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Add disk based edge caching support. (#5182)

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This PR adds disk based edge caching support for minio server.

Cache settings can be configured in config.json to take list of disk drives,
cache expiry in days and file patterns to exclude from cache or via environment
variables MINIO_CACHE_DRIVES, MINIO_CACHE_EXCLUDE and MINIO_CACHE_EXPIRY

Design assumes that Atime support is enabled and the list of cache drives is
fixed.
 - Objects are cached on both GET and PUT/POST operations.
 - Expiry is used as hint to evict older entries from cache, or if 80% of cache
   capacity is filled.
 - When object storage backend is down, GET, LIST and HEAD operations fetch
   object seamlessly from cache.

Current Limitations
 - Bucket policies are not cached, so anonymous operations are not supported in
   offline mode.
 - Objects are distributed using deterministic hashing among list of cache
   drives specified.If one or more drives go offline, or cache drive
   configuration is altered - performance could degrade to linear lookup.

Fixes #4026
This commit is contained in:
poornas
2018-03-28 14:14:06 -07:00
committed by kannappanr
parent 2f9354b17e
commit a3e806ed61
60 changed files with 3544 additions and 82 deletions
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18
cmd/test-utils_test.go
View File

@@ -545,6 +545,14 @@ func resetGlobalHealState() {
}
}
}
func resetGlobalCacheEnvs() {
globalIsDiskCacheEnabled = false
}
// sets globalObjectAPI to `nil`.
func resetGlobalCacheObjectAPI() {
globalCacheObjectAPI = nil
}
// Resets all the globals used modified in tests.
// Resetting ensures that the changes made to globals by one test doesn't affect others.
@@ -567,6 +575,10 @@ func resetTestGlobals() {
resetGlobalStorageEnvs()
// Reset global heal state
resetGlobalHealState()
//Reset global disk cache flags
resetGlobalCacheEnvs()
//set globalCacheObjectAPI to nil
resetGlobalCacheObjectAPI()
}
// Configure the server for the test run.
@@ -2199,13 +2211,17 @@ func registerAPIFunctions(muxRouter *router.Router, objLayer ObjectLayer, apiFun
bucketRouter := apiRouter.PathPrefix("/{bucket}").Subrouter()
// All object storage operations are registered as HTTP handlers on `objectAPIHandlers`.
// When the handlers get a HTTP request they use the underlyting ObjectLayer to perform operations.
// When the handlers get a HTTP request they use the underlying ObjectLayer to perform operations.
globalObjLayerMutex.Lock()
globalObjectAPI = objLayer
globalObjLayerMutex.Unlock()
// When cache is enabled, Put and Get operations are passed
// to underlying cache layer to manage object layer operation and disk caching
// operation
api := objectAPIHandlers{
ObjectAPI: newObjectLayerFn,
CacheAPI: newCacheObjectsFn,
}
// Register ListBuckets handler.