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Metadata (consisting of up to 10 key/value pairs) that you can define and assign to Amazon EC2 resources.
- Browse Related Terms: consistency model, consistent read, eventual consistency, eventually consistent read, gibibyte, Marker, range GET, tag, tebibyte, unit
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An EC2 instance that runs Hadoop map and reduce tasks, but does not store data. Task nodes are managed by the master node, 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.
- Browse Related Terms: bootstrap action, Cascading, core node, Hive, instance group, job flow, Pig, quota, shutdown action, STEP, step type, streaming, task node, tuning
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A contraction of tera binary byte, a tebibyte is 2^40 bytes or 1,099,511,627,776 bytes. A terabyte is 10^12 or 1,000,000,000,000 bytes.
- Browse Related Terms: consistency model, consistent read, eventual consistency, eventually consistent read, gibibyte, Marker, range GET, tag, tebibyte, unit
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The version of an AWS CloudFormation template design that determines the available features. If you omit the AWSTemplateFormatVersion section from your template, AWS CloudFormation assumes the most recent format version.
- Browse Related Terms: format version, intrinsic function, logical name, mapping, NoEcho, property rule, pseudo parameter, template format version, template validation, Validation
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The process of confirming the use of JSON code in an AWS CloudFormation template. You can validate any AWS CloudFormation template using the cfn-validate-template command.
- Browse Related Terms: format version, intrinsic function, logical name, mapping, NoEcho, property rule, pseudo parameter, template format version, template validation, Validation
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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 CloudWatch 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.
- Browse Related Terms: Action, Amazon CloudWatch, basic monitoring, CloudWatch, cooldown period, detailed monitoring, dimension, metric, metric name, operation, sampling period, time series data, unbounded, Web Services Description Language (WSDL)
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A date/time string in ISO 8601 format.
- Browse Related Terms: alarm, Breach, Canonical Name Record (CNAME), function, Period, Query, Representational State Transfer (REST), REST-Query, statistic, string-to-sign, time stamp, visibility timeout
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A communication channel to send messages and subscribe to notifications. It provides an access point for publishers and subscribers to communicate with each other.
- Browse Related Terms: Amazon Payments, co-branding, Donation button, Internet Service Provider (ISP), mailbox provider, Premium Support, Standard button, Subscription button, topic
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A cryptographic protocol that provides security for communication over the Internet. Its predecessor is Secure Sockets Layer (SSL).
- Browse Related Terms: Border Gateway Protocol Autonomous System Number (BGP ASN), Classless Inter-Domain Routing (CIDR) block, DB security group, Domain Name System (DNS), Internet gateway, main route table, NAT instance, network ACL, private subnet, public subnet, route table, security group, source/destination checking, subnet, Transport Layer Security (TLS), Tunnel
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Selecting the number and type of AMIs to run a Hadoop job flow most efficiently.
- Browse Related Terms: bootstrap action, Cascading, core node, Hive, instance group, job flow, Pig, quota, shutdown action, STEP, step type, streaming, task node, tuning
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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.
- Browse Related Terms: Border Gateway Protocol Autonomous System Number (BGP ASN), Classless Inter-Domain Routing (CIDR) block, DB security group, Domain Name System (DNS), Internet gateway, main route table, NAT instance, network ACL, private subnet, public subnet, route table, security group, source/destination checking, subnet, Transport Layer Security (TLS), Tunnel
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