Kumasulira kwa nkhaniyi kunakonzedwa makamaka kwa ophunzira a maphunzirowo .
ndi open source columnar database. Ndi malo abwino komwe akatswiri ambiri amatha kufunsa zambiri zatsatanetsatane, ngakhale makumi mabiliyoni a mbiri yatsopano amalowetsedwa patsiku. Ndalama zoyendetsera dongosololi zitha kukhala zokwera mpaka $100 pachaka, ndipo mwina theka lazomwezo kutengera kugwiritsidwa ntchito. Panthawi ina, kuyika kwa ClickHouse kuchokera ku Yandex Metrics kunali ndi zolemba 10 thililiyoni. Kuphatikiza pa Yandex, ClickHouse yapezanso bwino ndi Bloomberg ndi Cloudflare.
Zaka ziwiri zapitazo ndinakhala nkhokwe pogwiritsa ntchito makina amodzi, ndipo zidakhala pulogalamu yaulere ya database yomwe ndidawawonapo. Kuyambira pamenepo, Madivelopa sanasiye kuwonjezera zinthu, kuphatikizapo kuthandizira Kafka, HDFS ndi ZStandard compression. Chaka chatha iwo anawonjezera thandizo cascading njira psinjika, ndi kukodzedwa kunatheka. Mukakanikiza data yanthawi, ma geji amatha kupanikizidwa bwino pogwiritsa ntchito encoding ya delta, koma pazowerengera zingakhale bwino kugwiritsa ntchito encoding ya delta-by-delta. Kuponderezana kwabwino kwakhala chinsinsi chakuchita kwa ClickHouse.
ClickHouse ili ndi mizere 170 ya C ++ code, kupatula malaibulale a gulu lachitatu, ndipo ndi imodzi mwama codebases ang'onoang'ono omwe amagawidwa. Poyerekeza, SQLite sichigwirizana ndi kugawa ndipo ili ndi mizere ya 235 zikwi za C code. Monga mukulemba uku, akatswiri a 207 athandizira ku ClickHouse, ndipo kuwonjezereka kwa mabizinesi akuwonjezeka posachedwapa.
Mu Marichi 2017, ClickHouse idayamba kuchita ngati njira yosavuta yowonera chitukuko. Adaphwanyanso fayilo ya zolemba za monolithic kukhala fayilo yochokera ku Markdown. Nkhani ndi mawonekedwe amatsatiridwa kudzera pa GitHub, ndipo mwachizoloΕ΅ezi pulogalamuyi yakhala ikupezeka kwambiri pazaka zingapo zapitazi.
M'nkhaniyi, ndiyang'ana momwe gulu la ClickHouse limagwirira ntchito pa AWS EC2 pogwiritsa ntchito 36-core processors ndi NVMe yosungirako.
ZOCHITIKA: Patangotha ββββsabata nditasindikiza izi, ndidayambiranso kuyesako ndikuwongolera bwino ndipo ndidapeza zotsatira zabwino kwambiri. Nkhaniyi yasinthidwa kuti iwonetse zosinthazi.
Kukhazikitsa AWS EC2 Cluster
Ndikhala ndikugwiritsa ntchito ma c5d.9xlarge EC2 atatu pa positiyi. Iliyonse yaiwo ili ndi ma CPU pafupifupi 36, 72 GB ya RAM, 900 GB ya NVMe SSD yosungirako ndipo imathandizira 10 Gigabit network. Amawononga $ 1,962 / ola lililonse m'chigawo cha eu-west-1 akamafunikira. Ndikhala ndikugwiritsa ntchito Ubuntu Server 16.04 LTS ngati makina ogwiritsira ntchito.
Chowotcha motocho chimakonzedwa kuti makina aliwonse azilumikizana popanda zoletsa, ndipo adilesi yanga ya IPv4 yokha ndiyomwe imasankhidwa ndi SSH mgululi.
NVMe drive mu mkhalidwe wokonzeka kugwira ntchito
Kuti ClickHouse igwire ntchito, ndipanga fayilo mumtundu wa EXT4 pagalimoto ya NVMe pa seva iliyonse.
