Sams Teach Yourself Apache Spark™ in 24 Hours

Index

Symbols

<- (assignment operator) in R, 344

A

ABC programming language, 166

abstraction, Spark as, 2

access control lists (ACLs), 503

accumulator() method, 266

accumulators, 265–266

accumulator() method, 266

custom accumulators, 267

in DStreams, 331, 340

usage example, 268–270

value() method, 266

warning about, 268

ACLs (access control lists), 503

actions

aggregate actions, 209

fold(), 210

reduce(), 209

collect(), 207

count(), 206

defined, 47, 206

first(), 208–209

foreach(), 210–211

map() transformation versus, 233

lazy evaluation, 107–108

on RDDs, 92

saveAsHadoopFile(), 251–252

saveAsNewAPIHadoopFile(), 253

saveAsSequenceFile(), 250

saveAsTextFile(), 93, 248

spark-ec2 shell script, 65

take(), 207–208

takeSample(), 199

top(), 208

adjacency ...