[ https://issues.apache.org/jira/browse/CASSANDRA-15410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974417#comment-16974417 ]
Yifan Cai commented on CASSANDRA-15410: --------------------------------------- [~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. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org