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https://issues.apache.org/jira/browse/CASSANDRA-6841?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935382#comment-13935382
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Jonathan Ellis commented on CASSANDRA-6841:
-------------------------------------------
committed. might want to doublecheck my merge to 2.1; i kept the changes to
Schema but the CL changes looked irrelevant
> ConcurrentModificationException in commit-log-writer after local schema reset
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-6841
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6841
> Project: Cassandra
> Issue Type: Bug
> Environment: Linux 3.2.0 (Debian Wheezy) Cassandra 2.0.6, Oracle JVM
> 1.7.0_51
> Almost default cassandra.yaml (IPs and cluster name changed)
> This is the 2nd node in a 2-node ring. It has ~2500 keyspaces and very low
> traffic. (Only new keyspaces see reads and writes.)
> Reporter: Pas
> Assignee: Benedict
> Priority: Minor
> Fix For: 2.0.7, 2.1 beta2
>
>
> {code}
> INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,013
> MigrationManager.java (line 329) Starting local schema reset...
> INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,016
> ColumnFamilyStore.java (line 785) Enqueuing flush of
> Memtable-local@394448776(114/1140 serialized/live bytes, 3 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,016 Memtable.java (line 331)
> Writing Memtable-local@394448776(114/1140 serialized/live bytes, 3 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,182 Memtable.java (line 371)
> Completed flushing
> /var/lib/cassandra/data/system/local/system-local-jb-398-Data.db (145 bytes)
> for commitlog position ReplayPosition(segmentId=1394620057452,
> position=33159822)
> INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,185
> ColumnFamilyStore.java (line 785) Enqueuing flush of
> Memtable-local@1087210140(62/620 serialized/live bytes, 1 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,185 Memtable.java (line 331)
> Writing Memtable-local@1087210140(62/620 serialized/live bytes, 1 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,357 Memtable.java (line 371)
> Completed flushing
> /var/lib/cassandra/data/system/local/system-local-jb-399-Data.db (96 bytes)
> for commitlog position ReplayPosition(segmentId=1394620057452,
> position=33159959)
> INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,361
> ColumnFamilyStore.java (line 785) Enqueuing flush of
> Memtable-local@768887091(62/620 serialized/live bytes, 1 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,361 Memtable.java (line 331)
> Writing Memtable-local@768887091(62/620 serialized/live bytes, 1 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,516 Memtable.java (line 371)
> Completed flushing
> /var/lib/cassandra/data/system/local/system-local-jb-400-Data.db (96 bytes)
> for commitlog position ReplayPosition(segmentId=1394620057452,
> position=33160096)
> INFO [CompactionExecutor:38] 2014-03-12 11:37:54,517 CompactionTask.java
> (line 115) Compacting
> [SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-398-Data.db'),
>
> SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-400-Data.db'),
>
> SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-399-Data.db'),
>
> SSTableReader(path='/var/lib/cassandra/data/system/local/system-local-jb-397-Data.db')]
> INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,519
> ColumnFamilyStore.java (line 785) Enqueuing flush of
> Memtable-local@271993477(62/620 serialized/live bytes, 1 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,519 Memtable.java (line 331)
> Writing Memtable-local@271993477(62/620 serialized/live bytes, 1 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:54,794 Memtable.java (line 371)
> Completed flushing
> /var/lib/cassandra/data/system/local/system-local-jb-401-Data.db (96 bytes)
> for commitlog position ReplayPosition(segmentId=1394620057452,
> position=33160233)
> INFO [RMI TCP Connection(38)-192.168.36.171] 2014-03-12 11:37:54,799
> MigrationManager.java (line 357) Local schema reset is complete.
> INFO [CompactionExecutor:38] 2014-03-12 11:37:54,848 CompactionTask.java
> (line 275) Compacted 4 sstables to
> [/var/lib/cassandra/data/system/local/system-local-jb-402,]. 6,099 bytes to
> 5,821 (~95% of original) in 330ms = 0.016822MB/s. 4 total partitions merged
> to 1. Partition merge counts were {4:1, }
> INFO [OptionalTasks:1] 2014-03-12 11:37:55,110 ColumnFamilyStore.java (line
> 785) Enqueuing flush of
> Memtable-schema_columnfamilies@106276050(181506/509164 serialized/live bytes,
> 3276 ops)
> INFO [FlushWriter:6] 2014-03-12 11:37:55,110 Memtable.java (line 331)
> Writing Memtable-schema_columnfamilies@106276050(181506/509164
> serialized/live bytes, 3276 ops)
> INFO [OptionalTasks:1] 2014-03-12 11:37:55,110 ColumnFamilyStore.java (line
> 785) Enqueuing flush of Memtable-schema_columns@252242773(185191/630698
> serialized/live bytes, 3614 ops)
> ERROR [COMMIT-LOG-WRITER] 2014-03-12 11:37:55,111 CassandraDaemon.java (line
> 196) Exception in thread Thread[COMMIT-LOG-WRITER,5,main]
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
> at java.util.HashMap$KeyIterator.next(HashMap.java:960)
> at
> org.apache.cassandra.db.commitlog.CommitLogAllocator.flushOldestKeyspaces(CommitLogAllocator.java:309)
> at
> org.apache.cassandra.db.commitlog.CommitLogAllocator.fetchSegment(CommitLogAllocator.java:147)
> at
> org.apache.cassandra.db.commitlog.CommitLog.activateNextSegment(CommitLog.java:299)
> at
> org.apache.cassandra.db.commitlog.CommitLog.access$100(CommitLog.java:49)
> at
> org.apache.cassandra.db.commitlog.CommitLog$LogRecordAdder.run(CommitLog.java:350)
> at
> org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService$1.runMayThrow(PeriodicCommitLogExecutorService.java:51)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> at java.lang.Thread.run(Thread.java:744)
> {code}
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