[jira] [Created] (SOLR-5122) "ArithmeticException: / by zero" using spellcheck.collateMaxCollectDocs

["Hoss Man (JIRA)" <ji...@apache.org>]

Hoss Man created SOLR-5122:
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             Summary: "ArithmeticException: / by zero" using spellcheck.collateMaxCollectDocs
                 Key: SOLR-5122
                 URL: https://issues.apache.org/jira/browse/SOLR-5122
             Project: Solr
          Issue Type: Bug
    Affects Versions: 4.4
            Reporter: Hoss Man


As part of SOLR-4952 SpellCheckCollatorTest started using RandomMergePolicy, and this (aparently) led to a failure in testEstimatedHitCounts.

As far as i can tell: the test assumes that specific values would be returned as the _estimated_ "hits" for a colleation, and it appears that the change in MergePolicy however resulted in different segments with different term stats, causing the estimation code to produce different values then what is expected.

I made a quick attempt to improve the test to:
 * expect explicit exact values only when spellcheck.collateMaxCollectDocs is set such that the "estimate' should actually be exact (ie: collateMaxCollectDocs  == 0 or collateMaxCollectDocs greater then the num docs in the index
 * randomize the values used for collateMaxCollectDocs and confirm that the estimates are never more then the num docs in the index

This lead to an odd "ArithmeticException: / by zero" error in the test, which seems to suggest that there is a genuine bug in the code that only gets tickled in certain mergepolicy/segment/collateMaxCollectDocs combinations.

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