a'..'z' do put 'testtable', "row-#{i}#{j}#{k}", "cf1:#{k}", "#{k}" end end end
> {code}
> and called 
> {code}
> hbase(main):003:0> split 'testttable'
> {code}
> and the logs gave this NPE and _no_ split was performed:
> {code}
> 2011-01-31 10:06:38,534 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memstore flush for testtable,,1296461957099.2528e23534565a83e2c8590d33f3a47c., current region memstore size 3.5m
> 2011-01-31 10:06:38,575 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Finished snapshotting, commencing flushing stores
> 2011-01-31 10:06:38,856 INFO org.apache.hadoop.hbase.regionserver.Store: Renaming flushed file at file:/tmp/hbase-larsgeorge/hbase/testtable/2528e23534565a83e2c8590d33f3a47c/.tmp/5265602271926296451 to file:/tmp/hbase-larsgeorge/hbase/testtable/2528e23534565a83e2c8590d33f3a47c/cf1/5349044325262044918
> 2011-01-31 10:06:38,861 INFO org.apache.hadoop.hbase.regionserver.Store: Added file:/tmp/hbase-larsgeorge/hbase/testtable/2528e23534565a83e2c8590d33f3a47c/cf1/5349044325262044918, entries=17576, sequenceid=17588, memsize=3.5m, filesize=549.9k
> 2011-01-31 10:06:38,863 INFO org.apache.hadoop.hbase.regionserver.HRegion: Finished memstore flush of ~3.5m for region testtable,,1296461957099.2528e23534565a83e2c8590d33f3a47c. in 328ms, sequenceid=17588, compaction requested=false
> 2011-01-31 10:06:38,869 INFO org.apache.hadoop.hbase.regionserver.HRegion: Starting compaction on region testtable,,1296461957099.2528e23534565a83e2c8590d33f3a47c.
> 2011-01-31 10:06:38,870 INFO org.apache.hadoop.hbase.regionserver.HRegion: aborted compaction on region testtable,,1296461957099.2528e23534565a83e2c8590d33f3a47c. after 0sec
> 2011-01-31 10:06:38,872 ERROR org.apache.hadoop.hbase.regionserver.CompactSplitThread: Compaction failed for region testtable,,1296461957099.2528e23534565a83e2c8590d33f3a47c.
> java.lang.NullPointerException
>         at org.apache.hadoop.hbase.regionserver.Store.checkSplit(Store.java:1367)
>         at org.apache.hadoop.hbase.regionserver.Store.compact(Store.java:633)
>         at org.apache.hadoop.hbase.regionserver.HRegion.compactStores(HRegion.java:793)
>         at org.apache.hadoop.hbase.regionserver.CompactSplitThread.run(CompactSplitThread.java:81)
> 2011-01-31 10:06:38,873 DEBUG org.apache.hadoop.hbase.regionserver.CompactSplitThread: Compaction requested for testtable,,1296461957099.2528e23534565a83e2c8590d33f3a47c. because User-triggered split; priority=1, compaction queue size=0
> {code}
> I added a row with data in cf2:
> {code}
> hbase(main):005:0> put 'testtable', 'row1', 'cf2', 'test1'                                                                                           
> {code}
> and the tried to split the table again like above and now it worked.

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