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Pig >> mail # user >> JsonStorage() fails to write .pig_schema to S3 after correctly writing alias to json files.


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Alan Crosswell 2013-06-08, 19:26
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Russell Jurney 2013-06-08, 23:41
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Re: JsonStorage() fails to write .pig_schema to S3 after correctly writing alias to json files.
I don't have a solution but just wondering what lib are you using for
JsonStorage? I hope it doesn't have any issues in it.

Regards,
Shahab
On Sat, Jun 8, 2013 at 3:26 PM, Alan Crosswell <[EMAIL PROTECTED]> wrote:

> Hello,
>
> I've been having trouble with JsonStorage(). First, since my Python UDF had
> an outputSchema that returned floats, I was getting an error in JsonStorage
> trying to cast Double to Float. I resolved this by changing my UDF to
> return doubles.
>
> Pig-0.11.1, hadoop-1.0.3.
>
> Next, I am able to successfully write json files out to s3 (I was watching
> as my Pig job was running and grabbed a sample) but then at what appears to
> be the final step of writing .pig_schema, this error is thrown:
>
> grunt> *STORE firsts INTO 's3n://n2ygk/firsthops.json' using
> JsonStorage();*
> *
> *
> *... *chugs along for a while successfully writing
> s3://n2ygk/firsthops.json/part-r-* into the bucket.... and then:
>
> *java.lang.IllegalArgumentException: This file system object (hdfs://
> 10.253.44.244:9000) does not support access to the request path
> 's3n://n2ygk/firsthops.json/.pig_schema' You possibly called
> FileSystem.get(conf) when you should have called FileSystem.get(uri, conf)
> to obtain a file system supporting your path.*
>                                     at
> org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:384)
>                                     at
>
> org.apache.hadoop.hdfs.DistributedFileSystem.getPathName(DistributedFileSystem.java:129)
>                                     at
>
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:513)
>                                     at
> org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:770)
>                                     at
>
> org.apache.pig.backend.hadoop.datastorage.HDataStorage.isContainer(HDataStorage.java:200)
>                                     at
>
> org.apache.pig.backend.hadoop.datastorage.HDataStorage.asElement(HDataStorage.java:128)
>                                     at
>
> org.apache.pig.backend.hadoop.datastorage.HDataStorage.asElement(HDataStorage.java:144)
>                                     at
> org.apache.pig.builtin.JsonMetadata.storeSchema(JsonMetadata.java:294)
>                                     at
> org.apache.pig.builtin.JsonStorage.storeSchema(JsonStorage.java:274)
>                                     at
>
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputCommitter.storeCleanup(PigOutputCommitter.java:141)
>                                     at
>
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigOutputCommitter.commitJob(PigOutputCommitter.java:204)
>                                     at
> org.apache.hadoop.mapred.Task.runJobCleanupTask(Task.java:1060)
>                                     at
> org.apache.hadoop.mapred.MapTask.run(MapTask.java:362)
>                                     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:1132)
>                                     at
> org.apache.hadoop.mapred.Child.main(Child.java:249)
>
> Any ideas?
>
> Thanks.
> /a
>
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Alan Crosswell 2013-06-09, 00:46