$ sudo mkfs -t ext4 /dev/nvme1n1
$ sudo mkdir /ch
$ sudo mount /dev/nvme1n1 /chChilichonse chikakonzedwa, mutha kuwona malo okwera ndi 783 GB ya malo omwe amapezeka padongosolo lililonse.
$ lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 87.9M 1 loop /snap/core/5742
loop1 7:1 0 16.5M 1 loop /snap/amazon-ssm-agent/784
nvme0n1 259:1 0 8G 0 disk
ββnvme0n1p1 259:2 0 8G 0 part /
nvme1n1 259:0 0 838.2G 0 disk /ch$ df -hFilesystem Size Used Avail Use% Mounted on
udev 35G 0 35G 0% /dev
tmpfs 6.9G 8.8M 6.9G 1% /run
/dev/nvme0n1p1 7.7G 967M 6.8G 13% /
tmpfs 35G 0 35G 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 35G 0 35G 0% /sys/fs/cgroup
/dev/loop0 88M 88M 0 100% /snap/core/5742
/dev/loop1 17M 17M 0 100% /snap/amazon-ssm-agent/784
tmpfs 6.9G 0 6.9G 0% /run/user/1000
/dev/nvme1n1 825G 73M 783G 1% /chDongosolo lomwe ndigwiritse ntchito pamayesowa ndidayira lomwe ndidapanga kuchokera pamakwerero mabiliyoni 1.1 omwe adatengedwa ku New York City pazaka zisanu ndi chimodzi. Pa blog mwatsatanetsatane momwe ndinasonkhanitsira deta iyi. Amasungidwa mu AWS S3, kotero ndikonza AWS CLI ndi mwayi wanga ndi makiyi achinsinsi.
$ sudo apt update
$ sudo apt install awscli
$ aws configureNdiyika malire anthawi yomweyo a kasitomala ku 100 kuti mafayilo atsitsidwe mwachangu kuposa zosintha zosasintha.
$ aws configure set
default.s3.max_concurrent_requests
100Nditsitsa mayendedwe a taxi kuchokera ku AWS S3 ndikusunga pagalimoto ya NVMe pa seva yoyamba. Izi ndi ~104GB mumtundu wa CSV woponderezedwa wa GZIP.
$ sudo mkdir -p /ch/csv
$ sudo chown -R ubuntu /ch/csv
$ aws s3 sync s3://<bucket>/csv /ch/csvKukhazikitsa kwa ClickHouse
Ndikhazikitsa kugawa kwa OpenJDK kwa Java 8 monga kumafunika kuyendetsa Apache ZooKeeper, yomwe imafunika kuti pakhale kugawa kwa ClickHouse pamakina onse atatu.
$ sudo apt update
$ sudo apt install
openjdk-8-jre
openjdk-8-jdk-headless
Kenako ndinayika kusintha kwa chilengedwe JAVA_HOME.
$ sudo vi /etc/profile
export JAVA_HOME=/usr
$ source /etc/profileKenako ndidzagwiritsa ntchito kasamalidwe ka phukusi la Ubuntu kukhazikitsa ClickHouse 18.16.1, kuyang'ana ndi ZooKeeper pamakina onse atatu.
$ sudo apt-key adv
--keyserver hkp://keyserver.ubuntu.com:80
--recv E0C56BD4
$ echo "deb http://repo.yandex.ru/clickhouse/deb/stable/ main/" |
sudo tee /etc/apt/sources.list.d/clickhouse.list
$ sudo apt-get update$ sudo apt install
clickhouse-client
clickhouse-server
glances
zookeeperdNdipanga chikwatu cha ClickHouse ndikuchitanso zosintha zina pa maseva onse atatu.
$ sudo mkdir /ch/clickhouse
$ sudo chown -R clickhouse /ch/clickhouse
$ sudo mkdir -p /etc/clickhouse-server/conf.d
$ sudo vi /etc/clickhouse-server/conf.d/taxis.confIzi ndizowonjezera zosintha zomwe ndizigwiritsa ntchito.
