Hi Jun,
The usage output of bin/kafka-producer-perf-test.sh shows
--request-timeout-ms <Integer> The produce request timeout in ms
(default: 3000)
In my test runs I used the following command-line arguments:
bin/kafka-producer-perf-test.sh --broker-list 10.0.0.8:9092,10.0.0.10:9092
--compression-codec 0 --message-size 1024 --request-num-acks -1 --sync
--messages 100000 -threads 1 --show-detailed-stats --reporting-interval 1000
--topics d2111 | grep -v "at "
I assume producer uses default timeout of 3000ms in my tests.
I ran a few data processing operations on kafka-request.log.*
grep Completed kafka-request.log.2014-01-30-17 | sed 's/^.*totalTime://' | sed
's/,.*$//' > /tmp/times.log
cat /tmp/times.log | sort -k 1n | uniq > /tmp/result.log
tail /tmp/result.log
5643
5761
5834
6319
6320
6535
8407
8554
9422
9502
I guess that means some of Fetch requests from the leader broker to the
follower broker took much longer than 3000ms. That explains expired producer's
requests and probably the overall decrease of the throughput in tests with
acksNum!=1.
What may cause such long responses? Is there a way to address this issue?
Thank you,
Michael Popov
-----Original Message-----
From: Jun Rao [mailto:jun...@gmail.com]
Sent: Friday, January 31, 2014 7:52 AM
To: users@kafka.apache.org
Subject: Re: Kafka performance test: "--request-num-acks -1" kills throughput
Michael,
Those SocketTimeoutExceptions meas that the producer didn't receive the
response from the broker in time. Could you check the request log in the broker
and see what the request completion time is and how it compares with the
request socket timeout?
I did some testing a while back. Latency wise, ack=-1 is about twice that of
ack=1 since it requires an extra network round trip.
Thanks,
Jun
On Thu, Jan 30, 2014 at 11:23 AM, Michael Popov <mpo...@microsoft.com>wrote:
> Hi Jun,
>
> I ran a new new tests today.
>
> Settings: 2 Kafka brokers, 1 Zookeeper node, 4 client machines.
> Creating a new topic with 1 partition for each client process.
> Commands to create a topic looked like this one:
>
> bin/kafka-create-topic.sh --partition 1 --replica 2 --zookeeper
> 10.0.0.4:2181 --topic d1
>
> Commands to run a test producer looked like this:
>
> bin/kafka-producer-perf-test.sh --broker-list 10.0.0.8:9092,
> 10.0.0.10:9092 --compression-codec 0 --message-size 1024
> --request-num-acks 1 --sync --messages 100000 -threads 10
> --show-detailed-stats --reporting-interval 1000 --topics d1 | grep -v "at "
>
> Results of 4 test runs:
> ======================================
> --request-num-acks -1
> =====================================
> 2014-01-30 17:55:01:576, 2014-01-30 17:59:23:294, 0, 1024, 200, 97.66,
> 0.3731, 100000, 382.0906
> 2014-01-30 17:55:01:921, 2014-01-30 18:20:56:952, 0, 1024, 200, 97.66,
> 0.0628, 99999, 64.3068
> 2014-01-30 17:55:00:037, 2014-01-30 18:20:57:164, 0, 1024, 200, 97.66,
> 0.0627, 100000, 64.2208
> 2014-01-30 17:54:59:723, 2014-01-30 18:20:34:633, 0, 1024, 200, 97.66,
> 0.0636, 100000, 65.1504
>
> ======================================
> --request-num-acks 1
> =====================================
> 2014-01-30 18:24:54:588, 2014-01-30 18:27:42:408, 0, 1024, 200, 97.66,
> 0.5819, 100000, 595.8765
> 2014-01-30 18:24:54:830, 2014-01-30 18:27:24:080, 0, 1024, 200, 97.66,
> 0.6543, 100000, 670.0168
> 2014-01-30 18:24:52:855, 2014-01-30 18:25:48:119, 0, 1024, 200, 97.66,
> 1.7671, 100000, 1809.4962
> 2014-01-30 18:24:52:763, 2014-01-30 18:27:45:675, 0, 1024, 200, 97.66,
> 0.5648, 100000, 578.3289
>
> ======================================
> --request-num-acks -1
> =====================================
> 2014-01-30 18:31:08:756, 2014-01-30 18:57:12:123, 0, 1024, 200, 97.66,
> 0.0625, 99998, 63.9632
> 2014-01-30 18:31:08:860, 2014-01-30 18:37:18:634, 0, 1024, 200, 97.66,
> 0.2641, 100000, 270.4355
> 2014-01-30 18:31:06:968, 2014-01-30 18:57:28:389, 0, 1024, 200, 97.66,
> 0.0618, 99999, 63.2336
> 2014-01-30 18:31:06:819, 2014-01-30 18:37:19:703, 0, 1024, 200, 97.66,
> 0.2619, 100000, 268.1799
>
> ======================================
> --request-num-acks 1
> =====================================
> 2014-01-30 19:02:35:171, 2014-01-30 19:05:21:650, 0, 1024, 200, 97.66,
> 0.5866, 100000, 600.6764
> 2014-01-30 19:02:40:264, 2014-01-30 19:05:01:863, 0, 1024, 200, 97.66,
> 0.6897, 100000, 706.2197
> 2014-01-30 19:02:38:537, 2014-01-30 19:03:27:687, 0, 1024, 200, 97.66,
> 1.9869, 100000, 2034.5880
> 2014-01-30 19:02:33:384, 2014-01-30 19:04:51:134, 0, 1024, 200, 97.66,
> 0.7089, 100000, 725.9528
>
>
> There is something seriously wrong with Kafka throughput in "2acks" tests.
