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Posted to issues@spark.apache.org by "Yang Wang (JIRA)" <ji...@apache.org> on 2016/09/14 15:06:20 UTC

[jira] [Created] (SPARK-17537) Improve performance for reading parquet schema

Yang Wang created SPARK-17537:
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             Summary: Improve performance for reading parquet schema
                 Key: SPARK-17537
                 URL: https://issues.apache.org/jira/browse/SPARK-17537
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.0.0, 1.6.2
            Reporter: Yang Wang
            Priority: Minor


spark.read.parquet would issue a spark jobs to read parquet schema. When spark.sql.parquet.mergeSchema are set to false (the default value), there is often only one file to read, so there is no need to issue a spark job to do it. In this case, we can read it from driver directly rather issuing a spark job. This could reduce the infer schema latency from several hundreds milliseconds to around around ten milliseconds in my environment.



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