<?xml version="1.0"?>
<yandex>
<listen_host>0.0.0.0</listen_host>
<path>/ch/clickhouse/</path>
<remote_servers>
<perftest_3shards>
<shard>
<replica>
<host>172.30.2.192</host>
<port>9000</port>
</replica>
</shard>
<shard>
<replica>
<host>172.30.2.162</host>
<port>9000</port>
</replica>
</shard>
<shard>
<replica>
<host>172.30.2.36</host>
<port>9000</port>
</replica>
</shard>
</perftest_3shards>
</remote_servers> <zookeeper-servers>
<node>
<host>172.30.2.192</host>
<port>2181</port>
</node>
<node>
<host>172.30.2.162</host>
<port>2181</port>
</node>
<node>
<host>172.30.2.36</host>
<port>2181</port>
</node>
</zookeeper-servers> <macros>
<shard>03</shard>
<replica>01</replica>
</macros>
</yandex>Kenako ndidzayendetsa ZooKeeper ndi seva ya ClickHouse pamakina onse atatu.
$ sudo /etc/init.d/zookeeper start
$ sudo service clickhouse-server startKukweza deta ku ClickHouse
Pa seva yoyamba ndipanga tebulo laulendo (trips), yomwe idzasunga deta ya maulendo a taxi pogwiritsa ntchito injini ya Log.
$ clickhouse-client --host=0.0.0.0
CREATE TABLE trips (
trip_id UInt32,
vendor_id String,
pickup_datetime DateTime,
dropoff_datetime Nullable(DateTime),
store_and_fwd_flag Nullable(FixedString(1)),
rate_code_id Nullable(UInt8),
pickup_longitude Nullable(Float64),
pickup_latitude Nullable(Float64),
dropoff_longitude Nullable(Float64),
dropoff_latitude Nullable(Float64),
passenger_count Nullable(UInt8),
trip_distance Nullable(Float64),
fare_amount Nullable(Float32),
extra Nullable(Float32),
mta_tax Nullable(Float32),
tip_amount Nullable(Float32),
tolls_amount Nullable(Float32),
ehail_fee Nullable(Float32),
improvement_surcharge Nullable(Float32),
total_amount Nullable(Float32),
payment_type Nullable(String),
trip_type Nullable(UInt8),
pickup Nullable(String),
dropoff Nullable(String),
cab_type Nullable(String),
precipitation Nullable(Int8),
snow_depth Nullable(Int8),
snowfall Nullable(Int8),
max_temperature Nullable(Int8),
min_temperature Nullable(Int8),
average_wind_speed Nullable(Int8),
pickup_nyct2010_gid Nullable(Int8),
pickup_ctlabel Nullable(String),
pickup_borocode Nullable(Int8),
pickup_boroname Nullable(String),
pickup_ct2010 Nullable(String),
pickup_boroct2010 Nullable(String),
pickup_cdeligibil Nullable(FixedString(1)),
pickup_ntacode Nullable(String),
pickup_ntaname Nullable(String),
pickup_puma Nullable(String),
dropoff_nyct2010_gid Nullable(UInt8),
dropoff_ctlabel Nullable(String),
dropoff_borocode Nullable(UInt8),
dropoff_boroname Nullable(String),
dropoff_ct2010 Nullable(String),
dropoff_boroct2010 Nullable(String),
dropoff_cdeligibil Nullable(String),
dropoff_ntacode Nullable(String),
dropoff_ntaname Nullable(String),
dropoff_puma Nullable(String)
) ENGINE = Log;
Kenako ndimachotsa ndikuyika mafayilo onse a CSV patebulo laulendo (trips). Zotsatirazi zidamalizidwa mu mphindi 55 ndi masekondi 10. Pambuyo pa ntchitoyi, kukula kwa chikwatu cha data kunali 134 GB.
$ time (for FILENAME in /ch/csv/trips_x*.csv.gz; do
echo $FILENAME
gunzip -c $FILENAME |
clickhouse-client
--host=0.0.0.0
--query="INSERT INTO trips FORMAT CSV"
done)Liwiro lolowetsamo linali 155 MB ya CSV yosakanizidwa pamphindikati. Ndikuganiza kuti izi zidachitika chifukwa cha kuchepa kwa GZIP. Zikadakhala zachangu kumasula mafayilo onse a gzipped mofananira pogwiritsa ntchito xargs ndikutsitsa zomwe sizinasungidwe. Pansipa pali kufotokozera zomwe zidanenedwa panthawi ya CSV yolowetsa.
