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Replace implementation with Aircompressor code
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The core compression and decompression code has been replaced with the
latest code from Aircompressor. The existing interfaces have been
retained where possible. The notable exception is the deprecated
SnappyInputStream and SnappyOutputStream output stream implementations
have been removed. Any existing data in these formats should be
converted to the specification defined framed formats using an
older version of this library.
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@dain
dain committed May 21, 2024
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19 changes: 19 additions & 0 deletions .github/workflows/main.yml
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name: ci

on:
- push
- pull_request

jobs:
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v1
- uses: actions/setup-java@v3
with:
distribution: 'temurin'
java-version: 8
- name: Maven Install
run: mvn install -B -V -DskipTests -Dair.check.skip-all
- name: Maven Tests
run: mvn install -B -P ci
216 changes: 0 additions & 216 deletions README.md
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# 🚚 MOVED 🚚

### __Future development of Snappy without JNI has moved to [aircompressor](https://github.com/airlift/aircompressor)__

</br>

# Snappy in Java

This is a rewrite (port) of [Snappy](http://code.google.com/p/snappy/) written in
pure Java. This compression code produces a byte-for-byte exact copy of the output
created by the original C++ code, and extremely fast.

# Performance

The Snappy micro-benchmark has been ported, and can be used to measure
the performance of this code against the excellent Snappy JNI wrapper from
[xerial](http://code.google.com/p/snappy-java/). As you can see in the results
below, the pure Java port is 20-30% faster for block compress, 0-10% slower
for block uncompress, and 0-5% slower for round-trip block compression. These
results were run with Java 7 on a Core i7, 64-bit Mac.

As a second more independent test, the performance has been measured using the
Ning JVM compression benchmark against Snappy JNI, and the pure Java
[Ning LZF](https://github.com/ning/compress) codec. The
[results](http://dain.github.com/snappy/) show that the pure Java Snappy is
20-30% faster than JNI Snappy for compression, and is typically 10-20% slower
for decompression. Both, the pure Java Snappy and JNI Snappy implementations
are faster that the Ning LZF codec. These results were run with Java 6 on a
Core i7, 64-bit Mac.

The difference in performance between these two tests is due to the difference
in JVM version; Java 7 is consistently 5-10% faster than Java 6 in the
compression code. As with all benchmarks your mileage will vary, so test with
your actual use case.



### Block Compress
<pre><code>
JNI Java JNI Java
Input Size Compress Compress Throughput Throughput Change
---------------------------------------------------------------------
html 102400 76.4% 76.4% 294.9MB/s 384.8MB/s +30.5% html
urls 702087 49.1% 49.1% 178.7MB/s 226.5MB/s +26.8% urls
jpg 126958 0.1% 0.1% 2.7GB/s 3.2GB/s +17.4% jpg (not compressible)
pdf 94330 17.9% 17.9% 642.4MB/s 910.3MB/s +41.7% pdf
html4 409600 76.4% 76.4% 289.2MB/s 377.3MB/s +30.5% html4
cp 24603 51.9% 51.9% 166.4MB/s 233.7MB/s +40.5% cp
c 11150 57.6% 57.6% 177.1MB/s 295.4MB/s +66.8% c
lsp 3721 51.6% 51.6% 245.5MB/s 278.0MB/s +13.2% lsp
xls 1029744 58.7% 58.7% 263.0MB/s 292.5MB/s +11.2% xls
txt1 152089 40.2% 40.2% 116.8MB/s 163.1MB/s +39.7% txt1
txt2 125179 35.9% 35.9% 112.5MB/s 153.4MB/s +36.3% txt2
txt3 426754 42.9% 42.9% 123.3MB/s 169.8MB/s +37.6% txt3
txt4 481861 31.7% 31.7% 107.8MB/s 146.2MB/s +35.6% txt4
bin 513216 81.8% 81.8% 413.1MB/s 497.8MB/s +20.5% bin
sum 38240 48.1% 48.1% 162.4MB/s 213.9MB/s +31.7% sum
man 4227 40.6% 40.6% 194.6MB/s 241.7MB/s +24.2% man
pb 118588 76.8% 76.8% 363.7MB/s 450.3MB/s +23.8% pb
gaviota 184320 61.7% 61.7% 166.7MB/s 253.7MB/s +52.2% gaviota
</code></pre>


