fail to use Hadoop DistCp

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黃子恩

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Nov 2, 2015, 3:41:18 AM11/2/15
to Tachyon Users
I am trying to transfer data from Tachyon (0.9.0) to a remote HDFS (2.4.1) cluster; however I get an error message

bin/hadoop distcp -libjars tachyon-client-0.9.0-SNAPSHOT-jar-with-dependencies.jar tachyon://c02:19998/in hdfs://c03:39100/user/trey/out

Error: java.io.IOException: File copy failed: tachyon://c02:19998/in --> hdfs://c03:39100/user/trey/out
        at org.apache.hadoop.tools.mapred.CopyMapper.copyFileWithRetry(CopyMapper.java:262)
        at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:229)
        at org.apache.hadoop.tools.mapred.CopyMapper.map(CopyMapper.java:45)
        at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:167)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1556)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
Caused by: java.io.IOException: Couldn't run retriable-command: Copyingtachyon://c02:19998/in to hdfs://c03:39100/user/trey/out
        at org.apache.hadoop.tools.util.RetriableCommand.execute(RetriableCommand.java:101)
        at org.apache.hadoop.tools.mapred.CopyMapper.copyFileWithRetry(CopyMapper.java:259)
        ... 10 more
Caused by: org.apache.hadoop.tools.mapred.RetriableFileCopyCommand$CopyReadException: java.io.IOException: Not supported
        at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.readBytes(RetriableFileCopyCommand.java:263)
        at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.copyBytes(RetriableFileCopyCommand.java:228)
        at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.copyToTmpFile(RetriableFileCopyCommand.java:164)
        at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doCopy(RetriableFileCopyCommand.java:118)
        at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.doExecute(RetriableFileCopyCommand.java:95)
        at org.apache.hadoop.tools.util.RetriableCommand.execute(RetriableCommand.java:87)
        ... 11 more
Caused by: java.io.IOException: Not supported
        at tachyon.hadoop.HdfsFileInputStream.available(HdfsFileInputStream.java:107)
        at java.io.FilterInputStream.available(FilterInputStream.java:168)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:353)
        at java.io.FilterInputStream.read(FilterInputStream.java:107)
        at org.apache.hadoop.tools.util.ThrottledInputStream.read(ThrottledInputStream.java:75)
        at org.apache.hadoop.tools.mapred.RetriableFileCopyCommand.readBytes(RetriableFileCopyCommand.java:260)
        ... 16 more

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Is there anyway to solve it?

Gene Pang

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Nov 3, 2015, 1:58:41 PM11/3/15
to Tachyon Users
It looks like it is running into this intentional exception:


I am not entirely sure why it is not supported, but maybe you could create a JIRA ticket for this and maybe even provide a fix for it.

Thanks,
Gene
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