AWS Snowball User Guide
tokenization The process of splitting a stream of text into separate tokens on detectable
boundaries such as whitespace and hyphens.
topic A communication channel to send messages and subscribe to notifications. It
provides an access point for publishers and subscribers to communicate with each
other.
training datasource A datasource that contains the data that Amazon Machine Learning uses to train
the machine learning model to make predictions.
transition AWS CodePipeline (p. 117): The act of a revision in a pipeline continuing from
one stage to the next in a workflow.
Transport Layer Security A cryptographic protocol that provides security for communication over the
internet. Its predecessor is Secure Sockets Layer (SSL).
trust policy An IAM (p. 118) policy (p. 144) that is an inherent part of an IAM
role (p. 149). The trust policy specifies which principal (p. 145)s are allowed to
use the role.
trusted signers AWS account (p. 109)s that the CloudFront (p. 110) distribution owner has
given permission to create signed URLs for a distribution's content.
tuning Selecting the number and type of AMIs (p. 112) to run a Hadoop (p. 134) job
flow most efficiently.
tunnel A route for transmission of private network traffic that uses the internet to
connect nodes in the private network. The tunnel uses encryption and secure
protocols such as PPTP to prevent the traffic from being intercepted as it passes
through public routing nodes.
U
Numbers and Symbols (p. 108) | A (p. 108) | B (p. 121) | C (p. 122) | D (p. 126) | E (p. 129) | F (p. 132) |
G (p. 133) | H (p. 134) | I (p. 135) | J (p. 137) | K (p. 137) | L (p. 138) | M (p. 139) | N (p. 141) | O (p. 142)
| P (p. 143) | Q (p. 146) | R (p. 146) | S (p. 149) | T (p. 155) | U (p. 157) | V (p. 158) | W (p. 159) | X, Y,
Z (p. 159)
unbounded The number of potential occurrences is not limited by a set number. This
value is often used when defining a data type that is a list (for example,
maxOccurs="unbounded"), in WSDL (p. 159).
unit Standard measurement for the values submitted to Amazon
CloudWatch (p. 110) as metric data. Units include seconds, percent, bytes, bits,
count, bytes/second, bits/second, count/second, and none.
unlink from VPC The process of unlinking (or detaching) an EC2-Classic instance (p. 136) from a
ClassicLink-enabled VPC (p. 159).
See Also ClassicLink, link to VPC.
usage report An AWS record that details your usage of a particular AWS service. You can
generate and download usage reports from https://aws.amazon.com/usage-
reports/.
user A person or application under an account (p. 109) that needs to make API calls
to AWS products. Each user has a unique name within the AWS account, and a set
of security credentials not shared with other users. These credentials are separate
from the AWS account's security credentials. Each user is associated with one and
only one AWS account.
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