### Block Uncompress
<pre><code>
JNI Java JNI Java
Input Size Compress Compress Throughput Throughput Change
---------------------------------------------------------------------
html 102400 76.4% 76.4% 1.5GB/s 1.3GB/s -12.2% html
urls 702087 49.1% 49.1% 969.2MB/s 827.5MB/s -14.6% urls
jpg 126958 0.1% 0.1% 18.6GB/s 19.4GB/s +4.2% jpg (not compressible)
pdf 94330 17.9% 17.9% 4.1GB/s 3.7GB/s -8.8% pdf
html4 409600 76.4% 76.4% 1.5GB/s 1.2GB/s -16.8% html4
cp 24603 51.9% 51.9% 965.2MB/s 956.0MB/s -1.0% cp
c 11150 57.6% 57.6% 989.1MB/s 924.9MB/s -6.5% c
lsp 3721 51.6% 51.6% 991.6MB/s 964.8MB/s -2.7% lsp
xls 1029744 58.7% 58.7% 798.4MB/s 747.3MB/s -6.4% xls
txt1 152089 40.2% 40.2% 643.8MB/s 580.8MB/s -9.8% txt1
txt2 125179 35.9% 35.9% 610.0MB/s 549.6MB/s -9.9% txt2
txt3 426754 42.9% 42.9% 683.8MB/s 614.4MB/s -10.2% txt3
txt4 481861 31.7% 31.7% 565.4MB/s 505.5MB/s -10.6% txt4
bin 513216 81.8% 81.8% 1.5GB/s 1.2GB/s -20.4% bin
sum 38240 48.1% 48.1% 838.1MB/s 771.6MB/s -7.9% sum
man 4227 40.6% 40.6% 856.9MB/s 847.2MB/s -1.1% man
pb 118588 76.8% 76.8% 1.7GB/s 1.5GB/s -12.9% pb
gaviota 184320 61.7% 61.7% 769.1MB/s 693.4MB/s -9.9% gaviota
</code></pre>


### Block Round Trip
<pre><code>
JNI Java JNI Java
Input Size Compress Compress Throughput Throughput Change
---------------------------------------------------------------------
html 102400 76.4% 76.4% 300.3MB/s 287.1MB/s -4.4% html
urls 702087 49.1% 49.1% 182.7MB/s 177.0MB/s -3.2% urls
jpg 126958 0.1% 0.1% 2.6GB/s 2.6GB/s +1.1% jpg (not compressible)
pdf 94330 17.9% 17.9% 695.3MB/s 680.0MB/s -2.2% pdf
html4 409600 76.4% 76.4% 296.4MB/s 282.1MB/s -4.8% html4
cp 24603 51.9% 51.9% 177.0MB/s 172.5MB/s -2.5% cp
c 11150 57.6% 57.6% 221.7MB/s 218.3MB/s -1.5% c
lsp 3721 51.6% 51.6% 217.3MB/s 216.3MB/s -0.5% lsp
xls 1029744 58.7% 58.7% 213.3MB/s 209.9MB/s -1.6% xls
txt1 152089 40.2% 40.2% 129.4MB/s 126.3MB/s -2.4% txt1
txt2 125179 35.9% 35.9% 121.7MB/s 118.8MB/s -2.4% txt2
txt3 426754 42.9% 42.9% 135.2MB/s 132.8MB/s -1.8% txt3
txt4 481861 31.7% 31.7% 115.2MB/s 113.0MB/s -1.9% txt4
bin 513216 81.8% 81.8% 371.2MB/s 350.7MB/s -5.5% bin
sum 38240 48.1% 48.1% 164.2MB/s 160.0MB/s -2.6% sum
man 4227 40.6% 40.6% 184.8MB/s 185.3MB/s +0.3% man
pb 118588 76.8% 76.8% 344.1MB/s 326.3MB/s -5.2% pb
gaviota 184320 61.7% 61.7% 188.0MB/s 185.2MB/s -1.5% gaviota
</code></pre>

# Stream Format

There is no defined stream format for Snappy, but there is an effort to create
a common format with the Google Snappy project.

The stream format used in this library has a couple of unique features not
found in the other Snappy stream formats. Like the other formats, the user
input is broken into blocks and each block is compressed. If the compressed
block is smaller that the user input, the compressed block is written,
otherwise the uncompressed original is written. This dramatically improves the
speed of uncompressible input such as JPG images. Additionally, a checksum of
the user input data for each block is written to the stream. This safety check
assures that the stream has not been corrupted in transit or by a bad Snappy
implementation. Finally, like gzip, compressed Snappy files can be
concatenated together without issue, since the input stream will ignore a
Snappy stream header in the middle of a stream. This makes combining files in
Hadoop and S3 trivial.

