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From "Alexey Kuznetsov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-6012) Improve GridJettyRestHandler.processRequest()
Date Wed, 09 Aug 2017 13:30:00 GMT
Alexey Kuznetsov created IGNITE-6012:

             Summary: Improve GridJettyRestHandler.processRequest()
                 Key: IGNITE-6012
                 URL: https://issues.apache.org/jira/browse/IGNITE-6012
             Project: Ignite
          Issue Type: Improvement
          Components: rest
    Affects Versions: 2.1
            Reporter: Alexey Kuznetsov
            Assignee: Alexey Kuznetsov
             Fix For: 2.2

In case of large result  
private void processRequest(String act, HttpServletRequest req, HttpServletResponse res) {
json = jsonMapper.writeValueAsString(cmdRes)

Will fail with OOME, beacuse jsonMapper.writeValueAsString(cmdRes) internally will create
a StringBuilder and will try to allocate large amount of memory.

This could be easily fixed by writing object directly to response output stream via. 
jsonMapper.writeValue(out, cmdRes);

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