* Rescheduler relies on taints, which were changed in a backward incompatible way. Rescheduler 0.3 shipped together with Kubernetes 1.6 understands the new taints and will clean up the old annotations, but Rescheduler 0.2 shipped together with Kubernetes 1.5 doesn't understand the new taints. In order to avoid eviction loop during 1.5->1.6 upgrade you need to...

* Fix a bug in scheduler happening after retrying unsuccessful bindings ([#37293](https://github.com/kubernetes/kubernetes/pull/37293), [@wojtek-t](https://github.com/wojtek-t))
* Try self-repair scheduler cache or panic ([#37379](https://github.com/kubernetes/kubernetes/pull/37379), [@wojtek-t](https://github.com/wojtek-t))

* Update gcr.io/google-containers/rescheduler to v0.2.2, which uses busybox as a base image instead of ubuntu. ([#41911](https://github.com/kubernetes/kubernetes/pull/41911), [@ixdy](https://github.com/ixdy))

- Performance of the inter-pod affinity/anti-affinity feature is improved over 100X via algorithmic optimization.
- DaemonSet pods, which used to be scheduled by the DaemonSet controller, will be scheduled by the default scheduler in 1.12. This change allows DaemonSet pods to enjoy all the scheduling features of the default scheduler.

    * to be scheduler by default scheduler, instead of Daemonset controller. When it is enabled,
    * the `NodeAffinity` term (instead of `.spec.nodeName`) is added to the DaemonSet Pods;
    * this enables the default scheduler to bind the Pod to the target host. If node affinity
    * of DaemonSet Pod already exists, it will be replaced.

      public @Nullable Void call() throws Exception {
        wrappedRunnable.run();
        reschedule();
        return null;
      }

      /**
       * Atomically reschedules this task and assigns the new future to {@link
       * #cancellationDelegate}.
       */
      @CanIgnoreReturnValue
      Cancellable reschedule() {
        // invoke the callback outside the lock, prevents some shenanigans.

        jobManager.schedule(cron -> register(cron, scheduledJob));
    }

    /**
     * Registers a scheduled job with the specified cron scheduler.
     *
     * @param cron the cron scheduler to use
     * @param scheduledJob the scheduled job to register
     */
    public void register(final LaCron cron, final ScheduledJob scheduledJob) {
        if (scheduledJob == null) {

import org.lastaflute.job.subsidiary.LaunchNowOption;
import org.lastaflute.job.subsidiary.LaunchedProcess;
import org.lastaflute.web.response.JsonResponse;

/**
 * Tests for the scheduler start API endpoint contract.
 * Verifies that {@code PUT /api/admin/scheduler/{id}/start} returns the correct
 * {@code jobLogId} based on the job's logging configuration.
 */
public class ApiAdminSchedulerActionTest extends UnitFessTestCase {

    @Override

          }
        };
    TestCustomScheduler scheduler = new TestCustomScheduler();
    Cancellable future = scheduler.schedule(null, newScheduledThreadPool(10), task);
    firstBarrier.await();
    assertEquals(1, scheduler.scheduleCounter.get());
    secondBarrier.await();
    firstBarrier.await();
    assertEquals(2, scheduler.scheduleCounter.get());
    shouldWait.set(false);
    secondBarrier.await();

          }
        };
    TestCustomScheduler scheduler = new TestCustomScheduler();
    Cancellable future = scheduler.schedule(null, newScheduledThreadPool(10), task);
    firstBarrier.await();
    assertEquals(1, scheduler.scheduleCounter.get());
    secondBarrier.await();
    firstBarrier.await();
    assertEquals(2, scheduler.scheduleCounter.get());
    shouldWait.set(false);
    secondBarrier.await();