$ sudo glancesip-172-30-2-200 (Ubuntu 16.04 64bit / Linux 4.4.0-1072-aws) Uptime: 0:11:42
CPU 8.2% nice: 0.0% LOAD 36-core MEM 9.8% active: 5.20G SWAP 0.0%
user: 6.0% irq: 0.0% 1 min: 2.24 total: 68.7G inactive: 61.0G total: 0
system: 0.9% iowait: 1.3% 5 min: 1.83 used: 6.71G buffers: 66.4M used: 0
idle: 91.8% steal: 0.0% 15 min: 1.01 free: 62.0G cached: 61.6G free: 0
NETWORK Rx/s Tx/s TASKS 370 (507 thr), 2 run, 368 slp, 0 oth sorted automatically by cpu_percent, flat view
ens5 136b 2Kb
lo 343Mb 343Mb CPU% MEM% VIRT RES PID USER NI S TIME+ IOR/s IOW/s Command
100.4 1.5 1.65G 1.06G 9909 ubuntu 0 S 1:01.33 0 0 clickhouse-client --host=0.0.0.0 --query=INSERT INTO trips FORMAT CSV
DISK I/O R/s W/s 85.1 0.0 4.65M 708K 9908 ubuntu 0 R 0:50.60 32M 0 gzip -d -c /ch/csv/trips_xac.csv.gz
loop0 0 0 54.9 5.1 8.14G 3.49G 8091 clickhous 0 S 1:44.23 0 45M /usr/bin/clickhouse-server --config=/etc/clickhouse-server/config.xml
loop1 0 0 4.5 0.0 0 0 319 root 0 S 0:07.50 1K 0 kworker/u72:2
nvme0n1 0 3K 2.3 0.0 91.1M 28.9M 9912 root 0 R 0:01.56 0 0 /usr/bin/python3 /usr/bin/glances
nvme0n1p1 0 3K 0.3 0.0 0 0 960 root -20 S 0:00.10 0 0 kworker/28:1H
nvme1n1 32.1M 495M 0.3 0.0 0 0 1058 root -20 S 0:00.90 0 0 kworker/23:1HNdimasula malo pagalimoto ya NVMe pochotsa mafayilo a CSV oyambirira ndisanapitirize.
$ sudo rm -fr /ch/csvSinthani kukhala Fomu ya Mzere
Injini ya Log ClickHouse idzasunga deta mumzere wokhazikika. Kuti ndifunse zambiri mwachangu, ndimasintha kukhala mtundu wa columnar pogwiritsa ntchito injini ya MergeTree.
$ clickhouse-client --host=0.0.0.0Zotsatirazi zidamalizidwa mu mphindi 34 ndi masekondi 50. Pambuyo pa opaleshoniyi, kukula kwa chikwatu cha data kunali 237 GB.
CREATE TABLE trips_mergetree
ENGINE = MergeTree(pickup_date, pickup_datetime, 8192)
AS SELECT
trip_id,
CAST(vendor_id AS Enum8('1' = 1,
'2' = 2,
'CMT' = 3,
'VTS' = 4,
'DDS' = 5,
'B02512' = 10,
'B02598' = 11,
'B02617' = 12,
'B02682' = 13,
'B02764' = 14)) AS vendor_id,
toDate(pickup_datetime) AS pickup_date,
ifNull(pickup_datetime, toDateTime(0)) AS pickup_datetime,
toDate(dropoff_datetime) AS dropoff_date,
ifNull(dropoff_datetime, toDateTime(0)) AS dropoff_datetime,
assumeNotNull(store_and_fwd_flag) AS store_and_fwd_flag,
assumeNotNull(rate_code_id) AS rate_code_id,
assumeNotNull(pickup_longitude) AS pickup_longitude,
assumeNotNull(pickup_latitude) AS pickup_latitude,
assumeNotNull(dropoff_longitude) AS dropoff_longitude,
assumeNotNull(dropoff_latitude) AS dropoff_latitude,
assumeNotNull(passenger_count) AS passenger_count,
assumeNotNull(trip_distance) AS trip_distance,
assumeNotNull(fare_amount) AS fare_amount,
assumeNotNull(extra) AS extra,
assumeNotNull(mta_tax) AS mta_tax,
assumeNotNull(tip_amount) AS tip_amount,
assumeNotNull(tolls_amount) AS tolls_amount,
