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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