Ny fandikana ny lahatsoratra dia nomanina manokana ho an'ny mpianatry ny taranja
Roa taona lasa izay no nandaniako
ClickHouse dia ahitana andalana 170 arivo amin'ny kaody C ++, ankoatry ny tranomboky an'ny antoko fahatelo, ary iray amin'ireo codebases database zaraina kely indrindra. Raha ampitahaina, ny SQLite dia tsy manohana ny fizarana ary misy andalana 235 arivo amin'ny kaody C. Amin'ity fanoratana ity, injeniera 207 no nandray anjara tamin'ny ClickHouse, ary nitombo vao haingana ny hamafin'ny fanoloran-tena.
Tamin'ny volana martsa 2017, nanomboka nitarika ny ClickHouse
Ato amin'ity lahatsoratra ity dia hijery ny fahombiazan'ny kluster ClickHouse amin'ny AWS EC2 aho amin'ny fampiasana processeur 36-core sy fitahirizana NVMe.
VAOVAO: Herinandro taorian'ny namoahana ity lahatsoratra ity tany am-boalohany, dia namerina ny andrana aho niaraka tamin'ny fanamboarana nohatsaraina ary nahazo vokatra tsara kokoa. Nohavaozina ity lahatsoratra ity mba hanehoana ireo fiovana ireo.
Manokatra Cluster AWS EC2
Hampiasa ohatra telo c5d.9xlarge EC2 aho amin'ity lahatsoratra ity. Ny tsirairay amin'izy ireo dia misy CPU virtoaly 36, 72 GB an'ny RAM, 900 GB an'ny NVMe SSD fitahirizana ary manohana tambajotra 10 Gigabit. Mitentina $1,962/ora tsirairay izy ireo any amin'ny faritra eu-west-1 rehefa mandeha amin'ny fangatahana. Hampiasa Ubuntu Server 16.04 LTS ho rafitra fiasana aho.
Ny firewall dia namboarina mba hifandraisan'ny milina tsirairay tsy misy fameperana, ary ny adiresiko IPv4 ihany no voasoratry ny SSH ao anaty cluster.
NVMe fiara amin'ny toetry ny fahavononana miasa
Ho an'ny ClickHouse miasa, dia hamorona rafitra rakitra amin'ny endrika EXT4 amin'ny fiara NVMe amin'ny server tsirairay aho.
$ sudo mkfs -t ext4 /dev/nvme1n1
$ sudo mkdir /ch
$ sudo mount /dev/nvme1n1 /ch
ΠΠΎΡΠ»Π΅ ΡΠΎΠ³ΠΎ ΠΊΠ°ΠΊ Π²ΡΠ΅ Π½Π°ΡΡΡΠΎΠ΅Π½ΠΎ, Π²Ρ ΠΌΠΎΠΆΠ΅ΡΠ΅ ΡΠ²ΠΈΠ΄Π΅ΡΡ ΡΠΎΡΠΊΡ ΠΌΠΎΠ½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ 783 ΠΠ ΠΏΡΠΎΡΡΡΠ°Π½ΡΡΠ²Π°, Π΄ΠΎΡΡΡΠΏΠ½ΠΎΠ³ΠΎ Π² ΠΊΠ°ΠΆΠ΄ΠΎΠΉ ΠΈΠ· ΡΠΈΡΡΠ΅ΠΌ.
$ lsblk
NAME 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 -h
Filesystem 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% /ch
Ny angon-drakitra hampiasaiko amin'ity fitsapana ity dia fanariam-baovao azoko avy amin'ny fiarakaretsaka 1.1 lavitrisa nalaina tao New York City nandritra ny enin-taona. Ao amin'ny bilaogy
$ sudo apt update
$ sudo apt install awscli
$ aws configure
Hapetrako ho 100 ny fetran'ny fangatahana miaraka amin'ny mpanjifa mba hisintonana rakitra haingana kokoa noho ny firafitry ny default.
$ aws configure set
default.s3.max_concurrent_requests
100
Hakaiko ao amin'ny AWS S3 ny angon-drakitra mitaingina taxi ary hitahiry izany amin'ny fiara NVMe amin'ny mpizara voalohany. Ity tahirin-kevitra ity dia ~104GB amin'ny endrika CSV compressed GZIP.
$ sudo mkdir -p /ch/csv
$ sudo chown -R ubuntu /ch/csv
$ aws s3 sync s3://<bucket>/csv /ch/csv
ClickHouse fametrahana
Hametraka ny fizarana OpenJDK ho an'ny Java 8 aho satria takiana amin'ny fampandehanana Apache ZooKeeper, izay takiana amin'ny fametrahana ClickHouse mizara amin'ny milina telo.
