viirya commented on a change in pull request #2201:
URL: https://github.com/apache/hadoop/pull/2201#discussion_r485253169
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/snappy/SnappyDecompressor.java
##########
@@ -276,13 +258,27 @@ public void end() {
// do nothing
}
- private native static void initIDs();
+ private int decompressBytesDirect() throws IOException {
+ if (compressedDirectBufLen == 0) {
+ return 0;
+ } else {
+ // Set the position and limit of `compressedDirectBuf` for reading
+ compressedDirectBuf.position(0).limit(compressedDirectBufLen);
+ // There is compressed input, decompress it now.
+ int size = Snappy.uncompressedLength((ByteBuffer) compressedDirectBuf);
+ if (size > uncompressedDirectBuf.capacity()) {
Review comment:
Should we check with `uncompressedDirectBuf.remaining` instead of
`capacity`?
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/snappy/SnappyDecompressor.java
##########
@@ -276,13 +258,27 @@ public void end() {
// do nothing
}
- private native static void initIDs();
+ private int decompressBytesDirect() throws IOException {
+ if (compressedDirectBufLen == 0) {
+ return 0;
+ } else {
+ // Set the position and limit of `compressedDirectBuf` for reading
+ compressedDirectBuf.position(0).limit(compressedDirectBufLen);
Review comment:
I'm not sure we need to set position and limit here? If
`compressedDirectBuf` already has been set with position and limit before
calling `decompressBytesDirect`? Won't we read wrong data from this buffer?
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