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https://issues.apache.org/jira/browse/CASSANDRA-20760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitry Konstantinov updated CASSANDRA-20760:
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Description:
Currently within org.apache.cassandra.db.memtable.TrieMemtable#getFlushSet we
iterate over all partitions to retrieve partition key sizes by constructing
byte[] for every partition key.
We can do a similar kind of traversal logic but only count bytes instead of
allocating and filling byte[] values. Additionally, we can skip token bytes
instead of parsing them.
!cpu_profile_before.png|width=1000!
was:
Currently within org.apache.cassandra.db.memtable.TrieMemtable#getFlushSet we
iterate over all partitions to retrieve partition key sizes by constructing
byte[] for every partition key.
We can do a similar kind of traversal logic but only count bytes instead of
allocating and filling byte[] values. Additionally, we can skip token bytes
instead of parsing them.
!cpu_profile_before.png! |width=1000!
> Optimize calculating of partition key sizes in TrieMemtable#getFlushSet
> -----------------------------------------------------------------------
>
> Key: CASSANDRA-20760
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20760
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 5.x
>
> Attachments: cpu_profile_after.png, cpu_profile_before.png
>
>
> Currently within org.apache.cassandra.db.memtable.TrieMemtable#getFlushSet we
> iterate over all partitions to retrieve partition key sizes by constructing
> byte[] for every partition key.
> We can do a similar kind of traversal logic but only count bytes instead of
> allocating and filling byte[] values. Additionally, we can skip token bytes
> instead of parsing them.
> !cpu_profile_before.png|width=1000!
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