[
https://issues.apache.org/jira/browse/CASSANDRA-4858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vijay reopened CASSANDRA-4858:
------------------------------
This patch causes
{code}
ERROR [ReadStage:80] 2013-01-17 14:48:54,829 CassandraDaemon.java (line 133)
Exception in thread Thread[ReadStage:80,5,main]
java.lang.AssertionError: (max(0),max(0)]
at
org.apache.cassandra.db.ColumnFamilyStore.getSequentialIterator(ColumnFamilyStore.java:1352)
at
org.apache.cassandra.db.ColumnFamilyStore.getRangeSlice(ColumnFamilyStore.java:1411)
at
org.apache.cassandra.service.RangeSliceVerbHandler.executeLocally(RangeSliceVerbHandler.java:46)
at
org.apache.cassandra.service.StorageProxy$LocalRangeSliceRunnable.runMayThrow(StorageProxy.java:1077)
at
org.apache.cassandra.service.StorageProxy$DroppableRunnable.run(StorageProxy.java:1562)
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:680)
{code}
Because the range merge merges Ranges like:
{code}
[(max(0),max(88065836015670275036743470843252762100)],
(max(88065836015670275036743470843252762100),min(-1)], (min(-1),max(0)]]
{code}
to
{code}
(max(0),max(0)]
{code}
> Coverage analysis for low-CL queries
> ------------------------------------
>
> Key: CASSANDRA-4858
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4858
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Sylvain Lebresne
> Fix For: 1.2.1
>
> Attachments: 0001-CASSANDRA-4858.patch, 0001-CASSANDRA-4858-v2.patch,
> 4858-cleanup.txt, 4858-v3-1.txt, 4858-v3-2.txt, 4858-v4.txt
>
>
> There are many cases where getRangeSlice creates more
> RangeSliceCommand than it should, because it always creates one for each range
> returned by getRestrictedRange. Especially for CL.ONE this does not take
> the replication factor into account and is potentially pretty wasteful.
> A range slice at CL.ONE on a 3 node cluster with RF=3 should only
> ever create one RangeSliceCommand.
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