Ko te whakamaoritanga o te tuhinga i whakaritea mo nga akonga o te akoranga
E rua tau ki muri i noho ahau
Ko te ClickHouse he 170 mano nga rarangi o te waehere C ++, haunga nga whare pukapuka tuatoru, a ko tetahi o nga waahi iti rawa atu kua tohatohahia. Hei whakataurite, kaore a SQLite e tautoko i te tohatoha me te 235 mano nga rarangi o te waehere C. I tenei wa i tuhia ai, 207 nga miihini kua uru atu ki a ClickHouse, a, kua piki ake te kaha o nga mahi.
I te Maehe 2017, ka timata a ClickHouse ki te whakahaere
I roto i tenei tuhinga, ka titiro ahau ki nga mahi a te roopu ClickHouse i runga i te AWS EC2 ma te whakamahi i nga tukatuka 36-matua me te rokiroki NVMe.
WHAKAMAHI: He wiki i muri i te whakaputa tuatahi i tenei panui, ka huri ano ahau i te whakamatautau me te pai ake o te whirihoranga me te pai ake o nga hua. Kua whakahouhia tenei panui ki te whakaatu i enei huringa.
Te whakarewa i te AWS EC2 Cluster
Ka whakamahi ahau i nga tauira c5d.9xlarge EC2 e toru mo tenei pou. Kei ia o ratou 36 CPU mariko, 72 GB o RAM, 900 GB o NVMe SSD rokiroki me te tautoko 10 Gigabit whatunga. Utu ratou $1,962/haora ia i roto i te rohe eu-uru-1 ka rere i runga i tono. Ka whakamahi ahau i te Ubuntu Server 16.04 LTS hei punaha whakahaere.
Kua whirihorahia te papangaahi kia taea ai e ia miihini te whakawhitiwhiti korero ki a raatau ano me te kore he here, a ko taku wahitau IPv4 anake ka whakarangihia e SSH i roto i te roopu.
NVMe puku i roto i te ahua rerihari mahi
Mo te mahi a ClickHouse, ka hangaia e ahau he punaha konae ki te whakatakotoranga EXT4 i runga i te puku NVMe i runga i ia o nga kaitoro.
$ sudo mkfs -t ext4 /dev/nvme1n1
$ sudo mkdir /ch
$ sudo mount /dev/nvme1n1 /ch
Kia whirihorahia nga mea katoa, ka kite koe i te waahi maunga me te 783 GB o te waahi kei runga i ia punaha.
$ 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
└─nvme0n1p1 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
Ko te huingararaunga ka whakamahia e ahau i tenei whakamatautau he putunga raraunga i mahia e au mai i te 1.1 piriona ekenga taxi i utaina ki New York City mo te ono tau. I runga i te rangitaki
$ sudo apt update
$ sudo apt install awscli
$ aws configure
Ka whakatauhia e ahau te rohe tono a te kiritaki ki te 100 kia tere ake te tango i nga konae i nga tautuhinga taunoa.
$ aws configure set
default.s3.max_concurrent_requests
100
Ka tango ahau i nga huinga raraunga o nga waka tereina mai i te AWS S3 ka penapena i runga i te puku NVMe i runga i te tūmau tuatahi. Ko tenei huingararaunga he ~104GB i roto i te whakatakotoranga CSV-kopeke-GZIP.
$ sudo mkdir -p /ch/csv
$ sudo chown -R ubuntu /ch/csv
$ aws s3 sync s3://<bucket>/csv /ch/csv
ClickHouse tāutanga
Ka whakauruhia e ahau te tohatoha OpenJDK mo Java 8 i te mea e hiahiatia ana kia whakahaeretia a Apache ZooKeeper, e hiahiatia ana mo te whakaurunga tohatoha o ClickHouse i runga i nga miihini e toru.
$ sudo apt update
$ sudo apt install
openjdk-8-jre
openjdk-8-jdk-headless
Na ka whakaturia e ahau te taurangi taiao JAVA_HOME
.
