[jira] [Created] (SPARK-7366) Support multi-line JSON objects via a depth hint

["Joe Halliwell (JIRA)" <ji...@apache.org>]

Joe Halliwell created SPARK-7366:
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             Summary: Support multi-line JSON objects via a depth hint 
                 Key: SPARK-7366
                 URL: https://issues.apache.org/jira/browse/SPARK-7366
             Project: Spark
          Issue Type: Improvement
          Components: Input/Output
            Reporter: Joe Halliwell
            Priority: Minor


The present object-per-line format for ingesting JSON data has a couple of deficiencies:
1. It's not itself JSON
2. It's often harder for humans to read

The object-per-file format addresses these, but at a cost of producing many files which can be unwieldy.

Since it is feasible to read and write large JSON files via streaming (and many systems do) it seems reasonable to support them directly as an input format.

The key challenge is to find record boundaries without parsing the file from the start i.e. given an offset, locate a nearby boundary. In the general case this is impossible as you can't be sure you've identified the start of a top-level record without tracing back to the start of a file.

However, if you know something about the format of the file i.e. maximum object depth it seems plausible that we can do better.



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