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From "Valentin Kulichenko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-7092) Deprecate embedded mode in IgniteRDD
Date Fri, 01 Dec 2017 20:42:00 GMT
Valentin Kulichenko created IGNITE-7092:

             Summary: Deprecate embedded mode in IgniteRDD
                 Key: IGNITE-7092
                 URL: https://issues.apache.org/jira/browse/IGNITE-7092
             Project: Ignite
          Issue Type: Improvement
          Components: spark
    Affects Versions: 2.3
            Reporter: Valentin Kulichenko
            Assignee: Valentin Kulichenko
             Fix For: 2.4

Currently we claim to support IgniteRDD in two modes: standalone and embedded. Standalone
means there is a separately running Ignite cluster, and Spark start client node(s) to interact
with it. In embedded node everything runs within Spark, including Ignite server nodes that
are started embedded into Spark executors.

The latter case doesn't really work, mainly because the lifecycle of Spark executors is not
very predictable - Spark can start and stop them while application is running. In case Ignite
cluster is used to store data (which is usually the case), this causes unnecessary rebalancing
or even unexpected data loss.

I propose to deprecate and eventually discontinue the embedded mode. Luckily, standalone mode
is the default one, so we can simply print out a clear warning if one switches to embedded
mode, and also mention this in the docs.

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