Created
June 11, 2012 16:23
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Wrapper around elastic-mapreduce to make it easier to use
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#!/usr/bin/env python | |
EMR_COMMAND = os.path.expanduser('~/elastic-mapreduce/elastic-mapreduce') | |
EMR_LOGGING_DIR = "s3://songkick/emr-logs" | |
def create_pig_job_flow(pigscript, num_instances=1, extraArguments=[]): | |
jobname = "Pig_Daily_" + datetime.datetime.now().strftime('%Y%m%d-%H%M%S') | |
print "Creating pig job flow", jobname, pigscript | |
args = [EMR_COMMAND, | |
"--create", | |
"--name", jobname, | |
"--num-instances", str(num_instances), | |
"--plain-output", | |
"--log-uri", "%s/%s" % (EMR_LOGGING_DIR, jobname), | |
"--pig-script", str(pigscript)] | |
for extraArgument in extraArguments: | |
args.append("--arg") | |
args.append(str(extraArgument)) | |
jobid = subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0].strip() | |
print "Job Id:", jobid | |
return jobid | |
def get_job_description(jobid): | |
output = subprocess.Popen([EMR_COMMAND, "--describe", "-j", jobid], stdout=subprocess.PIPE).communicate()[0] | |
job_description = json.loads(output)['JobFlows'][0] | |
return job_description | |
def wait_for_job_completion(jobid): | |
running = True | |
state = None | |
while running: | |
job_description = get_job_description(jobid) | |
status_detail = job_description['ExecutionStatusDetail'] | |
if state != status_detail['State']: | |
state = status_detail['State'] | |
print datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'), "state:", state | |
if status_detail['EndDateTime'] is not None: | |
running = False | |
else: | |
time.sleep(30) | |
def check_step_status(jobid): | |
job_description = get_job_description(jobid) | |
print 'Steps:' | |
failed = False | |
for step in job_description['Steps']: | |
step_name = step['StepConfig']['Name'] | |
step_state = step['ExecutionStatusDetail']['State'] | |
if step_state == 'FAILED' or step_state == 'CANCELLED': | |
failed = True | |
print '-',step_name,'\t',step_state | |
if failed: | |
sys.exit(1) | |
if __name__ == '__main__': | |
pigscript = sys.argv[1] | |
if len(sys.argv) > 2: | |
args = sys.argv[2:] | |
else: | |
args = [] | |
jobid = create_pig_job_flow(pigscript, extraArguments=args) | |
wait_for_job_completion(jobid) | |
check_step_status(jobid) |
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