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https://issues.apache.org/jira/browse/HBASE-3492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12988705#comment-12988705
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Lars George commented on HBASE-3492:
------------------------------------
During the NPE I also get a .META. like this
{code}
hbase(main):020:0> scan '.META.', { COLUMNS => ['info:regioninfo'] }
ROW COLUMN+CELL
testtable,,1296464923560.4712495ddd39cae column=info:regioninfo,
timestamp=1296464924169, value=REGION => {NAME =>
'testtable,,1296464923560.4712495ddd39cae8c09
8c090348acc5d9aa7. 0348acc5d9aa7.', STARTKEY => '',
ENDKEY => 'row-mdc', ENCODED => 4712495ddd39cae8c090348acc5d9aa7, TABLE =>
{{NAME => '
testtable', FAMILIES => [{NAME =>
'cf1', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION => 'NONE',
VERSIO
NS => '3', TTL => '2147483647',
BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}, {NAME =>
'cf2', BLOO
MFILTER => 'NONE', REPLICATION_SCOPE
=> '0', COMPRESSION => 'NONE', VERSIONS => '3', TTL => '2147483647', BLOCKSIZE
=>
'65536', IN_MEMORY => 'false',
BLOCKCACHE => 'true'}]}}
testtable,row-mdc,1296465498825.f3b822c1 column=info:regioninfo,
timestamp=1296465499372, value=REGION => {NAME =>
'testtable,row-mdc,1296465498825.f3b822c1e314
e31442a0de850d1c2aa5ccec. 42a0de850d1c2aa5ccec.', STARTKEY =>
'row-mdc', ENDKEY => 'row-seq', ENCODED => f3b822c1e31442a0de850d1c2aa5ccec,
TABLE
=> {{NAME => 'testtable', FAMILIES =>
[{NAME => 'cf1', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION
=>
'NONE', VERSIONS => '3', TTL =>
'2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE =>
'true'}, {NAME
=> 'cf2', BLOOMFILTER => 'NONE',
REPLICATION_SCOPE => '0', COMPRESSION => 'NONE', VERSIONS => '3', TTL =>
'2147483647',
BLOCKSIZE => '65536', IN_MEMORY =>
'false', BLOCKCACHE => 'true'}]}}
testtable,row-seq,1296465498825.5f083c64 column=info:regioninfo,
timestamp=1296465802030, value=REGION => {NAME =>
'testtable,row-seq,1296465498825.5f083c641da7
1da708244de17443b88d8df8. 08244de17443b88d8df8.', STARTKEY =>
'row-seq', ENDKEY => '', ENCODED => 5f083c641da708244de17443b88d8df8, OFFLINE
=> tr
ue, SPLIT => true, TABLE => {{NAME =>
'testtable', FAMILIES => [{NAME => 'cf1', BLOOMFILTER => 'NONE',
REPLICATION_SCOP
E => '0', COMPRESSION => 'NONE',
VERSIONS => '3', TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY =>
'false', BLOC
KCACHE => 'true'}, {NAME => 'cf2',
BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION => 'NONE',
VERSIONS =>
'3', TTL => '2147483647', BLOCKSIZE
=> '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}]}}
testtable,row-seq,1296465801544.0b037fd8 column=info:regioninfo,
timestamp=1296465802204, value=REGION => {NAME =>
'testtable,row-seq,1296465801544.0b037fd873a9
73a955a8b813736663a46deb. 55a8b813736663a46deb.', STARTKEY =>
'row-seq', ENDKEY => 'row-vfk', ENCODED => 0b037fd873a955a8b813736663a46deb,
TABLE
=> {{NAME => 'testtable', FAMILIES =>
[{NAME => 'cf1', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION
=>
'NONE', VERSIONS => '3', TTL =>
'2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE =>
'true'}, {NAME
=> 'cf2', BLOOMFILTER => 'NONE',
REPLICATION_SCOPE => '0', COMPRESSION => 'NONE', VERSIONS => '3', TTL =>
'2147483647',
BLOCKSIZE => '65536', IN_MEMORY =>
'false', BLOCKCACHE => 'true'}]}}
testtable,row-vfk,1296465801544.cc8129ba column=info:regioninfo,
timestamp=1296465802204, value=REGION => {NAME =>
'testtable,row-vfk,1296465801544.cc8129ba713c
713ce041892b784398647372. e041892b784398647372.', STARTKEY =>
'row-vfk', ENDKEY => '', ENCODED => cc8129ba713ce041892b784398647372, TABLE =>
{{NA
ME => 'testtable', FAMILIES => [{NAME
=> 'cf1', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION =>
'NONE',
VERSIONS => '3', TTL =>
'2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE =>
'true'}, {NAME => 'cf2
', BLOOMFILTER => 'NONE',
REPLICATION_SCOPE => '0', COMPRESSION => 'NONE', VERSIONS => '3', TTL =>
'2147483647', BLOCKS
IZE => '65536', IN_MEMORY => 'false',
BLOCKCACHE => 'true'}]}}
5 row(s) in 0.1060 seconds
{code}
Note the wrong endkey where the NPE struck. Messy!
> 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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