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HADOOP-13270. BZip2CompressionInputStream finds the same compression marker twice in corner case, causing duplicate data blocks. Contributed by Kai Sasaki. 

(cherry picked from commit e3ba9ad3f1)
(cherry picked from commit d219550e8b)
This commit is contained in:
Akira Ajisaka 2016-06-14 10:18:17 +09:00
parent 56e29d2711
commit 8295351e54
2 changed files with 71 additions and 60 deletions
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7
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/compress/BZip2Codec.java
View File

@ -207,7 +207,12 @@ public class BZip2Codec implements Configurable, SplittableCompressionCodec {
// time stream might start without a leading BZ.
final long FIRST_BZIP2_BLOCK_MARKER_POSITION =
CBZip2InputStream.numberOfBytesTillNextMarker(seekableIn);
long adjStart = Math.max(0L, start - FIRST_BZIP2_BLOCK_MARKER_POSITION);
long adjStart = 0L;
if (start != 0) {
// Other than the first of file, the marker size is 6 bytes.
adjStart = Math.max(0L, start - (FIRST_BZIP2_BLOCK_MARKER_POSITION
- (HEADER_LEN + SUB_HEADER_LEN)));
}
((Seekable)seekableIn).seek(adjStart);
SplitCompressionInputStream in =

124
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-jobclient/src/test/java/org/apache/hadoop/mapred/TestTextInputFormat.java
View File

@ -175,69 +175,75 @@ public class TestTextInputFormat {
for (int length = MAX_LENGTH / 2; length < MAX_LENGTH;
length += random.nextInt(MAX_LENGTH / 4)+1) {
LOG.info("creating; entries = " + length);
// create a file with length entries
Writer writer =
new OutputStreamWriter(codec.createOutputStream(localFs.create(file)));
try {
for (int i = 0; i < length; i++) {
writer.write(Integer.toString(i));
writer.write("\n");
}
} finally {
writer.close();
}
// try splitting the file in a variety of sizes
TextInputFormat format = new TextInputFormat();
format.configure(conf);
LongWritable key = new LongWritable();
Text value = new Text();
for (int i = 0; i < 3; i++) {
int numSplits = random.nextInt(MAX_LENGTH/2000)+1;
LOG.info("splitting: requesting = " + numSplits);
InputSplit[] splits = format.getSplits(conf, numSplits);
LOG.info("splitting: got = " + splits.length);
// check each split
BitSet bits = new BitSet(length);
for (int j = 0; j < splits.length; j++) {
LOG.debug("split["+j+"]= " + splits[j]);
RecordReader<LongWritable, Text> reader =
format.getRecordReader(splits[j], conf, reporter);
try {
int counter = 0;
while (reader.next(key, value)) {
int v = Integer.parseInt(value.toString());
LOG.debug("read " + v);
if (bits.get(v)) {
LOG.warn("conflict with " + v +
" in split " + j +
" at position "+reader.getPos());
}
assertFalse("Key in multiple partitions.", bits.get(v));
bits.set(v);
counter++;
}
if (counter > 0) {
LOG.info("splits["+j+"]="+splits[j]+" count=" + counter);
} else {
LOG.debug("splits["+j+"]="+splits[j]+" count=" + counter);
}
} finally {
reader.close();
}
}
assertEquals("Some keys in no partition.", length, bits.cardinality());
int numSplits = random.nextInt(MAX_LENGTH / 2000) + 1;
verifyPartitions(length, numSplits, file, codec, conf);
}
}
// corner case when we have byte alignment and position of stream are same
verifyPartitions(471507, 218, file, codec, conf);
verifyPartitions(473608, 110, file, codec, conf);
}
private void verifyPartitions(int length, int numSplits, Path file,
CompressionCodec codec, JobConf conf) throws IOException {
LOG.info("creating; entries = " + length);
// create a file with length entries
Writer writer =
new OutputStreamWriter(codec.createOutputStream(localFs.create(file)));
try {
for (int i = 0; i < length; i++) {
writer.write(Integer.toString(i));
writer.write("\n");
}
} finally {
writer.close();
}
// try splitting the file in a variety of sizes
TextInputFormat format = new TextInputFormat();
format.configure(conf);
LongWritable key = new LongWritable();
Text value = new Text();
LOG.info("splitting: requesting = " + numSplits);
InputSplit[] splits = format.getSplits(conf, numSplits);
LOG.info("splitting: got = " + splits.length);
// check each split
BitSet bits = new BitSet(length);
for (int j = 0; j < splits.length; j++) {
LOG.debug("split["+j+"]= " + splits[j]);
RecordReader<LongWritable, Text> reader =
format.getRecordReader(splits[j], conf, Reporter.NULL);
try {
int counter = 0;
while (reader.next(key, value)) {
int v = Integer.parseInt(value.toString());
LOG.debug("read " + v);
if (bits.get(v)) {
LOG.warn("conflict with " + v +
" in split " + j +
" at position "+reader.getPos());
}
assertFalse("Key in multiple partitions.", bits.get(v));
bits.set(v);
counter++;
}
if (counter > 0) {
LOG.info("splits["+j+"]="+splits[j]+" count=" + counter);
} else {
LOG.debug("splits["+j+"]="+splits[j]+" count=" + counter);
}
} finally {
reader.close();
}
}
assertEquals("Some keys in no partition.", length, bits.cardinality());
}
private static LineReader makeStream(String str) throws IOException {