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Andrew Ash commented on HADOOP-10614: ------------------------------------- Thanks Sandy and Xiangrui for fixing this issue! > CBZip2InputStream is not threadsafe > ----------------------------------- > > Key: HADOOP-10614 > URL: https://issues.apache.org/jira/browse/HADOOP-10614 > Project: Hadoop Common > Issue Type: Improvement > Affects Versions: 1.2.1, 2.2.0 > Reporter: Xiangrui Meng > Assignee: Xiangrui Meng > Fix For: 1.3.0, 2.5.0 > > Attachments: bzip2-2.diff, bzip2.diff > > > Hadoop uses CBZip2InputStream to decode bzip2 files. However, the > implementation is not threadsafe. This is not a really problem for Hadoop > MapReduce because Hadoop runs each task in a separate JVM. But for other > libraries that utilize multithreading and use Hadoop's InputFormat, e.g., > Spark, it will cause exceptions like the following: > {code} > java.lang.ArrayIndexOutOfBoundsException: 6 > org.apache.hadoop.io.compress.bzip2.CBZip2InputStream.recvDecodingTables(CBZip2InputStream.java:729) > > org.apache.hadoop.io.compress.bzip2.CBZip2InputStream.getAndMoveToFrontDecode(CBZip2InputStream.java:795) > > org.apache.hadoop.io.compress.bzip2.CBZip2InputStream.initBlock(CBZip2InputStream.java:499) > > org.apache.hadoop.io.compress.bzip2.CBZip2InputStream.changeStateToProcessABlock(CBZip2InputStream.java:330) > > org.apache.hadoop.io.compress.bzip2.CBZip2InputStream.read(CBZip2InputStream.java:394) > > org.apache.hadoop.io.compress.BZip2Codec$BZip2CompressionInputStream.read(BZip2Codec.java:428) > java.io.InputStream.read(InputStream.java:101) > org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:205) > org.apache.hadoop.util.LineReader.readLine(LineReader.java:169) > org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:176) > org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:43) > org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:198) > org.apache.spark.rdd.HadoopRDD$$anon$1.getNext(HadoopRDD.scala:181) > org.apache.spark.util.NextIterator.hasNext(NextIterator.scala:71) > org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:35) > scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:327) > org.apache.spark.util.Utils$.getIteratorSize(Utils.scala:1000) > org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:847) > org.apache.spark.rdd.RDD$$anonfun$count$1.apply(RDD.scala:847) > org.apache.spark.SparkContext$$anonfun$runJob$4.apply(SparkContext.scala:1077) > > org.apache.spark.SparkContext$$anonfun$runJob$4.apply(SparkContext.scala:1077) > org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:111) > org.apache.spark.scheduler.Task.run(Task.scala:51) > org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:187) > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > java.lang.Thread.run(Thread.java:724) > {code} -- This message was sent by Atlassian JIRA (v6.2#6252)