Kafka参数影响及性能测试_tom_fans的博客-CSDN博客

Kafka提供了2个测试脚本，kafka-producer-perf-test.sh以及kafka-consumer-perf-test.sh,  kafka参数非常多，有些使用默认即可，有些对性能影响极大，只有经过测试，你才能够对这些参数有直观的感觉。 下面我们先测试producer.

先看看producer脚本怎么使用：

      [hdfs@namenode02 tmp]$  /opt/cloudera/parcels/KAFKA/lib/kafka/bin/kafka-producer-perf-test.sh
usage: producer-performance [-h] --topic TOPIC --num-records NUM-RECORDS --record-size RECORD-SIZE --throughput THROUGHPUT
                            --producer-props PROP-NAME=PROP-VALUE [PROP-NAME=PROP-VALUE ...]

This tool is used to verify the producer performance.

optional arguments:
  -h, --help             show this help message and exit
  --topic TOPIC          produce messages to this topic
  --num-records NUM-RECORDS
                         number of messages to produce
  --record-size RECORD-SIZE
                         message size in bytes
  --throughput THROUGHPUT
                         throttle maximum message throughput to *approximately* THROUGHPUT messages/sec
  --producer-props PROP-NAME=PROP-VALUE [PROP-NAME=PROP-VALUE ...]
                         kafka producer related configuaration properties like bootstrap.servers,client.id etc..
[hdfs@namenode02 tmp]$

默认测试命令如下， 发送100000条记录，每个记录100 bytes

      /opt/cloudera/parcels/KAFKA/lib/kafka/bin/kafka-producer-perf-test.sh --topic jlwang --num-records 1000000 --record-size 100 --producer-props  bootstrap.servers=datanode04.isesol.com:9092 --throughput 1000000

buffer.memory = 33554432              这个就是消息缓存，producer发消息默认先发给buffer

block.on.buffer.full = false                如果发送的消息量太大，撑满了buffer怎么办？ 我相信kafka会有清理 buffer的功能，但是如果即使清理也赶不到发送速度呢？ 这个参数的

                                                              意义就是如果出现这个情况，是堵塞发送，还是报错？

request.timeout.ms = 30000

acks = 1

retries = 0

max.request.size = 1048576

linger.ms = 0                                    

batch.size = 16384

接下来我们主要测试 batch, buffer, ack, linger.ms的影响。

默认：

1000000 records sent, 288184.438040 records/sec (27.48 MB/sec), 574.34 ms avg latency, 918.00 ms max

acks=all :

1000000 records sent, 121212.121212 records/sec (11.56 MB/sec), 1566.87 ms avg latency, 2640.00 ms max latency

acks=all, linger.ms=100ms :

1000000 records sent, 128188.693757 records/sec (12.23 MB/sec), 1506.37 ms avg latency, 1960.00 ms max latency

buffer.memory=100000 :

1000000 records sent, 66427.527567 records/sec (6.34 MB/sec), 1.06 ms avg latency, 307.00 ms max latency

batch.size=1, acks=1 :

16669 records sent, 3333.8 records/sec (0.32 MB/sec), 2587.5 ms avg latency, 4303.0 max latency.

随后报错：org.apache.kafka.common.errors.TimeoutException: Batch Expired   生产的数据速度远远超过发送速度，导致失败timeout，然后失败。

其实已经不用测了，上面这几个参数对整个发送性能都有相当大的影响， 如果发送量很大，可以考虑增加buffer, batch.size, linger.ms的值，acks设置为1.  至于设置多大，坦白说我觉得给个double就行了，也不需要太大。 如果发送量不大，其实默认值kafka给的很不错，可以应付大部分系统。

另外要提一点record.size也严重影响发送速度，生产上尽量避免太大的record.size， 看下面测试结果，我设置record.size=10000,速度严重不行

24499 records sent, 4899.8 records/sec (46.73 MB/sec), 364.1 ms avg latency, 748.0 max latency.
28500 records sent, 5700.0 records/sec (54.36 MB/sec), 346.4 ms avg latency, 742.0 max latency.
28134 records sent, 5626.8 records/sec (53.66 MB/sec), 363.0 ms avg latency, 806.0 max latency.
28037 records sent, 5607.4 records/sec (53.48 MB/sec), 362.7 ms avg latency, 821.0 max latency.
23201 records sent, 4640.2 records/sec (44.25 MB/sec), 429.9 ms avg latency, 1088.0 max latency.
17055 records sent, 3411.0 records/sec (32.53 MB/sec), 605.7 ms avg latency, 1361.0 max latency.
21415 records sent, 4283.0 records/sec (40.85 MB/sec), 490.0 ms avg latency, 1019.0 max latency.
26560 records sent, 5312.0 records/sec (50.66 MB/sec), 383.6 ms avg latency, 853.0 max latency.
23193 records sent, 4638.6 records/sec (44.24 MB/sec), 446.7 ms avg latency, 1225.0 max latency.
26156 records sent, 5231.2 records/sec (49.89 MB/sec), 387.6 ms avg latency, 1068.0 max latency.
28024 records sent, 5604.8 records/sec (53.45 MB/sec), 372.2 ms avg latency, 855.0 max latency.
27209 records sent, 5441.8 records/sec (51.90 MB/sec), 377.0 ms avg latency, 842.0 max latency.

对于consumer就不做具体测试了，主要是因为影响参数没那么多，receive.buffer.bytes，auto.offset.reset，max.partition.fetch.bytes，fetch.min.bytes，isolation.level，max.poll.interval.ms，receive.buffer.bytes，request.timeout.ms  

估计真正会设置的几个参数也就这个，其他基本都不太用。