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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2018/11/19 06:06:01 UTC
[jira] [Updated] (CASSANDRA-6794) Optimise slab allocator to enable
higher number of column families
[ https://issues.apache.org/jira/browse/CASSANDRA-6794?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
C. Scott Andreas updated CASSANDRA-6794:
----------------------------------------
Component/s: Core
> Optimise slab allocator to enable higher number of column families
> ------------------------------------------------------------------
>
> Key: CASSANDRA-6794
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6794
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jeremy Hanna
> Priority: Minor
>
> Currently the slab allocator allocates 1MB per column family. This has been very beneficial for gc efficiency. However, it makes it more difficult to have large numbers of column families.
> It would be preferable to have a more intelligent way to allocate slabs so that there is more flexibility between slab allocator and non-slab allocator behaviour.
> A simple first step is to ramp up size of slabs from small (say 8KB) when empty, to 1MB after a few slabs.
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