H Flashcards
Hadoop
Software that enables distributed processing for big data by using clusters and simple programming models. For more information, see http://hadoop.apache.org.
hard bounce
A persistent email delivery failure such as “mailbox does not exist.”
hardware VPN
A hardware-based IPsec VPN connection over the internet.
health check
A system call to check on the health status of each instance in an Auto Scaling group.
high-quality email
Email that recipients find valuable and want to receive. Value means different things to different recipients and can come in the form of offers, order confirmations, receipts, newsletters, etc.
highlights
Amazon CloudSearch: Excerpts returned with search results that show where the search terms appear within the text of the matching documents.
highlight enabled
Amazon CloudSearch: An index field option that enables matches within the field to be highlighted.
hit
A document that matches the criteria specified in a search request. Also referred to as a search result.
HMAC
Hash-based Message Authentication Code. A specific construction for calculating a message authentication code (MAC) involving a cryptographic hash function in combination with a secret key. You can use it to verify both the data integrity and the authenticity of a message at the same time. AWS calculates the HMAC using a standard, cryptographic hash algorithm, such as SHA-256.
hosted zone
A collection of resource record sets that Amazon Route 53 hosts. Like a traditional DNS zone file, a hosted zone represents a collection of records that are managed together under a single domain name.
HVM virtualization
Hardware Virtual Machine virtualization. Allows the guest VM to run as though it is on a native hardware platform, except that it still uses paravirtual (PV) network and storage drivers for improved performance.
See Also PV virtualization.
