Commits on Jun 1, 2018

1. Introduce client feature tracking …

   This commit introduces the ability for a client to communicate to the
   server features that it can support and for these features to be used in
   influencing the decisions that the server makes when communicating with
   the client. To this end we carry the features from the client to the
   underlying stream as we carry the version of the client today. This
   enables us to enhance the logic where we make protocol decisions on the
   basis of the version on the stream to also make protocol decisions on
   the basis of the features on the stream. With such functionality, the
   client can communicate to the server if it is a transport client, or if
   it has, for example, X-Pack installed. This enables us to support
   rolling upgrades from the OSS distribution to the default distribution
   without breaking client connectivity as we can now elect to serialize
   customs in the cluster state depending on whether or not the client
   reports to us using the feature capabilities that it can under these
   customs. This means that we would avoid sending a client pieces of the
   cluster state that it can not understand. However, we want to take care
   and always send the full cluster state during node-to-node communication
   as otherwise we would end up with different understanding of what is in
   the cluster state across nodes depending on which features they reported
   to have. This is why when deciding whether or not to write out a custom
   we always send the custom if the client is not a transport client and
   otherwise do not send the custom if the client is transport client that
   does not report to have the feature required by the custom.
   
   Co-authored-by: Yannick Welsch <yannick@welsch.lu>

   

   jasontedor and ywelsch committed Jun 1, 2018
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2. Remove irrelevant lines from test

   

   jasontedor committed Jun 1, 2018
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3. Add comment on use of TreeSet

   

   jasontedor committed Jun 1, 2018
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4. Remove unneeded parser in test

   

   jasontedor committed Jun 1, 2018
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5. Remove unneeded fields

   

   jasontedor committed Jun 1, 2018
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6. Guard feature de-serialization by version

   

   jasontedor committed Jun 1, 2018
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7. Add Javadocs

   

   jasontedor committed Jun 1, 2018
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8. Randomly add feature to test

   

   jasontedor committed Jun 1, 2018
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9. Change prefix of feature setting

   

   jasontedor committed Jun 1, 2018
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10. Randomize one or none features

    

    jasontedor committed Jun 1, 2018
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11. Revert version change for persistent tasks

    

    jasontedor committed Jun 1, 2018
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