[jira] [Created] (FLINK-15790) Make FlinkKubeClient and its implementations asynchronous

["Till Rohrmann (Jira)" <ji...@apache.org>]

Till Rohrmann created FLINK-15790:
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             Summary: Make FlinkKubeClient and its implementations asynchronous
                 Key: FLINK-15790
                 URL: https://issues.apache.org/jira/browse/FLINK-15790
             Project: Flink
          Issue Type: Sub-task
          Components: Deployment / Kubernetes
    Affects Versions: 1.10.0
            Reporter: Till Rohrmann
             Fix For: 1.11.0, 1.10.1


The {{FlinkKubeClient}} interface offers several methods which are synchronous (e.g. {{FlinkKubeClient.createTaskManagerPod}}, {{FlinkKubeClient.stopPod}}, {{FlinkKubeClient.getPodsWithLabels}}, etc). The problem is that these methods are directly used by the {{KubernetesResourceManager}} which calls them from the main thread. Since these methods perform I/O operations (sending and receiving network packages) they can potentially block the execution and hence should not happen from the {{RpcEndpoint's}} main thread.

I propose to make all potentially blocking operations on the {{FlinkKubeClient}} asynchronous so that the {{KubernetesResourceManager}} does not risk to block the main thread. Alternatively, we could also introduce a {{FlinkKubeClientAsync}} which offers asynchronous operations.



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