$ sudo apt update
$ sudo apt install
openjdk-8-jre
openjdk-8-jdk-headless
Avy eo dia nametraka ny fari-piainan'ny tontolo iainana aho JAVA_HOME
.
$ sudo vi /etc/profile
export JAVA_HOME=/usr
$ source /etc/profile
Hampiasa ny rafitra fitantanana fonosana Ubuntu aho mba hametrahana ClickHouse 18.16.1, glances ary ZooKeeper amin'ny milina telo.
$ 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
zookeeperd
Hamorona lahatahiry ho an'ny ClickHouse aho ary hanao fanovana sasany amin'ireo mpizara telo.
$ 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.conf
Ireo no fanafoanana ny config izay hampiasaiko.
<?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>
Avy eo dia hampandeha ny ZooKeeper sy ny mpizara ClickHouse amin'ny milina telo aho.
$ sudo /etc/init.d/zookeeper start
$ sudo service clickhouse-server start
Mampakatra angona ao amin'ny ClickHouse
Amin'ny mpizara voalohany dia hamorona latabatra fitsangatsanganana aho (trips
), izay hitahiry angon-drakitra momba ny dia taxi mampiasa ny motera 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;
Avy eo aho dia maka sy mampiditra ny rakitra CSV tsirairay ao anaty latabatra fitetezana (trips
). Vita tao anatin'ny 55 minitra sy 10 segondra izao manaraka izao. Taorian'io fandidiana io, ny haben'ny lahatahiry data dia 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)
Ny hafainganam-pandehan'ny fanafarana dia 155 MB amin'ny atiny CSV tsy voapotsitra isan-tsegondra. Miahiahy aho fa noho ny fikorontanan'ny GZIP decompression izany. Mety ho haingana kokoa ny namoahana ny rakitra gzip rehetra mifanitsy amin'ny fampiasana xargs ary avy eo mametaka ny angon-drakitra voavaha. Ity ambany ity ny famaritana ny zavatra notaterina nandritra ny dingana fanafarana CSV.
$ sudo glances
ip-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/23:1H
Hanafaka toerana amin'ny fiara NVMe aho amin'ny famafana ny rakitra CSV tany am-boalohany alohan'ny hanohizana.
$ sudo rm -fr /ch/csv
Hiverina any amin'ny tsanganana
Ny motera Log ClickHouse dia hitahiry angona amin'ny endrika miompana amin'ny laharana. Mba hanontaniana haingana kokoa ny angona dia mamadika azy ho endrika tsanganana aho amin'ny fampiasana ny motera MergeTree.
$ clickhouse-client --host=0.0.0.0
Vita tao anatin'ny 34 minitra sy 50 segondra izao manaraka izao. Taorian'io fandidiana io, ny haben'ny lahatahiry data dia 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;
Toy izao ny fijery nivoaka nandritra ny fandidiana:
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)
Tamin'ny fitsapana farany, tsanganana maromaro no niova fo sy naverina kajy. Hitako fa ny sasany amin'ireo fiasa ireo dia tsy mandeha araka ny nantenaina amin'ity angona ity. Mba hamahana ity olana ity dia nesoriko ireo fiasa tsy mety ary nampidiriko ny angona nefa tsy niova ho karazana granular kokoa.
Fizarana angona manerana ny cluster
Hizara ny angona amin'ireo node cluster telo aho. Hanombohana, eto ambany aho dia hamorona latabatra amin'ny milina telo.
$ clickhouse-client --host=0.0.0.0
CREATE 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);
Avy eo dia ho azoko antoka fa ny mpizara voalohany dia afaka mahita ny node telo ao amin'ny cluster.
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:
Avy eo aho dia hamaritra latabatra vaovao amin'ny lohamilina voalohany mifototra amin'ny skema trips_mergetree_third
ary mampiasa ny motera Distributed.
CREATE TABLE trips_mergetree_x3
AS trips_mergetree_third
ENGINE = Distributed(perftest_3shards,
default,
trips_mergetree_third,
rand());
Avy eo aho dia handika ny angona avy amin'ny latabatra miorina amin'ny MergeTree mankany amin'ireo mpizara telo. Vita tao anatin'ny 34 minitra sy 44 segondra izao manaraka izao.