> Anything I can do to resolve this issue?
>
> One more thing. Producers kept printing error messages like this
> during the test runs:
> [2014-01-30 18:32:39,777] WARN Failed to send producer request with
> correlation id 51676 to broker 1 with data for partitions [d4111,0]
> (kafka.producer.async.DefaultEventHandler)
> java.net.SocketTimeoutException
> [2014-01-30 18:32:53,308] WARN Produce request with correlation id
> 57999 failed due to [d4111,0]: kafka.common.RequestTimedOutException
> (kafka.producer.async.DefaultEventHandler)
> [2014-01-30 18:33:22,350] WARN Failed to send producer request with
> correlation id 72096 to broker 1 with data for partitions [d4111,0]
> (kafka.producer.async.DefaultEventHandler)
> java.net.SocketTimeoutException
> [2014-01-30 18:33:39,740] WARN Failed to send producer request with
> correlation id 81147 to broker 1 with data for partitions [d4111,0]
> (kafka.producer.async.DefaultEventHandler)
> java.net.SocketTimeoutException
>
> Thank you,
> Michael Popov
>
>
> -----Original Message-----
> From: Jun Rao [mailto:jun...@gmail.com]
> Sent: Wednesday, January 29, 2014 9:01 PM
> To: users@kafka.apache.org
> Subject: Re: Kafka performance test: "--request-num-acks -1" kills
> throughput
>
> Does the result change with just 1 partition?
>
> Thanks,
>
> Jun
>
>
> On Wed, Jan 29, 2014 at 4:06 PM, Michael Popov <mpo...@microsoft.com>
> wrote:
>
> > Hi,
> >
> > We need a reliable low-latency message queue that can scale. Kafka
> > looks like a right system for this role.
> >
> > I am running performance tests on multiple platforms: Linux and Windows.
> > For test purposes I create topics with 2 replicas and multiple
> partitions.
> > In all deployments running test producers that wait for both replicas'
> > acks practically kills Kafka throughput. For example, on the
> > following deployment on Linux machines: 2 Kafka brokers, 1 Zookeeper
> > node, 4 client hosts to create load, 4 topics with 10 partitions
> > each and 2 replicas
> >
> > - running tests with "--request-num-acks 1" produces ~3,600
> > msgs/sec
> >
> > - running tests with "--request-num-acks -1" produces ~348
> > msgs/sec
> >
> >
> > Here is output of one of the four concurrent processes:
> >
> > [User@Client2 kafka_2.8.0-0.8.0]$ bin/kafka-producer-perf-test.sh
> > --broker-list 10.0.0.8:9092,10.0.0.10:9092 --compression-codec 0
> > --message-size 1024 --request-num-acks -1 --sync --messages 100000
> > -threads
> > 10 --show-detailed-stats --reporting-interval 1000 --topics c12 |
> > grep -v "at "
> > start.time, end.time, compression, message.size, batch.size,
> > total.data.sent.in.MB, MB.sec, total.data.sent.in.nMsg, nMsg.sec
> > [2014-01-29 23:21:16,720] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,825] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,830] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,831] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,839] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,841] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,847] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,858] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,862] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:21:16,867] WARN Property reconnect.interval is not
> > valid
> > (kafka.utils.VerifiableProperties)
> > [2014-01-29 23:32:03,830] WARN Produce request with correlation id
> > 11467 failed due to [c12,2]: kafka.common.RequestTimedOutException
> > (kafka.producer.async.DefaultEventHandler)
> > [2014-01-29 23:32:03,831] WARN Produce request with correlation id
> > 11859 failed due to [c12,8]: kafka.common.RequestTimedOutException
> > (kafka.producer.async.DefaultEventHandler)
> > [2014-01-29 23:32:03,831] WARN Failed to send producer request with
> > correlation id 11819 to broker 0 with data for partitions [c12,8]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 11315 to broker 0 with data for partitions [c12,6]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 11191 to broker 0 with data for partitions [c12,4]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 11791 to broker 0 with data for partitions [c12,4]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 11395 to broker 0 with data for partitions [c12,6]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 11631 to broker 0 with data for partitions [c12,4]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 10563 to broker 0 with data for partitions [c12,0]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > [2014-01-29 23:32:03,834] WARN Failed to send producer request with
> > correlation id 10907 to broker 0 with data for partitions [c12,2]
> > (kafka.producer.async.DefaultEventHandler)
> > java.net.SocketTimeoutException
> > 2014-01-29 23:21:16:562, 2014-01-29 23:40:15:886, 0, 1024, 200,
> > 97.66, 0.0857, 100000, 87.7713
> >
> > The test result is consistent and reproducible in all deployments:
> > numbers can vary but changing acks setting consistently reduces
> > Kafka throughput
> > 4-10 times.
> >
> > Is it expected system behavior? Any tuning options to resolve the
> problem?
> >
> > Thank you,
> > Michael Popov
> >
> >
>
