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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3492) NPE while splitting table with empty column family store
Date Wed, 02 Feb 2011 07:11:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989536#comment-12989536

Lars George commented on HBASE-3492:

I checked and 0.90 branch was OK! This is a regression introduced by HBASE-3437 into trunk.
While it is good to add the test, I am wondering how we undo regressions? Could someone advise?
Should I create a patch for the branch just with the test (which is not really needed there
as a) branch is only for bugfixes and b) the code is correct there anyways) and another reverting
the change plus the test for trunk (which is what the attached patch v2 is actually)?

> 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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