The the SnappyOutputStream javadocs contain formal definition of the stream
format.

## Stream Performance

The streaming mode performance can not be directly compared to other
compression algorithms since most formats do not contain a checksum. The basic
streaming code is significantly faster that the Snappy JNI library due to
the completely unoptimized stream implementation in Snappy JNI, but once the
check sum is enabled the performance drops off by about 20%.

### Stream Compress (no checksums)
<pre><code>
JNI Java JNI Java
Input Size Compress Compress Throughput Throughput Change
---------------------------------------------------------------------
html 102400 76.4% 76.4% 275.8MB/s 373.5MB/s +35.4% html
urls 702087 49.1% 49.1% 176.5MB/s 225.2MB/s +27.6% urls
jpg 126958 0.1% -0.0% 1.7GB/s 2.0GB/s +15.8% jpg (not compressible)
pdf 94330 17.8% 16.0% 557.2MB/s 793.2MB/s +42.4% pdf
html4 409600 76.4% 76.4% 281.0MB/s 369.9MB/s +31.7% html4
cp 24603 51.8% 51.8% 151.7MB/s 214.3MB/s +41.3% cp
c 11150 57.4% 57.5% 149.1MB/s 243.3MB/s +63.1% c
lsp 3721 51.1% 51.2% 141.3MB/s 181.1MB/s +28.2% lsp
xls 1029744 58.6% 58.6% 253.9MB/s 290.5MB/s +14.4% xls
txt1 152089 40.2% 40.2% 114.8MB/s 159.4MB/s +38.8% txt1
txt2 125179 35.9% 35.9% 110.0MB/s 150.4MB/s +36.7% txt2
txt3 426754 42.9% 42.9% 121.0MB/s 167.9MB/s +38.8% txt3
txt4 481861 31.6% 31.6% 105.1MB/s 143.2MB/s +36.2% txt4
bin 513216 81.8% 81.8% 387.7MB/s 484.5MB/s +25.0% bin
sum 38240 48.1% 48.1% 153.0MB/s 203.1MB/s +32.8% sum
man 4227 40.2% 40.3% 125.9MB/s 171.9MB/s +36.5% man
pb 118588 76.8% 76.8% 342.2MB/s 431.4MB/s +26.1% pb
gaviota 184320 61.7% 61.7% 161.1MB/s 246.1MB/s +52.7% gaviota
</code></pre>


### Stream Uncompress (no checksums)
<pre><code>
JNI Java JNI Java
Input Size Compress Compress Throughput Throughput Change
---------------------------------------------------------------------
html 102400 76.4% 76.4% 1.2GB/s 1.2GB/s +0.4% html
urls 702087 49.1% 49.1% 853.9MB/s 786.6MB/s -7.9% urls
jpg 126958 0.1% -0.0% 3.0GB/s 10.3GB/s +239.0% jpg (not compressible)
pdf 94330 17.8% 16.0% 2.0GB/s 3.4GB/s +71.5% pdf
html4 409600 76.4% 76.4% 1.2GB/s 1.1GB/s -8.4% html4
cp 24603 51.8% 51.8% 785.2MB/s 905.6MB/s +15.3% cp
c 11150 57.4% 57.5% 778.9MB/s 889.7MB/s +14.2% c
lsp 3721 51.1% 51.2% 739.0MB/s 905.5MB/s +22.5% lsp
xls 1029744 58.6% 58.6% 730.3MB/s 718.8MB/s -1.6% xls
txt1 152089 40.2% 40.2% 582.4MB/s 559.0MB/s -4.0% txt1
txt2 125179 35.9% 35.9% 540.7MB/s 526.4MB/s -2.6% txt2
txt3 426754 42.9% 42.9% 620.5MB/s 583.9MB/s -5.9% txt3
txt4 481861 31.6% 31.6% 519.4MB/s 487.0MB/s -6.2% txt4
bin 513216 81.8% 81.8% 1.2GB/s 1.1GB/s -11.6% bin
sum 38240 48.1% 48.1% 693.4MB/s 742.4MB/s +7.1% sum
man 4227 40.2% 40.3% 637.3MB/s 784.3MB/s +23.1% man
pb 118588 76.8% 76.8% 1.4GB/s 1.4GB/s +0.4% pb
gaviota 184320 61.7% 61.7% 688.5MB/s 668.2MB/s -3.0% gaviota
</code></pre>


