Nikolai Grigoriev created CASSANDRA-5767:
--------------------------------------------
Summary: NPE under load
Key: CASSANDRA-5767
URL: https://issues.apache.org/jira/browse/CASSANDRA-5767
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 1.2.6
Reporter: Nikolai Grigoriev
I am new to Cassandra so my report may not contain enough relevant information.
I am trying to use Cassandra as backend storage for Titan graph DB. I am
running a simple test on a small cluster of 4 Cassandra nodes (1.2.6 all of
them, running from scratch). I can consistently get this exception that makes
Cassandra unusable:
{code}
INFO [FlushWriter:38] 2013-07-16 23:28:37,246 Memtable.java (line 461) Writing
Memtable-schema_columnfamilies@1756904544(1291/1291 serialized/live bytes, 21
ops)
INFO [FlushWriter:38] 2013-07-16 23:28:37,395 Memtable.java (line 495)
Completed flushing
/hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnf
amilies-ic-284-Data.db (701 bytes) for commitlog position
ReplayPosition(segmentId=1374015168706, position=2927400)
INFO [CompactionExecutor:188] 2013-07-16 23:28:37,396 CompactionTask.java
(line 105) Compacting
[SSTableReader(path='/hadoop/disk4/cassandra/data/system/schema_columnfam
ilies/system-schema_columnfamilies-ic-281-Data.db'),
SSTableReader(path='/hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ic-284-Dat
a.db'),
SSTableReader(path='/hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ic-283-Data.db'),
SSTableReader(path='/hadoop/disk4/cas
sandra/data/system/schema_columnfamilies/system-schema_columnfamilies-ic-282-Data.db')]
ERROR [MigrationStage:1] 2013-07-16 23:28:37,405 CassandraDaemon.java (line
192) Exception in thread Thread[MigrationStage:1,5,main]
java.lang.NullPointerException
at
org.apache.cassandra.db.DefsTable.mergeColumnFamilies(DefsTable.java:476)
at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:355)
at
org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:55)
at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
INFO [CompactionExecutor:188] 2013-07-16 23:28:37,580 CompactionTask.java
(line 262) Compacted 4 sstables to
[/hadoop/disk4/cassandra/data/system/schema_columnfamilies/s
ystem-schema_columnfamilies-ic-285,]. 7,059 bytes to 5,801 (~82% of original)
in 184ms = 0.030067MB/s. 8 total rows, 5 unique. Row merge counts were {1:4,
2:0, 3:0, 4:
1, }
INFO [MigrationStage:1] 2013-07-16 23:28:42,595 ColumnFamilyStore.java (line
630) Enqueuing flush of Memtable-schema_columnfamilies@1684657235(1207/1207
serialized/live
bytes, 21 ops)
INFO [FlushWriter:39] 2013-07-16 23:28:42,596 Memtable.java (line 461) Writing
Memtable-schema_columnfamilies@1684657235(1207/1207 serialized/live bytes, 21
ops)
INFO [FlushWriter:39] 2013-07-16 23:28:42,787 Memtable.java (line 495)
Completed flushing
/hadoop/disk4/cassandra/data/system/schema_columnfamilies/system-schema_columnf
amilies-ic-286-Data.db (699 bytes) for commitlog position
ReplayPosition(segmentId=1374015168706, position=2929541)
ERROR [MigrationStage:1] 2013-07-16 23:28:42,796 CassandraDaemon.java (line
192) Exception in thread Thread[MigrationStage:1,5,main]
java.lang.NullPointerException
at
org.apache.cassandra.db.DefsTable.mergeColumnFamilies(DefsTable.java:476)
at org.apache.cassandra.db.DefsTable.mergeSchema(DefsTable.java:355)
at
org.apache.cassandra.db.DefinitionsUpdateVerbHandler$1.runMayThrow(DefinitionsUpdateVerbHandler.java:55)
at
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
INFO [MemoryMeter:1] 2013-07-16 23:28:58,908 Memtable.java (line 238)
CFS(Keyspace='mykeyspace', ColumnFamily='edgestore') liveRatio is
9.582214511662903 (just-counted w
as 9.582214511662903). calculation took 136930ms for 18075721 columns
INFO [MemoryMeter:1] 2013-07-16 23:29:14,208 Memtable.java (line 238)
CFS(Keyspace='mykeyspace', ColumnFamily='vertexindex') liveRatio is
36.198425299625 (just-counted w
as 36.198425299625). calculation took 15300ms for 720565 columns
{code}
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