The document discusses implementing reliable, isolated, and unified job submission for a distributed stream processing platform. It proposes: 1) Defining job submission and execution as atomic by requiring the job graph to be persisted before a job is considered submitted, and the job status to be set to DONE before a job is considered completed. 2) Compiling jobs in isolation on the cluster side by packaging user programs and dependencies and executing them in isolated containers to avoid bottlenecks and security risks at the client. 3) Exposing a three-layer unified client interface for deployment, cluster, and job management to provide a programmatic submission approach.