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https://issues.apache.org/jira/browse/KAFKA-7454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16631981#comment-16631981
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ASF GitHub Bot commented on KAFKA-7454:
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rajinisivaram opened a new pull request #5713: KAFKA-7454: Use lazy allocation
for SslTransportLayer buffers
URL: https://github.com/apache/kafka/pull/5713
### Committer Checklist (excluded from commit message)
- [ ] Verify design and implementation
- [ ] Verify test coverage and CI build status
- [ ] Verify documentation (including upgrade notes)
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> Use lazy allocation for SslTransportLayer buffers
> -------------------------------------------------
>
> Key: KAFKA-7454
> URL: https://issues.apache.org/jira/browse/KAFKA-7454
> Project: Kafka
> Issue Type: Improvement
> Components: security
> Affects Versions: 0.11.0.3, 1.0.2, 1.1.1, 2.0.0
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Priority: Major
> Fix For: 2.1.0
>
>
> At the moment, three heap buffers are allocated for SslTransportLayers at the
> time when the instance is created (before establishing the connection on the
> client-side and when accepting the connection on the broker-side). When there
> are a large number of connections and the broker is overloaded, this can
> result in unnecessary memory pressure on the broker due to client
> reconnections since buffers may be allocated unnecessarily for client
> connections whose handshake is never processed. It will be better to lazily
> allocate buffers to reduce memory pressure. On the broker-side, buffers will
> be allocated when the first packet is received from the client, starting
> handshake. On the client-side, buffers will be allocated once the connection
> is established when the client initiates handshake.
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