$ sudo vi /etc/profile
export JAVA_HOME=/usr
$ source /etc/profile
Ka whakamahi ahau i te punaha whakahaere kete a Ubuntu ki te whakauru i te ClickHouse 18.16.1, titiro me te ZooKeeper ki runga i nga miihini e toru.
$ 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
Ka hanga e ahau he whaiaronga mo ClickHouse me te mahi ano i etahi whirihoranga i runga i nga tūmau e toru.
$ 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
Ko enei nga taapiri whirihoranga ka whakamahia e au.
<?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>
Ka whakahaere ahau i te ZooKeeper me te tūmau ClickHouse i runga i nga miihini e toru.
$ sudo /etc/init.d/zookeeper start
$ sudo service clickhouse-server start
Tukuake raraunga ki ClickHouse
I te tūmau tuatahi ka hanga e ahau he ripanga haerenga (trips
), ka penapena he huinga raraunga o nga haerenga taxi ma te whakamahi i te miihini 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;
Ka tangohia, ka utaina e ahau ia o nga konae CSV ki te ripanga haerenga (trips
). Ko nga mea e whai ake nei i oti i roto i te 55 meneti me te 10 hēkona. I muri i tenei mahi, ko te rahi o te whaiaronga raraunga ko 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)
Ko te tere kawemai ko te 155 MB o te ihirangi CSV kaore i kopaki mo ia hekona. E whakapae ana ahau na te kohungahunga i te whakakorenga GZIP. He tere ake pea ki te wetewete i nga konae kua konae katoa ki te whakarara ma te whakamahi xargs ka utaina nga raraunga kua wetekina. Kei raro nei he whakamaarama mo nga mea i panuitia i te wa o te tukanga kawemai 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
Ka whakawātea ahau i te mokowā i runga i te puku NVMe ma te whakakore i nga konae CSV taketake i mua i te haere tonu.
$ sudo rm -fr /ch/csv
Hurihia ki te Puka Tīwae
Ko te miihini Log ClickHouse ka penapena raraunga i roto i te whakatakotoranga-rarangi. Kia tere ake te uiui raraunga, ka huri au ki te whakatakotoranga poupou ma te whakamahi i te miihini MergeTree.
$ clickhouse-client --host=0.0.0.0
Ko nga mea e whai ake nei i oti i roto i te 34 meneti me te 50 hēkona. I muri i tenei mahi, ko te rahi o te whaiaronga raraunga ko 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;
Koinei te ahua o te putanga titiro i te wa e mahi ana:
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)
I te whakamatautau whakamutunga, he maha nga pou i hurihia me te tatau ano. I kitea e au kua kore etahi o enei mahi e mahi ana i runga i tenei huinga raraunga. Hei whakaoti i tenei raru, i tangohia e ahau nga mahi e kore e tika, ka utaina nga raraunga me te kore e huri ki nga momo maramara ake.
Te tohatoha o nga raraunga puta noa i te roopu
Ka tohatoha ahau i nga raraunga puta noa i nga kohinga kohinga e toru. Hei timata, kei raro nei ka hanga e ahau he tepu mo nga miihini e toru.
$ 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);
Katahi ahau ka whakarite kia kite te tūmau tuatahi i ngā kōpuku e toru i roto i te kāhui.
SELECT *
FROM system.clusters
WHERE cluster = 'perftest_3shards'
FORMAT Vertical;
Row 1:
──────
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:
──────
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:
──────
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:
Na ka tautuhia e ahau he ripanga hou i runga i te tūmau tuatahi e hāngai ana ki te aronuinga trips_mergetree_third
me te whakamahi i te miihini Tohaina.
CREATE TABLE trips_mergetree_x3
AS trips_mergetree_third
ENGINE = Distributed(perftest_3shards,
default,
trips_mergetree_third,
rand());
Ka kapehia e ahau nga raraunga mai i te ripanga MergeTree ki runga i nga kaitoro e toru. Ko nga mea e whai ake nei i oti i roto i te 34 meneti me te 44 hēkona.
