Github user wenlong88 commented on a diff in the pull request: https://github.com/apache/flink/pull/3709#discussion_r111308326 --- Diff: flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/ExecutionGraphHolder.java --- @@ -48,7 +52,41 @@ private final FiniteDuration timeout; - private final WeakHashMap<JobID, AccessExecutionGraph> cache = new WeakHashMap<>(); + private AtomicReference<ActorGateway> jobManagerRef = new AtomicReference<>(null); + + private final LoadingCache<JobID, AccessExecutionGraph> cache = + CacheBuilder.newBuilder() + .maximumSize(1000) + .expireAfterWrite(30, TimeUnit.SECONDS) + .build(new CacheLoader<JobID, AccessExecutionGraph>() { + @Override + public AccessExecutionGraph load(JobID jobID) throws Exception { + try { + if (jobManagerRef.get() != null) { + Future<Object> future = jobManagerRef.get().ask(new JobManagerMessages.RequestJob(jobID), timeout); + Object result = Await.result(future, timeout); + + if (result instanceof JobManagerMessages.JobNotFound) { + return null; --- End diff -- CacheLoader do not support return null.
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