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HADOOP-11445. Bzip2Codec: Data block is skipped when position of newly created stream is equal to start of split. Contributed by Ankit Kamboj 

(cherry picked from commit d02fb53750)
This commit is contained in:
Jason Lowe 2015-01-06 21:19:10 +00:00
parent 53ecb63587
commit 2b408d8dc7
3 changed files with 25 additions and 1 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -322,6 +322,9 @@ Release 2.7.0 - UNRELEASED
HADOOP-11459. Fix recent findbugs in ActiveStandbyElector, NetUtils
and ShellBasedIdMapping (vinayakumarb)
HADOOP-11445. Bzip2Codec: Data block is skipped when position of newly
created stream is equal to start of split (Ankit Kamboj via jlowe)
Release 2.6.0 - 2014-11-18
INCOMPATIBLE CHANGES

2
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/BZip2Codec.java
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@ -225,7 +225,7 @@ public class BZip2Codec implements Configurable, SplittableCompressionCodec {
// ........................................^^[We align at wrong position!]
// ...........................................................^^[While this pos is correct]
if (in.getPos() <= start) {
if (in.getPos() < start) {
((Seekable)seekableIn).seek(start);
in = new BZip2CompressionInputStream(seekableIn, start, end, readMode);
}

21
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestLineRecordReader.java
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@ -106,6 +106,27 @@ public class TestLineRecordReader {
testSplitRecords("blockEndingInCRThenLF.txt.bz2", 136498);
}
//This test ensures record reader doesn't lose records when it starts
//exactly at the starting byte of a bz2 compressed block
@Test
public void testBzip2SplitStartAtBlockMarker() throws IOException {
//136504 in blockEndingInCR.txt.bz2 is the byte at which the bz2 block ends
//In the following test cases record readers should iterate over all the records
//and should not miss any record.
//Start next split at just the start of the block.
testSplitRecords("blockEndingInCR.txt.bz2", 136504);
//Start next split a byte forward in next block.
testSplitRecords("blockEndingInCR.txt.bz2", 136505);
//Start next split 3 bytes forward in next block.
testSplitRecords("blockEndingInCR.txt.bz2", 136508);
//Start next split 10 bytes from behind the end marker.
testSplitRecords("blockEndingInCR.txt.bz2", 136494);
}
// Use the LineRecordReader to read records from the file
public ArrayList<String> readRecords(URL testFileUrl, int splitSize)
throws IOException {