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  1. Spark
  2. SPARK-10340

Use S3 bulk listing for S3-backed Hive tables

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Duplicate
    • Affects Version/s: 1.4.1, 1.5.0
    • Fix Version/s: None
    • Component/s: SQL
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      Description

      AWS S3 provides bulk listing API. It takes the common prefix of all input paths as a parameter and returns all the objects whose prefixes start with the common prefix in blocks of 1000.

      Since SPARK-9926 allow us to list multiple partitions all together, we can significantly speed up input split calculation using S3 bulk listing. This optimization is particularly useful for queries like select * from partitioned_table limit 10.

      This is a common optimization for S3. For eg, here is a blog post from Qubole on this topic.

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              • Assignee:
                cheolsoo Cheolsoo Park
                Reporter:
                cheolsoo Cheolsoo Park
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