def runHadoopStreamingJobSerially(input,output,mapperCommand,reducerCommand=None):
tmpMapperOutFile = output + "/" + "mapper-out"
reducerOutFile = output + "/" + "part-00000"
LinuxUtils.mkdir(output) #output dir should not exist prior to job execution
LinuxUtils.rmPath(tmpMapperOutFile)
for filename in os.listdir(input):
inputFilePath = input + "/" + filename
mapCommand = ["cat",inputFilePath,"| eval ",mapperCommand,">>",tmpMapperOutFile]
LinuxUtils.runLinuxCommand(" ".join(mapCommand))
if (reducerCommand == None):
LinuxUtils.cpPath(tmpMapperOutFile,reducerOutFile)
else:
redCommand = ["cat",tmpMapperOutFile,"| eval ",reducerCommand,">",reducerOutFile]
LinuxUtils.runLinuxCommand(" ".join(redCommand))
def mergeHDFSFiles(hdfsInputDir,filesNamesPattern,hdfsOutputFilePath):
LinuxUtils.runLinuxCommand("hdfs dfs -cat " + hdfsInputDir + "/" + filesNamesPattern + " | hdfs dfs -put -f - " + hdfsOutputFilePath)
