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https://issues.apache.org/jira/browse/HADOOP-17125?focusedWorklogId=491359&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-491359
]
ASF GitHub Bot logged work on HADOOP-17125:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 25/Sep/20 18:51
Start Date: 25/Sep/20 18:51
Worklog Time Spent: 10m
Work Description: sunchao commented on a change in pull request #2297:
URL: https://github.com/apache/hadoop/pull/2297#discussion_r495158362
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/snappy/SnappyCompressor.java
##########
@@ -291,9 +283,17 @@ public long getBytesWritten() {
public void end() {
}
- private native static void initIDs();
-
- private native int compressBytesDirect();
-
- public native static String getLibraryName();
+ private int compressDirectBuf() throws IOException {
+ if (uncompressedDirectBufLen == 0) {
+ return 0;
+ } else {
+ // Set the position and limit of `uncompressedDirectBuf` for reading
+ uncompressedDirectBuf.limit(uncompressedDirectBufLen).position(0);
+ int size = Snappy.compress((ByteBuffer) uncompressedDirectBuf,
+ (ByteBuffer) compressedDirectBuf);
+ uncompressedDirectBufLen = 0;
+
uncompressedDirectBuf.limit(uncompressedDirectBuf.capacity()).position(0);
Review comment:
nit: this seems unnecessary as `clear` is called shortly after at the
call site?
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/snappy/SnappyDecompressor.java
##########
@@ -276,10 +268,20 @@ public void end() {
// do nothing
}
- private native static void initIDs();
+ private int decompressDirectBuf() throws IOException {
+ if (compressedDirectBufLen == 0) {
+ return 0;
+ } else {
+ // Set the position and limit of `compressedDirectBuf` for reading
+ compressedDirectBuf.limit(compressedDirectBufLen).position(0);
+ int size = Snappy.uncompress((ByteBuffer) compressedDirectBuf,
+ (ByteBuffer) uncompressedDirectBuf);
+ compressedDirectBufLen = 0;
+ compressedDirectBuf.limit(compressedDirectBuf.capacity()).position(0);
Review comment:
nit: can we just call `compressedDirectBuf.clear()`?
##########
File path:
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/snappy/TestSnappyCompressorDecompressor.java
##########
@@ -446,4 +442,49 @@ public void doWork() throws Exception {
ctx.waitFor(60000);
}
+
+ @Test
+ public void testSnappyCompatibility() throws Exception {
+ // HADOOP-17125. Using snappy-java in SnappyCodec. These strings are raw
data and compressed data
+ // using previous native Snappy codec. We use updated Snappy codec to
decode it and check if it
+ // matches.
+ String rawData =
"010a06030a040a0c0109020c0a010204020d02000b010701080605080b090902060a08050206" +
+
"0a0d06070908080a0c0105030904090d05090800040c090c0d0d0804000d00040b0b0d010d060907020a0"
+
+
"30a0c0900040905080107040d0c01060a0b09070a04000b01040b09000e0e00020b06050b060e030e0a07"
+
+ "050d06050d";
+ String compressed =
"8001f07f010a06030a040a0c0109020c0a010204020d02000b010701080605080b0909020" +
+
"60a080502060a0d06070908080a0c0105030904090d05090800040c090c0d0d0804000d00040b0b0d010d"
+
+
"060907020a030a0c0900040905080107040d0c01060a0b09070a04000b01040b09000e0e00020b06050b0"
+
+ "60e030e0a07050d06050d";
+
+ byte[] rawDataBytes = Hex.decodeHex(rawData);
+ byte[] compressedBytes = Hex.decodeHex(compressed);
+
+ ByteBuffer inBuf = ByteBuffer.allocateDirect(compressedBytes.length);
+ inBuf.put(compressedBytes, 0, compressedBytes.length);
+ inBuf.flip();
+
+ ByteBuffer outBuf = ByteBuffer.allocateDirect(rawDataBytes.length);
+ ByteBuffer expected = ByteBuffer.wrap(rawDataBytes);
+
+ SnappyDecompressor.SnappyDirectDecompressor decompressor = new
SnappyDecompressor.SnappyDirectDecompressor();
Review comment:
nit: long lines (80 chars).
##########
File path:
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/compress/CompressDecompressTester.java
##########
@@ -495,19 +479,16 @@ public String getName() {
Compressor compressor = pair.compressor;
if (compressor.getClass().isAssignableFrom(Lz4Compressor.class)
- && (NativeCodeLoader.isNativeCodeLoaded()))
Review comment:
nit: unrelated changes :)
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/snappy/SnappyDecompressor.java
##########
@@ -45,30 +46,21 @@
private int userBufOff = 0, userBufLen = 0;
private boolean finished;
- private static boolean nativeSnappyLoaded = false;
-
- static {
- if (NativeCodeLoader.isNativeCodeLoaded() &&
- NativeCodeLoader.buildSupportsSnappy()) {
- try {
- initIDs();
- nativeSnappyLoaded = true;
- } catch (Throwable t) {
- LOG.error("failed to load SnappyDecompressor", t);
- }
- }
- }
-
- public static boolean isNativeCodeLoaded() {
- return nativeSnappyLoaded;
- }
-
/**
* Creates a new compressor.
*
* @param directBufferSize size of the direct buffer to be used.
*/
public SnappyDecompressor(int directBufferSize) {
+ // `snappy-java` is provided scope. We need to check if it is available.
+ try {
+ SnappyLoader.getVersion();
Review comment:
nit: `SnappyLoader` is marked as "internal use-only" though so not sure
if there is better alternative here.
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Issue Time Tracking
-------------------
Worklog Id: (was: 491359)
Time Spent: 18h 10m (was: 18h)
> Using snappy-java in SnappyCodec
> --------------------------------
>
> Key: HADOOP-17125
> URL: https://issues.apache.org/jira/browse/HADOOP-17125
> Project: Hadoop Common
> Issue Type: New Feature
> Components: common
> Affects Versions: 3.3.0
> Reporter: DB Tsai
> Priority: Major
> Labels: pull-request-available
> Time Spent: 18h 10m
> Remaining Estimate: 0h
>
> In Hadoop, we use native libs for snappy codec which has several
> disadvantages:
> * It requires native *libhadoop* and *libsnappy* to be installed in system
> *LD_LIBRARY_PATH*, and they have to be installed separately on each node of
> the clusters, container images, or local test environments which adds huge
> complexities from deployment point of view. In some environments, it requires
> compiling the natives from sources which is non-trivial. Also, this approach
> is platform dependent; the binary may not work in different platform, so it
> requires recompilation.
> * It requires extra configuration of *java.library.path* to load the
> natives, and it results higher application deployment and maintenance cost
> for users.
> Projects such as *Spark* and *Parquet* use
> [snappy-java|[https://github.com/xerial/snappy-java]] which is JNI-based
> implementation. It contains native binaries for Linux, Mac, and IBM in jar
> file, and it can automatically load the native binaries into JVM from jar
> without any setup. If a native implementation can not be found for a
> platform, it can fallback to pure-java implementation of snappy based on
> [aircompressor|[https://github.com/airlift/aircompressor/tree/master/src/main/java/io/airlift/compress/snappy]].
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