Is the necessary condition the same as the sufficient condition?

Indeed, the claim about the necessary condition is simply another way of putting the claim about the sufficient condition, just as the contrapositive of a formula is logically equivalent to the original formula.

Why do I get insufficient capacity error when launching an instance?

If you are launching instances into a cluster placement group, you can get an insufficient capacity error. For more information, see Placement group rules and limitations . The requested configuration is currently not supported. Please check the documentation for supported configurations.

How to create a status check for an instance?

In the navigation pane, choose Instances . Select the instance, choose the Status Checks tab, and choose Create Status Check Alarm . Select Send a notification to. Choose an existing SNS topic, or choose create topic to create a new one.

Why do I get an insufficientinstancecapacity error?

You get the InsufficientInstanceCapacity error when you try to launch a new instance or restart a stopped instance. If you get this error when you try to launch an instance or restart a stopped instance, AWS does not currently have enough available On-Demand capacity to fulfill your request.

How to get a condition instance of a lock?

A Condition instance is intrinsically bound to a lock. To obtain a Condition instance for a particular Lock instance use its newCondition() method. As an example, suppose we have a bounded buffer which supports put and take methods.

In the navigation pane, choose Instances . Select the instance, choose the Status Checks tab, and choose Create Status Check Alarm . Select Send a notification to. Choose an existing SNS topic, or choose create topic to create a new one.

How does waiting for a condition work in Java?

The key property that waiting for a condition provides is that it atomically releases the associated lock and suspends the current thread, just like Object.wait. A Condition instance is intrinsically bound to a lock. To obtain a Condition instance for a particular Lock instance use its newCondition() method.

Indeed, the claim about the necessary condition is simply another way of putting the claim about the sufficient condition, just as the contrapositive of a formula is logically equivalent to the original formula.