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From "Bob Hansen (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-10595) libhdfs++: Client Name Protobuf Error
Date Thu, 29 Sep 2016 17:59:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bob Hansen reopened HDFS-10595:
      Assignee: Bob Hansen

On second thought, let me fix this issue here and see if the rest of the errors go away in

> libhdfs++: Client Name Protobuf Error
> -------------------------------------
>                 Key: HDFS-10595
>                 URL: https://issues.apache.org/jira/browse/HDFS-10595
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Anatoli Shein
>            Assignee: Bob Hansen
> When running a cat tool (/hadoop-hdfs-native-client/src/main/native/libhdfspp/examples/cat/c/cat.c)
I get the following error:
> [libprotobuf ERROR google/protobuf/wire_format.cc:1053] String field contains invalid
UTF-8 data when serializing a protocol buffer. Use the 'bytes' type if you intend to send
raw bytes.
> However it executes correctly. Looks like this error happens when trying to serialize
Client name in ClientOperationHeaderProto::SerializeWithCachedSizes (/hadoop-hdfs-native-client/target/main/native/libhdfspp/lib/proto/datatransfer.pb.cc)
> Possibly the problem is caused by generating client name as a UUID in GetRandomClientName
> In Java client it looks like there are two different unique client identifiers: ClientName
and ClientId:
> Client name is generated as:
> clientName = "DFSClient_" + dfsClientConf.getTaskId() + "_" + ThreadLocalRandom.current().nextInt()
 + "_" + Thread.currentThread().getId(); (/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java)
> ClientId is generated as a UUID in (/hadoop-common/src/main/java/org/apache/hadoop/ipc/ClientId.java)
> In libhdfs++ we need to possibly also have two unique client identifiers, or fix the
current client name to work without protobuf warnings/errors.

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