ConfX created HADOOP-19339:
------------------------------
Summary: OutofBounds Exception due to assumption about buffer size
in BlockCompressorStream
Key: HADOOP-19339
URL: https://issues.apache.org/jira/browse/HADOOP-19339
Project: Hadoop Common
Issue Type: Bug
Components: common
Affects Versions: 3.4.1
Reporter: ConfX
Assignee: ConfX
h3. What Happened:
Got an OutofBounds exception when io.compression.codec.snappy.buffersize is set
to 7. BlockCompressorStream assumes that the buffer size will always be greater
than the compression overhead, and consequently MAX_INPUT_SIZE will always be
greater than or equal to 0.
h3. Buggy Code:
When io.compression.codec.snappy.buffersize is set to 7, compressionOverhead is
33 and MAX_INPUT_SIZE is -26.
{code:java}
public BlockCompressorStream(OutputStream out, Compressor compressor,
int bufferSize, int compressionOverhead) {
super(out, compressor, bufferSize);
MAX_INPUT_SIZE = bufferSize - compressionOverhead; // -> Assumes bufferSize
is always greater than compressionOverhead and MAX_INPUT_SIZE is non-negative.
} {code}
h3. Stack Trace:
{code:java}
java.lang.ArrayIndexOutOfBoundsException
at
org.apache.hadoop.io.compress.snappy.SnappyCompressor.setInput(SnappyCompressor.java:86)
at
org.apache.hadoop.io.compress.BlockCompressorStream.write(BlockCompressorStream.java:112)
{code}
h3. How to Reproduce:
(1) Set io.compression.codec.snappy.buffersize to 7
(2) Run test: org.apache.hadoop.io.compress.TestCodec#testSnappyMapFile
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