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https://issues.apache.org/jira/browse/SPARK-23347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16354962#comment-16354962
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Sean Owen commented on SPARK-23347:
-----------------------------------
Well, that would depend on what Jackson does, and that's buried pretty deep,
but I'd guess it's the smart thing. The efficiency of serializing 4 bytes just
can't vary that much though.
As I say, GZipOutputStream is already buffered; why would an extra buffer help?
> Introduce buffer between Java data stream and gzip stream
> ---------------------------------------------------------
>
> Key: SPARK-23347
> URL: https://issues.apache.org/jira/browse/SPARK-23347
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.2.0
> Reporter: Ted Yu
> Priority: Minor
>
> Currently GZIPOutputStream is used directly around ByteArrayOutputStream
> e.g. from KVStoreSerializer :
> {code}
> ByteArrayOutputStream bytes = new ByteArrayOutputStream();
> GZIPOutputStream out = new GZIPOutputStream(bytes);
> {code}
> This seems inefficient.
> GZIPOutputStream does not implement the write(byte) method. It only provides
> a write(byte[], offset, len) method, which calls the corresponding JNI zlib
> function.
> BufferedOutputStream can be introduced wrapping GZIPOutputStream for better
> performance.
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