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  1. Hive
  2. HIVE-17181

HCatOutputFormat should expose complete output-schema (including partition-keys) for dynamic-partitioning MR jobs

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 2.2.0, 3.0.0
    • Fix Version/s: 3.0.0, 2.4.0
    • Component/s: HCatalog
    • Labels:
      None

      Description

      Map/Reduce jobs that use HCatalog APIs to write to Hive tables using Dynamic partitioning are expected to call the following API methods:

      1. HCatOutputFormat.setOutput() to indicate which table/partitions to write to. This call populates the OutputJobInfo with details fetched from the Metastore.
      2. HCatOutputFormat.setSchema() to indicate the output-schema for the data being written.

      It is a common mistake to invoke HCatOUtputFormat.setSchema() as follows:

      HCatOutputFormat.setSchema(conf, HCatOutputFormat.getTableSchema(conf));
      

      Unfortunately, getTableSchema() returns only the record-schema, not the entire table's schema. We'll need a better API for use in M/R jobs to get the complete table-schema.

        Attachments

        1. HIVE-17181.1-branch-2.patch
          6 kB
          Mithun Radhakrishnan
        2. HIVE-17181.3.patch
          6 kB
          Mithun Radhakrishnan
        3. HIVE-17181.2.patch
          6 kB
          Mithun Radhakrishnan
        4. HIVE-17181.1.patch
          2 kB
          Mithun Radhakrishnan

          Activity

            People

            • Assignee:
              mithun Mithun Radhakrishnan
              Reporter:
              mithun Mithun Radhakrishnan
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              Dates

              • Created:
                Updated:
                Resolved: