[GitHub] storm pull request #2228: STORM-2646 NimbusClient Class cast exception when ...

[ecararus <gi...@git.apache.org>]

Github user ecararus commented on a diff in the pull request:

    https://github.com/apache/storm/pull/2228#discussion_r128377962
  
    --- Diff: storm-client/src/jvm/org/apache/storm/utils/NimbusClient.java ---
    @@ -109,12 +109,13 @@ public static NimbusClient getConfiguredClientAs(Map<String, Object> conf, Strin
             }
     
             List<String> seeds;
    -        if(conf.containsKey(Config.NIMBUS_HOST)) {
    +        if (conf.containsKey(Config.NIMBUS_HOST)) {
                 LOG.warn("Using deprecated config {} for backward compatibility. Please update your storm.yaml so it only has config {}",
    -                     Config.NIMBUS_HOST, Config.NIMBUS_SEEDS);
    +                    Config.NIMBUS_HOST, Config.NIMBUS_SEEDS);
                 seeds = Lists.newArrayList(conf.get(Config.NIMBUS_HOST).toString());
             } else {
    -            seeds = (List<String>) conf.get(Config.NIMBUS_SEEDS);
    +            Object nimbusSeeds = conf.get(Config.NIMBUS_SEEDS);
    +            seeds = nimbusSeeds instanceof String[] ? Lists.newArrayList((String[]) nimbusSeeds) : Lists.newArrayList(nimbusSeeds.toString());
    --- End diff --
    
    @d2r I don't think that ```conf.get(Config.NIMBUS_SEEDS)``` will return List<String> as per contract the values in conf is Object. in order to avoid any issue probably is better to have a config validation as @revans2 suggested. 


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