James Clampffer resolved HDFS-9453.
    Resolution: Duplicate
      Assignee:     (was: James Clampffer)

Dupe of HDFS-10595

> Fix protobuf runtime warnings
> -----------------------------
>                 Key: HDFS-9453
>                 URL: https://issues.apache.org/jira/browse/HDFS-9453
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
> When performing reads sometimes this warning shows up on stdout or stderr:
> "Encountered string containing invalid UTF-8 data while serializing protocol 
> buffer. Strings must contain only UTF-8; use the 'bytes' type for raw bytes"
> Apparently this is most likely due to nulls embedded in a string field.
> Running in gdb and breaking on wire_format.cc line 1053 gets a useful stack.  
> It looks like RemoteBlockReader::async_connect eventually makes a 
> hadoop::hdfs::ClientOperationHeaderProto and VerifyUTF8String errors out.

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