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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