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https://issues.apache.org/jira/browse/CASSANDRA-15410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974417#comment-16974417
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Yifan Cai commented on CASSANDRA-15410:
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[~aleksey] thanks for reviewing.
Understood the concern here. It assumes the method is/will be only used in the
scenarios such as encoding message.
We can have a separate method that explicitly takes the argument of reserved
size, if encodeSize is a strong constraint and correct for message
serialization, so it can be relied on. There is a big performance difference
calculating the size and skipping calculation. Especially for the long strings,
the time taken of the prior is 2x than the latter one.
> 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: 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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