Nick Travers created KAFKA-5236:
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Summary: Regression in on-disk log size when using Snappy
compression with 0.8.2 log message format
Key: KAFKA-5236
URL: https://issues.apache.org/jira/browse/KAFKA-5236
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 0.10.2.1
Reporter: Nick Travers
We recently upgraded our brokers in our production environments from 0.10.1.1
to 0.10.2.1 and we've noticed a sizable regression in the on-disk .log file
size. For some deployments the increase was as much as 50%.
We run our brokers with the 0.8.2 log message format version. The majority of
our message volume comes from 0.10.x Java clients sending messages encoded with
the Snappy codec.
Some initial testing only shows a regression between the two versions when
using Snappy compression with a log message format of 0.8.2.
I also tested 0.10.x log message formats as well as Gzip compression. The log
sizes do not differ in this case, so the issue seems confined to 0.8.2 message
format and Snappy compression.
A git-bisect lead me to this commit, which modified the server-side
implementation of `Record`:
https://github.com/apache/kafka/commit/67f1e5b91bf073151ff57d5d656693e385726697
Here's the PR, which has more context:
https://github.com/apache/kafka/pull/2140
Here is a link to the test I used to re-producer this issue:
https://github.com/nicktrav/kafka/commit/68e8db4fa525e173651ac740edb270b0d90b8818
cc: [~hachikuji] [~junrao] [~ijuma] [~guozhang] (tagged on original PR)
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