FAQ
Can't read binary data off HDFS
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Key: HDFS-1169
URL: https://issues.apache.org/jira/browse/HDFS-1169
Project: Hadoop HDFS
Issue Type: Bug
Components: contrib/thriftfs
Affects Versions: 0.20.2
Reporter: Erik Forsberg


Trying to access binary data stored in HDFS (in my case, TypedByte files generated by Dumbo) via thrift talking to org.apache.hadoop.thriftfs.HadoopThriftServer, the data I get back is mangled. For example, when I read a file which contains the value 0xa2, it's coming back as 0xef 0xbf 0xbd, also known as the Unicode replacement character.

I think this is because the read method in HadoopThriftServer.java is trying to convert the data read from HDFS into UTF-8 via the String() constructor.

This essentially makes the HDFS thrift API useless for me :-(.

Not being an expert on Thrift, but would it be possible to modify the API so that it uses the binary type listed on http://wiki.apache.org/thrift/ThriftTypes?

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postedMay 21, '10 at 9:45a
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