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https://issues.apache.org/jira/browse/HADOOP-10533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13977986#comment-13977986
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Steve Loughran commented on HADOOP-10533:
-----------------------------------------
looking at this code, the only way the inner {{in}} stream can be null is if
the {{store.retrieve(key)}} operation returned null. It does this if any
exception is raised when trying to retrieve the data *that is not an instance
of or subclass of IOException*, or the http response returned null
Either
# Something is going wrong with the GET, and that exception is being logged at
debug, then discarded.
# the HTTP request is returning a null response and this is not being picked up.
having the constructor and seek() operations check for null values and raise an
IOE is the solution here; making close more robust wise, but does not address
the real problem
> S3 input stream NPEs in MapReduce jon
> -------------------------------------
>
> Key: HADOOP-10533
> URL: https://issues.apache.org/jira/browse/HADOOP-10533
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 1.0.0, 1.0.3
> Environment: Hadoop with default configurations
> Reporter: Benjamin Kim
> Priority: Minor
>
> 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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