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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3492) NPE while splitting table with empty column family store
Date Mon, 31 Jan 2011 09:16:11 GMT
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 then 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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