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https://issues.apache.org/jira/browse/CASSANDRA-8757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318575#comment-14318575
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Benedict commented on CASSANDRA-8757:
-------------------------------------
Patch available
[here|github.com/belliottsmith/cassandra/tree/8757-offheapsummarybuilder]
The approach is pretty straight forward in principle: we split the offheap
memory for the summary into two allocations, the summary offsets and the
summary entries - the latter composed of the key and its offset in the index
file. The offsets index from zero now, instead of from the end of the offsets
themselves, and so to maintain compatibility we do not change the serialization
format, on read/write we simply subtract/add the necessary offset. This split
permits us to have a separate chunk of memory for each that we can append to in
the writer, so that a prefix of both can be used to open a summary before we've
finished writing. This permits us to share memory between all early instances
of a table.
> IndexSummaryBuilder should construct itself offheap, and share memory between
> the result of each build() invocation
> -------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-8757
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8757
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Benedict
> Assignee: Benedict
> Fix For: 2.1.4
>
>
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