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February 9, 2016 21:05
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Makes precise changes to Kafka topic partitioning config. Supports changing replication factor.
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| #!/usr/bin/python | |
| import sys, argparse, json, random | |
| def main(argv): | |
| parser = argparse.ArgumentParser(description='Repartitioner.') | |
| parser.add_argument('input', help='current partitioning info file') | |
| parser.add_argument('output', help='output partitioning info file') | |
| parser.add_argument('brokers', help='brokers list') | |
| parser.add_argument('--replication-factor', type=int, help='replication factor') | |
| args = parser.parse_args() | |
| brokers = map(lambda x: int(x), args.brokers.split(",")) | |
| with open(args.input) as infile: | |
| conf = json.loads(infile.read()) | |
| for p in conf["partitions"]: | |
| replicas = p["replicas"] | |
| targetRf = len(replicas) if args.replication_factor == None else args.replication_factor | |
| newReplicas = list() | |
| for r in replicas: | |
| if r in brokers and len(newReplicas) < targetRf: | |
| newReplicas.append(r) | |
| if len(newReplicas) < targetRf: | |
| for i in range(len(newReplicas), targetRf): | |
| newReplicas.append(random.choice(list(set(brokers) - set(newReplicas)))) | |
| p["replicas"] = newReplicas | |
| with open(args.output, 'w') as outfile: | |
| json.dump(conf, outfile) | |
| if __name__ == "__main__": | |
| main(sys.argv[1:]) |
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