assumeNotNull(ehail_fee) AS ehail_fee,
assumeNotNull(improvement_surcharge) AS improvement_surcharge,
assumeNotNull(total_amount) AS total_amount,
assumeNotNull(payment_type) AS payment_type_,
assumeNotNull(trip_type) AS trip_type,
pickup AS pickup,
pickup AS dropoff,
CAST(assumeNotNull(cab_type)
AS Enum8('yellow' = 1, 'green' = 2))
AS cab_type,
precipitation AS precipitation,
snow_depth AS snow_depth,
snowfall AS snowfall,
max_temperature AS max_temperature,
min_temperature AS min_temperature,
average_wind_speed AS average_wind_speed,
pickup_nyct2010_gid AS pickup_nyct2010_gid,
pickup_ctlabel AS pickup_ctlabel,
pickup_borocode AS pickup_borocode,
pickup_boroname AS pickup_boroname,
pickup_ct2010 AS pickup_ct2010,
pickup_boroct2010 AS pickup_boroct2010,
pickup_cdeligibil AS pickup_cdeligibil,
pickup_ntacode AS pickup_ntacode,
pickup_ntaname AS pickup_ntaname,
pickup_puma AS pickup_puma,
dropoff_nyct2010_gid AS dropoff_nyct2010_gid,
dropoff_ctlabel AS dropoff_ctlabel,
dropoff_borocode AS dropoff_borocode,
dropoff_boroname AS dropoff_boroname,
dropoff_ct2010 AS dropoff_ct2010,
dropoff_boroct2010 AS dropoff_boroct2010,
dropoff_cdeligibil AS dropoff_cdeligibil,
dropoff_ntacode AS dropoff_ntacode,
dropoff_ntaname AS dropoff_ntaname,
dropoff_puma AS dropoff_puma
FROM trips;Izi ndi momwe mawonekedwe owonera amawonekera panthawi yogwira ntchito:
ip-172-30-2-200 (Ubuntu 16.04 64bit / Linux 4.4.0-1072-aws) Uptime: 1:06:09
CPU 10.3% nice: 0.0% LOAD 36-core MEM 16.1% active: 13.3G SWAP 0.0%
user: 7.9% irq: 0.0% 1 min: 1.87 total: 68.7G inactive: 52.8G total: 0
system: 1.6% iowait: 0.8% 5 min: 1.76 used: 11.1G buffers: 71.8M used: 0
idle: 89.7% steal: 0.0% 15 min: 1.95 free: 57.6G cached: 57.2G free: 0
NETWORK Rx/s Tx/s TASKS 367 (523 thr), 1 run, 366 slp, 0 oth sorted automatically by cpu_percent, flat view
ens5 1Kb 8Kb
lo 2Kb 2Kb CPU% MEM% VIRT RES PID USER NI S TIME+ IOR/s IOW/s Command
241.9 12.8 20.7G 8.78G 8091 clickhous 0 S 30:36.73 34M 125M /usr/bin/clickhouse-server --config=/etc/clickhouse-server/config.xml
DISK I/O R/s W/s 2.6 0.0 90.4M 28.3M 9948 root 0 R 1:18.53 0 0 /usr/bin/python3 /usr/bin/glances
loop0 0 0 1.3 0.0 0 0 203 root 0 S 0:09.82 0 0 kswapd0
loop1 0 0 0.3 0.1 315M 61.3M 15701 ubuntu 0 S 0:00.40 0 0 clickhouse-client --host=0.0.0.0
nvme0n1 0 3K 0.3 0.0 0 0 7 root 0 S 0:00.83 0 0 rcu_sched
nvme0n1p1 0 3K 0.0 0.0 0 0 142 root 0 S 0:00.22 0 0 migration/27
nvme1n1 25.8M 330M 0.0 0.0 59.7M 1.79M 2764 ubuntu 0 S 0:00.00 0 0 (sd-pam)M'mayeso omaliza, mizati ingapo idasinthidwa ndikuwerengedwanso. Ndapeza kuti zina mwazinthuzi sizikugwiranso ntchito monga momwe zimayembekezeredwa pagululi. Kuti ndithetse vutoli, ndinachotsa ntchito zosayenera ndikunyamula deta popanda kusinthira ku mitundu yambiri ya granular.
