Benjamin Kim created MAPREDUCE-4718:
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Summary: MapReduce fails If I pass a parameter as a S3 folder
Key: MAPREDUCE-4718
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4718
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: job submission
Affects Versions: 1.0.3, 1.0.0
Environment: Hadoop with default configurations
Reporter: Benjamin Kim
I'm running a wordcount MR as follows
hadoop jar WordCount.jar wordcount.WordCountDriver s3n://bucket/wordcount/input
s3n://bucket/wordcount/output
s3n://bucket/wordcount/input is a s3 object that contains other input files.
However I get following NPE error
12/10/02 18:56:23 INFO mapred.JobClient: map 0% reduce 0%
12/10/02 18:56:54 INFO mapred.JobClient: map 50% reduce 0%
12/10/02 18:56:56 INFO mapred.JobClient: Task Id :
attempt_201210021853_0001_m_000001_0, Status : FAILED
java.lang.NullPointerException
at
org.apache.hadoop.fs.s3native.NativeS3FileSystem$NativeS3FsInputStream.close(NativeS3FileSystem.java:106)
at java.io.BufferedInputStream.close(BufferedInputStream.java:451)
at java.io.FilterInputStream.close(FilterInputStream.java:155)
at org.apache.hadoop.util.LineReader.close(LineReader.java:83)
at
org.apache.hadoop.mapreduce.lib.input.LineRecordReader.close(LineRecordReader.java:144)
at
org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.close(MapTask.java:497)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:765)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
MR runs fine if i specify more specific input path such as
s3n://bucket/wordcount/input/file.txt
MR fails if I pass s3 folder as a parameter
In summary,
This works
hadoop jar ./hadoop-examples-1.0.3.jar wordcount /user/hadoop/wordcount/input/
s3n://bucket/wordcount/output/
This doesn't work
hadoop jar ./hadoop-examples-1.0.3.jar wordcount s3n://bucket/wordcount/input/
s3n://bucket/wordcount/output/
(both input path are directories)
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