GitHub user logarithm opened a pull request:
https://github.com/apache/kafka/pull/580
KAFKA-2882: Add constructor cache for Snappy and LZ4 Output/Input streams
in Compressor.java
In `wrapForOutput` and `wrapForInput` methods of
`org.apache.kafka.common.record.Compressor`, `Class.forName("[compression
codec]")` and `getConstructor` methods are invoked for each `wrapForOutput` /
`wrapForInput` call. Reflection calls are expensive and impact performance at
high volumes. This patch adds a cache for `Constructor` to reduce the
reflection overhead.
In our production deployments, this has reduced producer CPU usage by about
20%
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/metamx/kafka compressor-getclass-cache
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/580.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #580
----
commit 6c05fbd265cd595e1878d12eb2c1cdc838c80b09
Author: Maksim Logvinenko <[email protected]>
Date: 2015-11-24T13:21:09Z
Add cache for constructors in Compressor.java
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
