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

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This commit is contained in:
Akira Ajisaka 2016-06-14 10:18:17 +09:00
parent 709a814fe0
commit e3ba9ad3f1
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 SplitCompressionInputStream createInputStream(InputStream seekableIn,
// 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
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@ -175,69 +175,75 @@ public void testSplitableCodecs() throws IOException {
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 {