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  1. CouchDB
  2. COUCHDB-354

Ungraceful behaviour if view returns a function


    • Type: Improvement
    • Status: Reopened
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: JavaScript View Server
    • Labels:
    • Environment:
    • Skill Level:
      Regular Contributors Level (Easy to Medium)


      If a typo in a view definition causes it to return a function instead of a normal value:

      • the view server crashes
      • you get a huge Erlang barf in the log with worrying messages like "OS process timed out" and "brutal kill"

      I got all this just by accidentally writing "vs.shift" instead of "vs.shift()"

      The fundamental problem is that a function cannot be serialised in toJSON, but the error message is not helpful:

      OS Process Log Message: Error converting object to JSON: TypeError: {Array:function (v) {var ... snip loads ... "Object"] is not a function

      When actually the problem is that the object I was trying to convert was a function

      I will attach some code which replicates this, and the barf generated.

      Of course this is entirely down to user error in an invalid map/reduce function. However there's already a clean error for 'undefined', maybe this could be done for 'function' too (or indeed any non-serialisable entity)


        1. test_reduce_barf.rb
          1 kB
          Brian Candler
        2. barf.log
          9 kB
          Brian Candler



            • Assignee:
              candlerb Brian Candler
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