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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Created: (COMPRESS-83) GzipCompressorOutputStream should forward write(byte[] buf) and write(byte[] buf, int off, int len) to underlying stream
Date Thu, 30 Jul 2009 13:21:14 GMT
GzipCompressorOutputStream should forward write(byte[] buf) and write(byte[] buf, int off,
int len) to underlying stream
------------------------------------------------------------------------------------------------------------------------

                 Key: COMPRESS-83
                 URL: https://issues.apache.org/jira/browse/COMPRESS-83
             Project: Commons Compress
          Issue Type: Improvement
    Affects Versions: 1.0
         Environment: Linux
            Reporter: Aleksey Shipilev


Current version of GzipCompressorOutputStream decorates only write(int b) method for underlying
java.zip.util.GZipOutputStream.

In common scenario of:

OutputStream os = ...;
GzipCompressorOutputStream gcos = new GzipCompressorOutputStream(os);
[do extensive write(byte[] buf]

this results in very slow _unbuffered_ write. This is particularly evident if the code changes
to:

OutputStream os = ...;
GZIPOutputStream gos = new GZIPOutputStream(os);
[do extensive write(byte[] buf]

...which is blazingly faster.

In my environment, packing 100 Mb stream with Commons wrapper takes about 120 seconds, while
using java.util.zip directly takes less than 1 second. 
This performance hit is way too bad for simple wrapper.

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