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https://issues.apache.org/jira/browse/CASSANDRA-2228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13002197#comment-13002197
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Gary Dusbabek commented on CASSANDRA-2228:
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aha. I was looking in the trunk code (no chance of null). I see the problem in
the 0.7 branch.
> Race conditions when reinitialisating nodes (OOM + Nullpointer)
> ---------------------------------------------------------------
>
> Key: CASSANDRA-2228
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2228
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.7.2
> Reporter: Thibaut
> Assignee: Gary Dusbabek
> Fix For: 0.7.4
>
>
> I had a corrupt system table which wouldn't compact anymore and I deleted the
> files and restarted cassandra and let it take the same token/ip address.
> I experienced the same errors when I'm adding a newly installed node under
> the same token/ip address before calling repair.
> 1)
> After a few seconds/minutes, I get a OOM error:
> INFO [FlushWriter:1] 2011-02-23 16:40:28,958 Memtable.java (line 164)
> Completed flushing /cassandra/data/system/Schema-f-15-Data.db (8037 bytes)
> INFO [MigrationStage:1] 2011-02-23 16:40:28,965 Migration.java (line 133)
> Applying migration 3e30e76b-1e3f-11e0-8369-5a9c1faed4ae Add keyspace:
> table_userentriesrep factor:3rep
> strategy:SimpleStrategy{org.apache.cassandra.config.CFMetaData@58925d9[cfId=1024,tableName=table_userentries,cfName=table_userentries,cfType=Standard,comparator=org.apache.cassandra.db.marshal.BytesType@b44dff0,subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=0.0,gcGraceSeconds=86400,defaultValidator=org.apache.cassandra.db.marshal.BytesType@b44dff0,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=3600,memtableFlushAfterMins=60,memtableThroughputInMb=64,memtableOperationsInMillions=10.0,column_metadata={}],
>
> org.apache.cassandra.config.CFMetaData@11ab7246[cfId=1025,tableName=table_userentries,cfName=table_userentries_meta,cfType=Standard,comparator=org.apache.cassandra.db.marshal.BytesType@b44dff0,subcolumncomparator=<null>,comment=,rowCacheSize=0.0,keyCacheSize=200000.0,readRepairChance=0.0,gcGraceSeconds=86400,defaultValidator=org.apache.cassandra.db.marshal.BytesType@b44dff0,minCompactionThreshold=4,maxCompactionThreshold=32,rowCacheSavePeriodInSeconds=0,keyCacheSavePeriodInSeconds=3600,memtableFlushAfterMins=60,memtableThroughputInMb=64,memtableOperationsInMillions=10.0,column_metadata={}]}
> INFO [MigrationStage:1] 2011-02-23 16:40:28,965 ColumnFamilyStore.java (line
> 666) switching in a fresh Memtable for Migrations at
> CommitLogContext(file='/cassandra/commitlog/CommitLog-1298475572022.log',
> position=226075)
> INFO [MigrationStage:1] 2011-02-23 16:40:28,966 ColumnFamilyStore.java (line
> 977) Enqueuing flush of Memtable-Migrations@2121008793(12529 bytes, 1
> operations)
> INFO [FlushWriter:1] 2011-02-23 16:40:28,966 Memtable.java (line 157)
> Writing Memtable-Migrations@2121008793(12529 bytes, 1 operations)
> INFO [MigrationStage:1] 2011-02-23 16:40:28,966 ColumnFamilyStore.java (line
> 666) switching in a fresh Memtable for Schema at
> CommitLogContext(file='/cassandra/commitlog/CommitLog-1298475572022.log',
> position=226075)
> INFO [MigrationStage:1] 2011-02-23 16:40:28,967 ColumnFamilyStore.java (line
> 977) Enqueuing flush of Memtable-Schema@139610466(8370 bytes, 15 operations)
> INFO [ScheduledTasks:1] 2011-02-23 16:40:28,972 StatusLogger.java (line 89)
> table_sourcedetection.table_sourcedetection 0,0
> 0/0 0/200000
> ERROR [FlushWriter:1] 2011-02-23 16:41:01,240 AbstractCassandraDaemon.java
> (line 114) Fatal exception in thread Thread[FlushWriter:1,5,main]
> java.lang.OutOfMemoryError: Java heap space
> at java.nio.HeapByteBuffer.<init>(HeapByteBuffer.java:39)
> at java.nio.ByteBuffer.allocate(ByteBuffer.java:312)
> at
> org.apache.cassandra.io.util.BufferedRandomAccessFile.<init>(BufferedRandomAccessFile.java:126)
> at
> org.apache.cassandra.io.sstable.SSTableWriter.<init>(SSTableWriter.java:75)
> at
> org.apache.cassandra.db.Memtable.writeSortedContents(Memtable.java:158)
> at org.apache.cassandra.db.Memtable.access$000(Memtable.java:51)
> at org.apache.cassandra.db.Memtable$1.runMayThrow(Memtable.java:176)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> 2) If I restart then, I'm getting an Nullpointer exception. The OOM error
> will only appear once.
> ERROR [main] 2011-02-23 16:42:32,782 AbstractCassandraDaemon.java (line 333)
> Exception encountered during startup.
> java.lang.NullPointerException
> at
> java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> at
> org.apache.cassandra.gms.Gossiper.addLocalApplicationState(Gossiper.java:925)
> at
> org.apache.cassandra.service.MigrationManager.passiveAnnounce(MigrationManager.java:105)
> at
> org.apache.cassandra.service.MigrationManager.applyMigrations(MigrationManager.java:161)
> at
> org.apache.cassandra.service.AbstractCassandraDaemon.setup(AbstractCassandraDaemon.java:185)
> at
> org.apache.cassandra.service.AbstractCassandraDaemon.activate(AbstractCassandraDaemon.java:316)
> at
> org.apache.cassandra.thrift.CassandraDaemon.main(CassandraDaemon.java:79)
> Killing and restarting the node multiple times will eventually "fix" these
> errors.
> Steps to reproduce. Remove complete data directory and restart node with same
> token/ip.
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