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https://issues.apache.org/jira/browse/HBASE-3492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989681#comment-12989681
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stack commented on HBASE-3492:
------------------------------
I'd say just do the latter Lars. There's already enough work to do (Good one
finding its not broke in branch).
> 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
> Assignee: Lars George
> Priority: Minor
> Fix For: 0.90.1, 0.92.0
>
> Attachments: HBASE-3492-v2-with-test.patch, HBASE-3492.patch
>
>
> 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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