### Stream RoundTrip (no checksums)
<pre><code>
JNI Java JNI Java
Input Size Compress Compress Throughput Throughput Change
---------------------------------------------------------------------
html 102400 76.4% 76.4% 223.8MB/s 272.5MB/s +21.8% html
urls 702087 49.1% 49.1% 142.8MB/s 174.1MB/s +22.0% urls
jpg 126958 0.1% -0.0% 1.1GB/s 1.6GB/s +52.1% jpg (not compressible)
pdf 94330 17.8% 16.0% 421.9MB/s 610.1MB/s +44.6% pdf
html4 409600 76.4% 76.4% 226.2MB/s 275.5MB/s +21.8% html4
cp 24603 51.8% 51.8% 125.3MB/s 160.3MB/s +27.9% cp
c 11150 57.4% 57.5% 125.1MB/s 183.2MB/s +46.5% c
lsp 3721 51.1% 51.2% 130.6MB/s 149.5MB/s +14.5% lsp
xls 1029744 58.6% 58.6% 188.2MB/s 206.1MB/s +9.5% xls
txt1 152089 40.2% 40.2% 95.3MB/s 123.3MB/s +29.4% txt1
txt2 125179 35.9% 35.9% 91.4MB/s 116.8MB/s +27.9% txt2
txt3 426754 42.9% 42.9% 101.3MB/s 130.3MB/s +28.6% txt3
txt4 481861 31.6% 31.6% 87.9MB/s 111.1MB/s +26.3% txt4
bin 513216 81.8% 81.8% 294.7MB/s 337.9MB/s +14.7% bin
sum 38240 48.1% 48.1% 122.9MB/s 152.9MB/s +24.3% sum
man 4227 40.2% 40.3% 113.0MB/s 139.1MB/s +23.1% man
pb 118588 76.8% 76.8% 269.5MB/s 313.8MB/s +16.4% pb
gaviota 184320 61.7% 61.7% 131.1MB/s 180.3MB/s +37.6% gaviota
</code></pre>
72 changes: 21 additions & 51 deletions pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,11 @@
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>maven_central</id>
<name>Maven Central</name>
<url>https://repo.maven.apache.org/maven2/</url>
</repository>
</repositories>

<distributionManagement>
Expand All @@ -78,29 +83,35 @@
</distributionManagement>

<dependencies>
<!--
Hadoop is optional for the CompressionCodec. Only constants and
interfaces are used from the Hadoop jar, so there this code
does not have vulnerabilities from Hadoop.
This specific version was chosen because, it has the least
number of known vulnerabilities at this time.
-->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>0.20.2</version>
<artifactId>hadoop-common</artifactId>
<version>3.4.0</version>
<optional>true</optional>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>13.0.1</version>
<version>33.2.0-jre</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.xerial.snappy</groupId>
<artifactId>snappy-java</artifactId>
<version>1.0.4.1</version>
<scope>test</scope>
<version>1.1.8.4</version>
</dependency>
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>6.0.1</version>
<version>7.5.1</version>
<scope>test</scope>
</dependency>
</dependencies>
Expand All @@ -110,7 +121,7 @@
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.0</version>
<version>3.4.1</version>
<executions>
<execution>
<id>enforce-versions</id>
Expand All @@ -123,7 +134,7 @@
<version>3.0.0</version>
</requireMavenVersion>
<requireJavaVersion>
<version>1.6</version>
<version>1.8</version>
</requireJavaVersion>
</rules>
</configuration>
Expand All @@ -134,47 +145,6 @@
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.3.2</version>
<executions>
<execution>
<id>binary</id>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>bin</classifier>
<archive>
<manifest>
<mainClass>org.iq80.snappy.Main</mainClass>
</manifest>
</archive>
</configuration>
</execution>
</executions>
</plugin>

<plugin>
<groupId>org.skife.maven</groupId>
<artifactId>really-executable-jar-maven-plugin</artifactId>
<version>1.0.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>really-executable-jar</goal>
</goals>
<configuration>
<classifier>bin</classifier>
</configuration>
</execution>
</executions>
</plugin>

</plugins>

<pluginManagement>
Expand Down Expand Up @@ -212,8 +182,8 @@
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>

Expand Down
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