Kugawidwa kwa data pamagulu onse
Ndigawa deta pamagulu onse atatu amagulu. Kuyamba, pansipa ndipanga tebulo pamakina onse atatu.
$ clickhouse-client --host=0.0.0.0CREATE TABLE trips_mergetree_third (
trip_id UInt32,
vendor_id String,
pickup_date Date,
pickup_datetime DateTime,
dropoff_date Date,
dropoff_datetime Nullable(DateTime),
store_and_fwd_flag Nullable(FixedString(1)),
rate_code_id Nullable(UInt8),
pickup_longitude Nullable(Float64),
pickup_latitude Nullable(Float64),
dropoff_longitude Nullable(Float64),
dropoff_latitude Nullable(Float64),
passenger_count Nullable(UInt8),
trip_distance Nullable(Float64),
fare_amount Nullable(Float32),
extra Nullable(Float32),
mta_tax Nullable(Float32),
tip_amount Nullable(Float32),
tolls_amount Nullable(Float32),
ehail_fee Nullable(Float32),
improvement_surcharge Nullable(Float32),
total_amount Nullable(Float32),
payment_type Nullable(String),
trip_type Nullable(UInt8),
pickup Nullable(String),
dropoff Nullable(String),
cab_type Nullable(String),
precipitation Nullable(Int8),
snow_depth Nullable(Int8),
snowfall Nullable(Int8),
max_temperature Nullable(Int8),
min_temperature Nullable(Int8),
average_wind_speed Nullable(Int8),
pickup_nyct2010_gid Nullable(Int8),
pickup_ctlabel Nullable(String),
pickup_borocode Nullable(Int8),
pickup_boroname Nullable(String),
pickup_ct2010 Nullable(String),
pickup_boroct2010 Nullable(String),
pickup_cdeligibil Nullable(FixedString(1)),
pickup_ntacode Nullable(String),
pickup_ntaname Nullable(String),
pickup_puma Nullable(String),
dropoff_nyct2010_gid Nullable(UInt8),
dropoff_ctlabel Nullable(String),
dropoff_borocode Nullable(UInt8),
dropoff_boroname Nullable(String),
dropoff_ct2010 Nullable(String),
dropoff_boroct2010 Nullable(String),
dropoff_cdeligibil Nullable(String),
dropoff_ntacode Nullable(String),
dropoff_ntaname Nullable(String),
dropoff_puma Nullable(String)
) ENGINE = MergeTree(pickup_date, pickup_datetime, 8192);Kenako ndiwonetsetsa kuti seva yoyamba imatha kuwona ma node onse atatu pagulu.
SELECT *
FROM system.clusters
WHERE cluster = 'perftest_3shards'
FORMAT Vertical;Row 1:
ββββββ
cluster: perftest_3shards
shard_num: 1
shard_weight: 1
replica_num: 1
host_name: 172.30.2.192
host_address: 172.30.2.192
port: 9000
is_local: 1
user: default
default_database:Row 2:
ββββββ
cluster: perftest_3shards
shard_num: 2
shard_weight: 1
replica_num: 1
host_name: 172.30.2.162
host_address: 172.30.2.162
port: 9000
is_local: 0
user: default
default_database:Row 3:
ββββββ
cluster: perftest_3shards
shard_num: 3
shard_weight: 1
replica_num: 1
host_name: 172.30.2.36
host_address: 172.30.2.36
port: 9000
is_local: 0
user: default
default_database:
Kenako ndifotokozera tebulo latsopano pa seva yoyamba yomwe imachokera pa schema trips_mergetree_third ndikugwiritsa ntchito injini Yogawa.
CREATE TABLE trips_mergetree_x3
AS trips_mergetree_third
ENGINE = Distributed(perftest_3shards,
default,
trips_mergetree_third,
rand());Kenako ndikopera zambiri kuchokera pa tebulo la MergeTree kupita ku maseva onse atatu. Zotsatirazi zidamalizidwa mu mphindi 34 ndi masekondi 44.
