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https://issues.apache.org/jira/browse/MAPREDUCE-6635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Junping Du updated MAPREDUCE-6635:
----------------------------------
Status: Patch Available (was: Open)
> Unsafe long to int conversion in UncompressedSplitLineReader and
> IndexOutOfBoundsException
> ------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6635
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6635
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Junping Du
> Attachments: MAPREDUCE-6635.patch
>
>
> LineRecordReader creates the unsplittable reader like so:
> {noformat}
> in = new UncompressedSplitLineReader(
> fileIn, job, recordDelimiter, split.getLength());
> {noformat}
> Split length goes to
> {noformat}
> private long splitLength;
> {noformat}
> At some point when reading the first line, fillBuffer does this:
> {noformat}
> @Override
> protected int fillBuffer(InputStream in, byte[] buffer, boolean inDelimiter)
> throws IOException {
> int maxBytesToRead = buffer.length;
> if (totalBytesRead < splitLength) {
> maxBytesToRead = Math.min(maxBytesToRead,
> (int)(splitLength - totalBytesRead));
> {noformat}
> which will be a negative number for large splits, and the subsequent dfs read
> will fail with a boundary check.
> {noformat}
> java.lang.IndexOutOfBoundsException
> at java.nio.Buffer.checkBounds(Buffer.java:559)
> at java.nio.ByteBuffer.get(ByteBuffer.java:668)
> at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:279)
> at
> org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:172)
> at
> org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:744)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:800)
> at
> org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:860)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:903)
> at java.io.DataInputStream.read(DataInputStream.java:149)
> at
> org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.fillBuffer(UncompressedSplitLineReader.java:59)
> at
> org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:216)
> at org.apache.hadoop.util.LineReader.readLine(LineReader.java:174)
> at
> org.apache.hadoop.mapreduce.lib.input.UncompressedSplitLineReader.readLine(UncompressedSplitLineReader.java:91)
> at
> org.apache.hadoop.mapreduce.lib.input.LineRecordReader.skipUtfByteOrderMark(LineRecordReader.java:144)
> at
> org.apache.hadoop.mapreduce.lib.input.LineRecordReader.nextKeyValue(LineRecordReader.java:184)
> {noformat}
> This has been reported here: https://issues.streamsets.com/browse/SDC-2229,
> also happens in Hive if very large text files are forced to be read in a
> single split (e.g. via header-skipping feature, or via set
> mapred.min.split.size=9999999999999999)
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