INSERT INTO trips_mergetree_x3
SELECT * FROM trips_mergetree;
I muri i te mahi i runga ake nei, i hoatu e ahau ki a ClickHouse nga meneti 15 ki te neke atu i te tohu taumata rokiroki teitei. Ko nga raarangi raraunga ka mutu ko 264 GB, 34 GB me 33 GB i runga i ia o nga tūmau e toru.
ClickHouse tautau mahi aromatawai
Ko taku i kite i muri mai ko te wa tere kua kite ahau e whakahaere ana i ia patai ki runga tepu i nga wa maha trips_mergetree_x3
.
$ clickhouse-client --host=0.0.0.0
Ko nga mea e whai ake nei i oti i roto i te 2.449 hēkona.
SELECT cab_type, count(*)
FROM trips_mergetree_x3
GROUP BY cab_type;
Ko nga mea e whai ake nei i oti i roto i te 0.691 hēkona.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree_x3
GROUP BY passenger_count;
Ko nga mea e whai ake nei i oti i roto i te 0 hēkona.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree_x3
GROUP BY passenger_count,
year;
Ko nga mea e whai ake nei i oti i roto i te 0.983 hēkona.
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;
Hei whakataurite, i whakahaerehia e au nga patai ano i runga i te ripanga-MergeTree e noho ana i runga i te tūmau tuatahi.
Aromātai mahi o te kōpuku ClickHouse kotahi
Ko taku i kite i muri mai ko te wa tere kua kite ahau e whakahaere ana i ia patai ki runga tepu i nga wa maha trips_mergetree_x3
.
Ko nga mea e whai ake nei i oti i roto i te 0.241 hēkona.
SELECT cab_type, count(*)
FROM trips_mergetree
GROUP BY cab_type;
Ko nga mea e whai ake nei i oti i roto i te 0.826 hēkona.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree
GROUP BY passenger_count;
Ko nga mea e whai ake nei i oti i roto i te 1.209 hēkona.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree
GROUP BY passenger_count,
year;
Ko nga mea e whai ake nei i oti i roto i te 1.781 hēkona.
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;
He whakaaro mo nga hua
Koinei te wa tuatahi ka taea e tetahi papaarangi CPU-kore utu ki te pai ake i te papaaarangi GPU i roto i aku whakamatautau. Ko taua putunga korero-a-GPU e rua nga whakarereketanga mai i tera wa, engari ko nga mahi i tukuna e ClickHouse i runga i te node kotahi he mea whakamiharo.
I te wa ano, i te wa e mahia ana te Uiui 1 i runga i te miihini toha, ko nga utu o runga he ota teitei ake. Ko taku tumanako i ngaro tetahi mea i roto i taku rangahau mo tenei whakairinga na te mea he pai ki te kite i te heke o nga waa patai i taku taapiri i etahi atu pona ki te tautau. Heoi, he pai ki te mahi i etahi atu patai, ka piki ake te mahinga ma te 2 nga wa.
He pai ki te kite i a ClickHouse e whanake ana ki te wehe i te rokiroki me te tatau kia taea ai e raatau te awhi takitahi. Ko te tautoko HDFS, i taapirihia i tera tau, ka taea pea te mahi ki tenei. Mo te mahi rorohiko, mena ka taea te whakatere i te patai kotahi ma te taapiri i etahi atu pona ki te tautau, katahi ka tino marama te heke mai o tenei rorohiko.
Mauruuru koe mo te whai wa ki te panui i tenei panui. Ka tukuna e au nga ratonga tohutohu, hoahoanga, me nga mahi whanaketanga ki nga kaihoko i Amerika Te Tai Tokerau me Uropi. Mena kei te pirangi koe ki te matapaki me pehea e taea ai e aku whakaaro te awhina i to pakihi, tena koa waea mai ki a au
Source: will.com