INSERT INTO trips_mergetree_x3
SELECT * FROM trips_mergetree;Pambuyo pa opaleshoni yomwe ili pamwambapa, ndidapatsa ClickHouse mphindi 15 kuti ichoke pachimake chosungirako. Zolemba za data zidatha kukhala 264 GB, 34 GB ndi 33 GB motsatana pa seva iliyonse itatu.
Kuwunika kwa magwiridwe antchito a ClickHouse
Zomwe ndidawona pambuyo pake inali nthawi yachangu kwambiri yomwe ndawonapo ikufunsa funso lililonse patebulo kangapo trips_mergetree_x3.
$ clickhouse-client --host=0.0.0.0Zotsatirazi zidatha mumasekondi a 2.449.
SELECT cab_type, count(*)
FROM trips_mergetree_x3
GROUP BY cab_type;Zotsatirazi zidatha mumasekondi a 0.691.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree_x3
GROUP BY passenger_count;Zotsatirazi zidatha mumasekondi a 0.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree_x3
GROUP BY passenger_count,
year;Zotsatirazi zidatha mumasekondi a 0.983.
SELECT passenger_count,
toYear(pickup_date) AS year,
round(trip_distance) AS distance,
count(*)
FROM trips_mergetree_x3
GROUP BY passenger_count,
year,
distance
ORDER BY year,
count(*) DESC;Poyerekeza, ndinayendetsa mafunso omwewo pa tebulo la MergeTree lomwe limakhala pa seva yoyamba.
Kuwunika magwiridwe antchito a node imodzi ya ClickHouse
Zomwe ndidawona pambuyo pake inali nthawi yachangu kwambiri yomwe ndawonapo ikufunsa funso lililonse patebulo kangapo trips_mergetree_x3.
Zotsatirazi zidatha mumasekondi a 0.241.
SELECT cab_type, count(*)
FROM trips_mergetree
GROUP BY cab_type;Zotsatirazi zidatha mumasekondi a 0.826.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree
GROUP BY passenger_count;Zotsatirazi zidatha mumasekondi a 1.209.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree
GROUP BY passenger_count,
year;Zotsatirazi zidatha mumasekondi a 1.781.
SELECT passenger_count,
toYear(pickup_date) AS year,
round(trip_distance) AS distance,
count(*)
FROM trips_mergetree
GROUP BY passenger_count,
year,
distance
ORDER BY year,
count(*) DESC;Kulingalira pa zotsatira
Aka ndi koyamba kuti database yaulere yochokera ku CPU idakwanitsa kupitilira database ya GPU pamayesero anga. Nawonso database yochokera ku GPU yadutsa zosintha ziwiri kuyambira pamenepo, koma magwiridwe antchito omwe ClickHouse adapereka pa node imodzi ndiosangalatsa kwambiri.
Nthawi yomweyo, pochita Query 1 pa injini yogawidwa, ndalama zolipirira ndizokwera kwambiri. Ndikukhulupirira kuti ndaphonyapo china chake pakufufuza kwanga pa positiyi chifukwa zingakhale zabwino kuwona nthawi zamafunso zikutsika ndikuwonjezera ma node ena pagulu. Komabe, ndizabwino kuti pofunsa mafunso ena, magwiridwe antchito amawonjezeka pafupifupi 2 nthawi.
Zingakhale zabwino kuwona ClickHouse ikusintha kuti athe kusiyanitsa zosungirako ndikuwerengera kuti athe kudziyimira pawokha. Thandizo la HDFS, lomwe linawonjezeredwa chaka chatha, likhoza kukhala sitepe yopita ku izi. Pankhani ya computing, ngati funso limodzi likhoza kufulumizitsidwa powonjezera ma node ambiri kumagulu, ndiye kuti tsogolo la pulogalamuyi ndi lowala kwambiri.
Zikomo chifukwa chopatula nthawi yowerenga izi. Ndimapereka upangiri, zomangamanga, ndi ntchito zachitukuko kwa makasitomala aku North America ndi Europe. Ngati mukufuna kukambirana momwe malingaliro anga angathandizire bizinesi yanu, chonde nditumizireni kudzera .
Source: www.habr.com