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https://issues.apache.org/jira/browse/CASSANDRA-1958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979934#action_12979934
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lichenglin commented on CASSANDRA-1958:
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Three nodes and N=3,R=W=2.Get CPU info when we get 10,000 from one key through
JPROFILER.
99.4% - 968 s - 103 inv. java.util.concurrent.ThreadPoolExecutor$Worker.run
99.4% - 968 s - 713 inv. org.apache.cassandra.net.MessageDeliveryTask.run
99.2% - 966 s - 70 inv. org.apache.cassandra.db.ReadVerbHandler.doVerb
99.2% - 966 s - 70 inv. org.apache.cassandra.db.SliceFromReadCommand.getRow
99.2% - 966 s - 70 inv. org.apache.cassandra.db.Table.getRow
99.2% - 966 s - 70 inv.
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily
99.2% - 966 s - 70 inv.
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily
97.8% - 952 s - 70 inv.
org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns
93.6% - 912 s - 70 inv.
org.apache.cassandra.db.filter.QueryFilter.collectCollatedColumns
93.6% - 912 s - 70 inv.
org.apache.cassandra.db.filter.SliceQueryFilter.collectReducedColumns
-75.8% - 739 s - 647,235 inv. java.util.Iterator.hasNext
-75.6% - 736 s - 647,235 inv.
com.google.common.collect.AbstractIterator.hasNext
-75.2% - 733 s - 647,235 inv.
com.google.common.collect.AbstractIterator.tryToComputeNext
-0.1% - 691 ms - 647,235 inv.
com.google.common.base.Preconditions.checkState
-14.5% - 141 s - 647,165 inv.
org.apache.cassandra.db.ColumnFamily.addColumn
Iterator.hasNext cost 75.8%.
> query slow in million columns of one key
> ----------------------------------------
>
> Key: CASSANDRA-1958
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1958
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 0.6.5
> Environment: three nodes with SUSE and 2G JVM.
> Reporter: lichenglin
>
> We get all records in 200 ms with 10,000 columns of one key, but 4 seconds
> with 100,000 columns, and we fear for 1,000,000.
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