I want to copy just a single file to HDFS using s3distcp. I have tried using the srcPattern argument but it didn't help and it keeps on throwing java.lang.Runtime exception. It is possible that the regex I am using is the culprit, please help.
My code is as follows:
elastic-mapreduce -j $jobflow --jar s3://us-east-1.elasticmapreduce/libs/s3distcp/1.latest/s3distcp.jar --args '--src,s3://<mybucket>/<path>' --args '--dest,hdfs:///output' --arg --srcPattern --arg '(filename)'
Exception thrown:
Exception in thread "main" java.lang.RuntimeException: Error running job at com.amazon.external.elasticmapreduce.s3distcp.S3DistCp.run(S3DistCp.java:586) at com.amazon.external.elasticmapreduce.s3distcp.S3DistCp.run(S3DistCp.java:216) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65) at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79) at com.amazon.external.elasticmapreduce.s3distcp.Main.main(Main.java:12) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.RunJar.main(RunJar.java:156) Caused by: org.apache.hadoop.mapred.InvalidInputException: Input path does not exist: hdfs:/tmp/a088f00d-a67e-4239-bb0d-32b3a6ef0105/files at org.apache.hadoop.mapred.FileInputFormat.listStatus(FileInputFormat.java:197) at org.apache.hadoop.mapred.SequenceFileInputFormat.listStatus(SequenceFileInputFormat.java:40) at org.apache.hadoop.mapred.FileInputFormat.getSplits(FileInputFormat.java:208) at org.apache.hadoop.mapred.JobClient.writeOldSplits(JobClient.java:1036) at org.apache.hadoop.mapred.JobClient.writeSplits(JobClient.java:1028) at org.apache.hadoop.mapred.JobClient.access$700(JobClient.java:172) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:944) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:897) 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:1059) at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:897) at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:871) at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:1308) at com.amazon.external.elasticmapreduce.s3distcp.S3DistCp.run(S3DistCp.java:568) ... 9 more
The regex I was using was indeed the culprit.
Say the file names have dates, for example files are like abcd-2013-06-12.gz , then in order to copy ONLY this file, following emr command should do:
elastic-mapreduce -j $jobflow --jar s3://us-east-1.elasticmapreduce/libs/s3distcp/1.latest/s3distcp.jar --args '--src,s3:///' --args '--dest,hdfs:///output' --arg --srcPattern --arg '.*2013-06-12.gz'
If I remember correctly, my regex initially was *2013-06-12.gz and not .*2013-06-12.gz. So the dot at the beginning was needed.