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From merrimanr <>
Subject [GitHub] metron pull request #779: METRON-1218: Metron REST should return better erro...
Date Thu, 28 Sep 2017 21:59:44 GMT
GitHub user merrimanr opened a pull request:

    METRON-1218: Metron REST should return better error messages

    ## Contributor Comments
    This PR improves the error handling in the REST app and adds logging to failed searches
in the ElasticsearchDao.  This can be tested in full dev by executing a search against REST
with a value for "from" that is larger than the index.  For example:
      "from": 1000000000,
      "indices": [
      "query": "*",
      "size": 0
    Before it would just return:
      "responseCode": 500,
      "message": "Could not execute search",
      "fullMessage": "Could not execute search"
    but after this change it should instead include the root cause:
      "responseCode": 500,
      "message": "Could not execute search",
      "fullMessage": "Result window is too large, from + size must be less than or equal to:
[10000] but was [100000005]. See the scroll api for a more efficient way to request large
data sets. This limit can be set by changing the [index.max_result_window] index level parameter."
    There should also be the full stacktrace in /var/log/metron/metron-rest.log.  
    This change should improve all error messages that are returned from REST and are not
limited to this case.  I also added a unit test for the REST exception handler class.
    ## Pull Request Checklist
    Thank you for submitting a contribution to Apache Metron.  
    Please refer to our [Development Guidelines](
for the complete guide to follow for contributions.  
    Please refer also to our [Build Verification Guidelines](
for complete smoke testing guides.  
    In order to streamline the review of the contribution we ask you follow these guidelines
and ask you to double check the following:
    ### For all changes:
    - [x] Is there a JIRA ticket associated with this PR? If not one needs to be created at
[Metron Jira](

    - [x] Does your PR title start with METRON-XXXX where XXXX is the JIRA number you are
trying to resolve? Pay particular attention to the hyphen "-" character.
    - [x] Has your PR been rebased against the latest commit within the target branch (typically
    ### For code changes:
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root metron folder via:
      mvn -q clean integration-test install && build_utils/ 
    - [x] Have you written or updated unit tests and or integration tests to verify your changes?
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that is compatible for inclusion under [ASF 2.0](

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    ### For documentation related changes:
    - [x] Have you ensured that format looks appropriate for the output in which it is rendered
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      cd site-book
      mvn site
    #### Note:
    Please ensure that once the PR is submitted, you check travis-ci for build issues and
submit an update to your PR as soon as possible.
    It is also recommended that [travis-ci]( is set up for your personal
repository such that your branches are built there before submitting a pull request.

You can merge this pull request into a Git repository by running:

    $ git pull METRON-1218

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #779
commit 0f061223bc2f0e0a8fb6eedcc3cc56427993c005
Author: merrimanr <>
Date:   2017-09-28T21:53:40Z

    initial commit



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