design spark pcb

Spark is no rocket science!—— bloggerKnowing a friend of distributed computing, you must know a concept like dag. I actually contacted the Dag and learned about MapReduce. (See the " Big Data Day: Architecture and Algorithms " book for more details.) Recommended reading. ）DAG, directed acyclic graph. Can be a brain to complement what the DAG is a thing: the direction, no ring, the figure, if only, meaning is really clear. If the DAG is more complex, i

streamidtounallocatedblockqueues, and the Streamid and block queues are encapsulated as allocatedblocks, and finally according to the batchtime the corresponding allocatedblocks objects are added to the timetoallocatedblocks,Timetoallocatedblocks is a hashmap:This allows the block of batch to be allocated for completion. other messages processed by 2.3 receivertrackerin Receivertrackerthe Receivertrackerendpoint Receive method defines the processing logic for various messages:(1) after receivi

information, but as an internal management objectIf you speak from a design pattern, receivertracker and receiverblocktracker, or our RPC communication objects and receiverblocktracker their design patterns are façade (Facet) Design Patterns:Receiverblocktracker: doing things insideReceivertracker: An external communication body or representative.　　　Note:

Start Spark-shell:Simple RDD:The above code uses the SC, which is Spark-shell help us to automatically generate an instance of Sparkcontext:We multiply each element of the generated RDD by 3:All of the above actions are transformations we need to trigger an action to execute:We can see the expected results, but we can see that the collect operation returns an array, so the data is not too much, or oom will

maximum ingestion rate */def sendrateupdate (Streamuid:int, newrate:long): Unit = synchronized { if (istrackerstarted) {endpoint.send (Updatereceiverratelimit (Streamuid, Newrate))}}Case Updatereceiverratelimit (Streamuid, newrate) + = (Info The rate at which the data flow is controlled is finally adjusted by Blockgenerator to adjust the rate at which the message is sent to Receiver,receiver.Case Updateratelimit (EPS) = Loginfo (S "Received a new rate limit: $eps.") Registeredblockgenerators.fo