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https://issues.apache.org/jira/browse/CASSANDRA-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092600#comment-13092600
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Yang Yang edited comment on CASSANDRA-2252 at 8/29/11 2:33 AM:
---------------------------------------------------------------
"if it's a memtable-related operation" ---- but CounterContext.allocate
produces a ByteBuffer , some of which goes into CounterColumn, hence Memtable,
it seems.
for example:
CounterMutation.computeShardMerger() ==> CounterColumn.computeOldShardMerger()
===> ByteBuffer contextManager.computeOldShardMerger {
......
ContextState merger = ContextState.allocate(2, nbDelta,
HeapAllocator.instance);
....
return merger.context;
}
the "merger.context" is a ByteBuffer that is inserted into CounterColumn by
CounterColumn.computeOldShardMerger()
Thanks
Yang
was (Author: yangyangyyy):
"if it's a memtable-related operation" ---- CounterContext.allocate
produces a ByteBuffer , some of which goes into CounterColumn, hence Memtable,
it seems.
for example:
CounterMutation.computeShardMerger() ==> CounterColumn.computeOldShardMerger()
===> ByteBuffer contextManager.computeOldShardMerger {
......
ContextState merger = ContextState.allocate(2, nbDelta,
HeapAllocator.instance);
....
return merger.context;
}
the "merger.context" is a ByteBuffer that is inserted into CounterColumn by
CounterColumn.computeOldShardMerger()
Thanks
Yang
> arena allocation for memtables
> ------------------------------
>
> Key: CASSANDRA-2252
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2252
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Fix For: 1.0
>
> Attachments: 0001-add-MemtableAllocator.txt,
> 0002-add-off-heap-MemtableAllocator-support.txt, 2252-v3.txt, 2252-v4.txt,
> merged-2252.tgz
>
>
> The memtable design practically actively fights Java's GC design. Todd
> Lipcon gave a good explanation over on HBASE-3455.
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