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Created by MOE: https://github.com/google/moe
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Ben McIlwain 2016-10-10 15:12:45 -07:00
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18
docs/app-engine-architecture.md
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@ -79,11 +79,11 @@ https://tools-dot-project-id.appspot.com, like `/_dr/task/refreshAllDomains`.
Engine provide an asynchronous way to enqueue tasks and then execute them on Engine provide an asynchronous way to enqueue tasks and then execute them on
some kind of schedule. There are two types of queues, push queues and pull some kind of schedule. There are two types of queues, push queues and pull
queues. Tasks in push queues are always executing up to some throttlable limit. queues. Tasks in push queues are always executing up to some throttlable limit.
Tasks in pull queues remain there indefinitely until the queue is polled by code Tasks in pull queues remain there until the queue is polled by code that is
that is running for some other reason. Essentially, push queues run their own running for some other reason. Essentially, push queues run their own tasks
tasks while pull queues just enqueue data that is used by something else. Many while pull queues just enqueue data that is used by something else.
other parts of App Engine are implemented using task queues. For example, [App Many other parts of App Engine are implemented using task queues. For example,
Engine cron](https://cloud.google.com/appengine/docs/java/config/cron) adds [App Engine cron](https://cloud.google.com/appengine/docs/java/config/cron) adds
tasks to push queues at regularly scheduled intervals, and the [MapReduce tasks to push queues at regularly scheduled intervals, and the [MapReduce
framework](https://cloud.google.com/appengine/docs/java/dataprocessing/) adds framework](https://cloud.google.com/appengine/docs/java/dataprocessing/) adds
tasks for each phase of the MapReduce algorithm. tasks for each phase of the MapReduce algorithm.
@ -159,10 +159,10 @@ explicitly marked as otherwise.
`SyncGroupMembersAction`. `SyncGroupMembersAction`.
* `load[0-9]` -- Queues used to load-test the system by `LoadTestAction`. * `load[0-9]` -- Queues used to load-test the system by `LoadTestAction`.
These queues don't need to exist except when actively running load tests These queues don't need to exist except when actively running load tests
(which is not recommended on production environments). There are ten of (running load tests on production environments is not recommended). There
these queues to provide simple sharding, because Nomulus is capable of are ten of these queues to provide simple sharding, because Nomulus is
handling significantly more Queries Per Second than the highest throttle capable of handling significantly more Queries Per Second than the highest
limit available on task queues (which is 500 qps). throttle limit available on task queues (which is 500 qps).
* `lordn-claims` and `lordn-sunrise` -- Pull queues for handling LORDN * `lordn-claims` and `lordn-sunrise` -- Pull queues for handling LORDN
exports. Tasks are enqueued synchronously during EPP commands depending on exports. Tasks are enqueued synchronously during EPP commands depending on
whether the domain name in question has a claims notice ID. whether the domain name in question has a claims notice ID.