CMSC 433Dec 11thCourse Evaluations•http://www.courseevalum.umd.edu•Friday, 8-10 am•I’ll bring doughnuts•You may bring one page of notes•8.5 x 11 inches, double sided•any resolutionFinal ExamUpdates•David has office hours 11am-3pm today•Configuration problem on build server should be fixed momentarily•Project due at 6pm (late deadline sunrise tomorrow)Material•Stuff from Midterm•Concurrency Abstractions •Security•Distributed Computing•Map ReduceConcurrency Abstractions•Semaphore•CountDownLatch•CyclicBarrier•AtomicXXX•Executors•Future•ConcurrentHashMap, CopyOnWriteArrayListSecurity•Untrusted input•Buffer overflows•Format string vulnerabilities•SQL Injection•Cross site scripting•Appending strings to file pathsDistributed Computing•Read “Introduction to distributed system design” and “A Note on Distributed Computing”, Wikipedia: “Fallacies_of_Distributed_Computing”•you are responsible for having read them and for the content contained in themTechnologies•Remote Procedure Call and Remote Method Invocation•Object serialization and marshaling•Proxies•SOAP•RESTMap Reduce•You are responsible for reading the MapReduce paper•What Mappers and Reducers do•How MapReduce handles failure and slowness•All the stuff you needed for project 4Project 4•Read the project 4 FAQProject 4 undesirable shortcuts•sorting phase1 to phase 2 on the Master•Only using a single thread on the master•only one task at a time is being worked on•Not ensuring that there is only a single call to the reducer for each key•Current public tests don’t check these, but they will matter for the final 13 points (and the
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