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Increase the GZip DeflaterOutputStream buffer size to increase performance #36818

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Merged
scwhittle merged 2 commits into from
Nov 18, 2025
Merged

Increase the GZip DeflaterOutputStream buffer size to increase performance #36818

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Increase the GZip DeflaterOutputStream buffer size to increase perfor…
scwhittle Nov 14, 2025
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scwhittle Nov 17, 2025
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4 changes: 3 additions & 1 deletion sdks/java/core/src/main/java/org/apache/beam/sdk/io/Compression.java
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Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,9 @@ public ReadableByteChannel readDecompressed(ReadableByteChannel channel) throws

@Override
public WritableByteChannel writeCompressed(WritableByteChannel channel) throws IOException {
return Channels.newChannel(new GZIPOutputStream(Channels.newOutputStream(channel), true));
// Increase the default deflate output stream buffer size from 512 to 4096 for performance.
return Channels.newChannel(
new GZIPOutputStream(Channels.newOutputStream(channel), 4096, true));
}
},

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