AWS Snowball User Guide
to make predictions on new data. For example, if you were building a model for
predicting the sale price of a house, the target attribute would be “target sale
price in USD.”
target revision AWS CodeDeploy (CodeDeploy) (p. 116): The most recent version of the
application revision that has been uploaded to the repository and will be
deployed to the instances in a deployment group. In other words, the application
revision currently targeted for deployment. This is also the revision that will be
pulled for automatic deployments.
task An instantiation of a task definition (p. 156) that is running on a container
instance (p. 125).
task definition The blueprint for your task. Specifies the name of the task (p. 156), revisions,
container definition (p. 125)s, and volume (p. 158) information.
task node An EC2 instance (p. 129) that runs Hadoop (p. 134) map and reduce tasks,
but does not store data. Task nodes are managed by the master node (p. 140),
which assigns Hadoop tasks to nodes and monitors their status. While a job flow
is running you can increase and decrease the number of task nodes. Because they
don't store data and can be added and removed from a job flow, you can use task
nodes to manage the EC2 instance capacity your job flow uses, increasing capacity
to handle peak loads and decreasing it later.
Task nodes only run a TaskTracker Hadoop daemon.
tebibyte A contraction of tera binary byte, a tebibyte is 2^40 or 1,099,511,627,776
bytes. A terabyte (TB) is 10^12 or 1,000,000,000,000 bytes. 1,024 TiB is a
pebibyte (p. 144).
template format version The version of an AWS CloudFormation (p. 116) template design that
determines the available features. If you omit the AWSTemplateFormatVersion
section from your template, AWS CloudFormation assumes the most recent
format version.
template validation The process of confirming the use of JSON (p. 137) code in an AWS
CloudFormation (p. 116) template. You can validate any AWS CloudFormation
template using the cfn-validate-template command.
temporary security
credentials
Authentication information that is provided by AWS STS (p. 120) when you
call an STS API action. Includes an access key ID (p. 108), a secret access
key (p. 151), a session (p. 151) token, and an expiration time.
throttling The automatic restricting or slowing down of a process based on one or more
limits. Examples: Amazon Kinesis Data Streams (p. 112) throttles operations if
an application (or group of applications operating on the same stream) attempts
to get data from a shard at a rate faster than the shard limit. Amazon API
Gateway (p. 109) uses throttling to limit the steady-state request rates for a
single account. Amazon SES (p. 113) uses throttling to reject attempts to send
email that exceeds the sending limits (p. 151).
time series data Data provided as part of a metric. The time value is assumed to be when the value
occurred. A metric is the fundamental concept for Amazon CloudWatch (p. 110)
and represents a time-ordered set of data points. You publish metric data points
into CloudWatch and later retrieve statistics about those data points as a time-
series ordered data set.
time stamp A date/time string in ISO 8601 format.
TLS See Transport Layer Security.
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