INSERT INTO trips_mergetree_x3
SELECT * FROM trips_mergetree;
Taorian'ny fandidiana etsy ambony, dia nanome ClickHouse 15 minitra aho mba hialana amin'ny mari-pamantarana ambony indrindra. Ny lahatahiry data dia niafara tamin'ny 264 GB, 34 GB ary 33 GB tsirairay avy amin'ireo mpizara telo.
ClickHouse cluster performance fanombanana
Ny zavatra hitako manaraka dia ny fotoana haingana indrindra hitako nandrotsahana fanontaniana tsirairay teo ambony latabatra imbetsaka trips_mergetree_x3
.
$ clickhouse-client --host=0.0.0.0
Ity manaraka ity dia vita tao anatin'ny 2.449 segondra.
SELECT cab_type, count(*)
FROM trips_mergetree_x3
GROUP BY cab_type;
Ity manaraka ity dia vita tao anatin'ny 0.691 segondra.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree_x3
GROUP BY passenger_count;
Ity manaraka ity dia vita tao anatin'ny 0 segondra.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree_x3
GROUP BY passenger_count,
year;
Ity manaraka ity dia vita tao anatin'ny 0.983 segondra.
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;
ΠΠ»Ρ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Π²ΡΠΏΠΎΠ»Π½ΠΈΠ» ΡΠ΅ ΠΆΠ΅ Π·Π°ΠΏΡΠΎΡΡ Π² ΡΠ°Π±Π»ΠΈΡΠ΅ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ MergeTree, ΠΊΠΎΡΠΎΡΠ°Ρ Π½Π°Ρ ΠΎΠ΄ΠΈΡΡΡ ΠΈΡΠΊΠ»ΡΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π½Π° ΠΏΠ΅ΡΠ²ΠΎΠΌ ΡΠ΅ΡΠ²Π΅ΡΠ΅.
Fanombanana ny fahombiazan'ny node ClickHouse iray
Ny zavatra hitako manaraka dia ny fotoana haingana indrindra hitako nandrotsahana fanontaniana tsirairay teo ambony latabatra imbetsaka trips_mergetree_x3
.
Ity manaraka ity dia vita tao anatin'ny 0.241 segondra.
SELECT cab_type, count(*)
FROM trips_mergetree
GROUP BY cab_type;
Ity manaraka ity dia vita tao anatin'ny 0.826 segondra.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree
GROUP BY passenger_count;
Ity manaraka ity dia vita tao anatin'ny 1.209 segondra.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree
GROUP BY passenger_count,
year;
Ity manaraka ity dia vita tao anatin'ny 1.781 segondra.
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;
Fandinihana ny vokatra
Ity no fotoana voalohany nahafahan'ny angon-drakitra miorina amin'ny CPU maimaim-poana afaka nihoatra ny angon-drakitra mifototra amin'ny GPU tamin'ny fitsapana nataoko. Ny angon-drakitra mifototra amin'ny GPU dia nandalo fanavaozana roa nanomboka teo, fa ny fampisehoana nataon'i ClickHouse tamin'ny node tokana dia tena mahavariana.
Mandritra izany fotoana izany, rehefa manatanteraka ny Query 1 amin'ny motera zaraina, ny vidin'ny overhead dia filaharana ambony kokoa. Manantena aho fa misy zavatra tsy azoko tamin'ny fikarohana nataoko tamin'ity lahatsoratra ity satria mahafinaritra ny mahita ny fotoana fangataham-panontaniana midina rehefa manampy nodes bebe kokoa amin'ny cluster aho. Na izany aza, mahafinaritra fa rehefa manatanteraka fanontaniana hafa dia nitombo avo roa heny ny fahombiazany.
Mahafinaritra ny mahita ny ClickHouse mivoatra mankany amin'ny fahafahana manasaraka ny fitahirizana sy ny kajy mba hahafahan'izy ireo mizana tsy miankina. Ny fanohanana HDFS, izay nampiana tamin'ny taon-dasa, dia mety ho dingana mankany amin'izany. Eo amin'ny resaka informatika, raha azo atao haingana ny fangatahana tokana amin'ny fampitomboana nodes bebe kokoa amin'ny cluster, dia tena mamirapiratra ny hoavin'ity rindrambaiko ity.
Misaotra anao naka fotoana namaky ity lahatsoratra ity. Manolotra serivisy consulting, maritrano ary fampivoarana fanao ho an'ny mpanjifa any Amerika Avaratra sy Eropa aho. Raha te hiresaka momba ny fomba ahafahan'ny soso-kevitro manampy ny orinasanao ianao dia mifandraisa amiko amin'ny alΓ lan'ny
Source: www.habr.com