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https://issues.apache.org/jira/browse/CASSANDRA-4687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13737539#comment-13737539
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Balázs Póka commented on CASSANDRA-4687:
----------------------------------------
Yes, compaction_preheat_key_cache is set to true.
The migration program is a custom, multithreaded Java program which only
inserts CQL3 "records" (using Datastax' Java core driver, see
https://github.com/datastax/java-driver) into column families with this schema:
create table data (key int, partitiontime bigint, begintime bigint, event
varchar, data blob, primary key((key, partitiontime), event, begintime))
cfstats:
SSTable count: 5
Space used (live): 1703574891
Space used (total): 1703575005
Number of Keys (estimate): 11776
Memtable Columns Count: 24
Memtable Data Size: 6572
Memtable Switch Count: 3
Read Count: 814
Read Latency: 2.128 ms.
Write Count: 274
Write Latency: 0.046 ms.
Pending Tasks: 0
Bloom Filter False Positives: 0
Bloom Filter False Ratio: 0.00000
Bloom Filter Space Used: 16456
Compacted row minimum size: 180
Compacted row maximum size: 2346799
Compacted row mean size: 121112
> Exception: DecoratedKey(xxx, yyy) != DecoratedKey(zzz, kkk)
> -----------------------------------------------------------
>
> Key: CASSANDRA-4687
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4687
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: CentOS 6.3 64-bit, Oracle JRE 1.6.0.33 64-bit, single
> node cluster
> Reporter: Leonid Shalupov
> Priority: Minor
> Attachments: 4687-debugging.txt
>
>
> Under heavy write load sometimes cassandra fails with assertion error.
> git bisect leads to commit 295aedb278e7a495213241b66bc46d763fd4ce66.
> works fine if global key/row caches disabled in code.
> {quote}
> java.lang.AssertionError: DecoratedKey(xxx, yyy) != DecoratedKey(zzz, kkk) in
> /var/lib/cassandra/data/...-he-1-Data.db
> at
> org.apache.cassandra.db.columniterator.SSTableSliceIterator.<init>(SSTableSliceIterator.java:60)
> at
> org.apache.cassandra.db.filter.SliceQueryFilter.getSSTableColumnIterator(SliceQueryFilter.java:67)
> at
> org.apache.cassandra.db.filter.QueryFilter.getSSTableColumnIterator(QueryFilter.java:79)
> at
> org.apache.cassandra.db.CollationController.collectAllData(CollationController.java:256)
> at
> org.apache.cassandra.db.CollationController.getTopLevelColumns(CollationController.java:64)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1345)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1207)
> at
> org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1142)
> at org.apache.cassandra.db.Table.getRow(Table.java:378)
> at
> org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:69)
> at
> org.apache.cassandra.service.StorageProxy$LocalReadRunnable.runMayThrow(StorageProxy.java:819)
> at
> org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:1253)
> 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)
> {quote}
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