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From "Aleksey Yeschenko (Jira)" <>
Subject [jira] [Commented] (CASSANDRA-15410) Avoid over-allocation of bytes for UTF8 string serialization
Date Tue, 19 Nov 2019 16:13:00 GMT


Aleksey Yeschenko commented on CASSANDRA-15410:

Committed to {{trunk}} as [647bdd6a11970f80666d7f20b53af76fbda4ff14|],
thanks. Made just one tiny tweak: switched encoding of UDT names and field types to ascii
strings as well.

> Avoid over-allocation of bytes for UTF8 string serialization 
> -------------------------------------------------------------
>                 Key: CASSANDRA-15410
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Messaging/Client
>            Reporter: Yifan Cai
>            Assignee: Yifan Cai
>            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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