Placement Groups
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Time
19 hours 19 minutes
Difficulty
Intermediate
CEU/CPE
20
Video Transcription
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>> Hey everybody, welcome back.
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In this lesson, we're going to be talking
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about placement groups and
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what that is for EC2 instances.
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We're going to be describing
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the purpose of placement groups,
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why you want to utilize them,
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and then highlight some of the key
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benefits of utilizing them.
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Let me go ahead and take a step back here.
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When you're launching an EC2 instance,
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the EC2 service is going to attempt
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to place the instance in such a way that
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spreads out the resources across
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all the underlying hardware to minimize failures.
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With placement groups, you can influence how that's being
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done in a couple of ways you can do that is
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through clusters, partitions and spreads.
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Clusters, packs the instances close together
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inside a single availability zone for reduce latency.
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If you're having high traffic between EC2 instances,
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that could be beneficial having a cluster.
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Partitions spreads the instances out
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across logical partitions that don't share the hardware.
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This is common for things like Hadoop, Cassandra, Kafka,
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things like that and then spread designs
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to reduce correlated failures across common hardware.
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Sticking it on different designated pieces of
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hardware runs that EC2 instance.
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That if a hard drive fails,
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it's not knocking out all of your EC2 instances,
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it's just knocking out the one that's running on that.
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Different reasons for having them,
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but that's what placement groups are.
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You're going to want to understand what
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placement groups are.
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Make sure you can describe these different purposes,
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cluster partitioning and spread.
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And I'm going to actually
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attach a link in the description or
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the resource page that provides some context here.
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You can read the documentation on placement groups and
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understand why it's there,
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why you want to use it.
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In case this video wasn't sufficient enough,
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you can actually dig into it yourself.
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That wraps up this lecture.
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I'll see you guys in the next one.
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