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Posted to commits@cassandra.apache.org by "Aleksey Yeschenko (Jira)" <ji...@apache.org> on 2019/11/12 16:42:00 UTC
[jira] [Updated] (CASSANDRA-15410) Avoid over-allocation of bytes
for UTF8 string serialization
[ https://issues.apache.org/jira/browse/CASSANDRA-15410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksey Yeschenko updated CASSANDRA-15410:
------------------------------------------
Change Category: Performance
Complexity: Low Hanging Fruit
Fix Version/s: 4.0
Reviewers: Aleksey Yeschenko
Status: Open (was: Triage Needed)
> Avoid over-allocation of bytes for UTF8 string serialization
> -------------------------------------------------------------
>
> Key: CASSANDRA-15410
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15410
> Project: Cassandra
> Issue Type: Improvement
> Components: Messaging/Client
> Reporter: Yifan Cai
> Assignee: Abhishek Singh
> Priority: Normal
> Fix For: 4.0
>
>
> In the current message encoding implementation, it first calculates the `encodeSize` and allocates the bytebuffer with that size.
> However, during encoding, it assumes the worst case of writing UTF8 string to allocate bytes, i.e. assuming each letter takes 3 bytes.
> The over-estimation further leads to resizing the underlying array and data copy.
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