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Posted to issues@spark.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2018/02/07 02:41:00 UTC
[jira] [Created] (SPARK-23347) Introduce buffer between Java data
stream and gzip stream
Ted Yu created SPARK-23347:
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Summary: 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
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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