Ukuguqulelwa kwenqaku kulungiselelwe ngokukodwa abafundi bekhosi .
ngumthombo ovulekileyo wesiseko sedatha yekholam. Yindawo entle apho amakhulu abahlalutyi banokukhawuleza babuze idatha eneenkcukacha, nanjengokuba amashumi eebhiliyoni zeerekhodi ezintsha zingeniswa ngosuku. Iindleko zeziseko zophuhliso zokuxhasa inkqubo enjalo zinokuphakama ukuya kutsho kwi-100 yeedola ngonyaka, kwaye kusenokwenzeka ukuba sisiqingatha kuxhomekeke ekusetyenzisweni. Ngesinye isikhathi, ukufakwa kweClickHouse kwi-Yandex Metrics kuqulethe iirekhodi ze-10 trillion. Ukongeza kwiYandex, iClickHouse ifumene impumelelo kunye neBloomberg kunye ne-Cloudflare.
Kwiminyaka emibini edlulileyo ndachitha oovimba beenkcukacha besebenzisa umatshini omnye, kwaye yaba Isoftware yedatabase yasimahla endakha ndayibona. Ukususela ngoko, abaphuhlisi abazange bayeke ukongeza iimpawu, kuquka inkxaso ye-Kafka, i-HDFS kunye ne-ZStandard compression. Kunyaka ophelileyo bongeze inkxaso yeendlela zoxinzelelo lwe-cascading, kunye ikhowudi yaba yinto enokwenzeka. Xa ucinezela idatha yothotho lwexesha, amaxabiso egeyiji anokucinezelwa kakuhle kusetyenziswa i-delta encoding, kodwa kwizinto zokubala kuya kuba ngcono ukusebenzisa i-delta-by-delta encoding. Uxinzelelo oluhle lube ngundoqo ekusebenzeni kweClickHouse.
I-ClickHouse inemigca eyi-170 yewaka lekhowudi ye-C ++, ngaphandle kweelayibrari zeqela lesithathu, kwaye yenye yezona ndawo zincinci zekhowudi zekhowudi. Ngokuthelekisa, i-SQLite ayixhasi ukuhanjiswa kwaye iqulethe i-235 amawaka emigca yekhowudi ye-C. Njengoko kulo mbhalo, iinjineli ze-207 ziye zafaka isandla kwi-ClickHouse, kwaye ukuqina kokuzibophelela kuye kwanda kutshanje.
NgoMatshi ka-2017, iClickHouse yaqala ukuqhuba njengendlela elula yokugcina umkhondo wophuhliso. Baphinde baqhekeza ifayile yamaxwebhu e-monolithic kwifayile ye-Markdown-based hierarchy. Imiba kunye neempawu zilandelwa nge-GitHub, kwaye ngokubanzi isoftware ifikeleleke kakhulu kwiminyaka embalwa edlulileyo.
Kweli nqaku, ndiza kujonga ukusebenza kweClickHouse cluster kwi-AWS EC2 usebenzisa i-36-core processors kunye nokugcinwa kwe-NVMe.
UHLAZIYO: Kwiveki emva kokupapasha le posi kwasekuqaleni, ndiye ndaphinda uvavanyo ngolungelelwaniso oluphuculweyo kwaye ndafumana iziphumo ezingcono kakhulu. Esi sithuba sihlaziyiwe ukubonisa olu tshintsho.
Ukuphehlelela i-AWS EC2 Cluster
Ndiza kusebenzisa iimeko ezintathu ze-c5d.9xlarge EC2 kwesi sithuba. Ngamnye wabo uqulethe i-36 ye-CPU ye-virtual, i-72 GB ye-RAM, i-900 GB ye-NVMe SSD yokugcina kwaye isekela inethiwekhi ye-Gigabit ye-10. Babiza i-$ 1,962 ngeyure nganye kummandla we-eu-west-1 xa beqhuba ngokwemfuno. Ndiza kusebenzisa Ubuntu Server 16.04 LTS njengenkqubo yokusebenza.
I-firewall iqwalaselwe ukuze umatshini ngamnye akwazi ukunxibelelana omnye nomnye ngaphandle kwezithintelo, kwaye kuphela idilesi yam ye-IPv4 efakwe kuluhlu olumhlophe yi-SSH kwiqela.
I-NVMe drive ikwimo yokulungela ukusebenza
Ukuze iClickHouse isebenze, ndiza kudala inkqubo yefayile kwi-EXT4 ifomathi kwi-NVMe drive kwiseva nganye.
$ sudo mkfs -t ext4 /dev/nvme1n1
$ sudo mkdir /ch
$ sudo mount /dev/nvme1n1 /chEmva kokuba yonke into icwangcisiwe, unokubona indawo yokunyuka kunye ne-783 GB yendawo ekhoyo kwinkqubo nganye.
$ 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% /chIseti yedatha endiza kuyisebenzisa kolu vavanyo yindawo yokulahla idatha endayivelisa kwi-1.1 yebhiliyoni yohambo lweeteksi oluthathwe kwisiXeko saseNew York kwiminyaka emithandathu. Kwiblogi iinkcukacha ngendlela endiyiqokelele ngayo le seti yedatha. Zigcinwe kwi-AWS S3, ngoko ke ndiya kumisela i-AWS CLI ngokufikelela kwam kunye nezitshixo eziyimfihlo.
$ sudo apt update
$ sudo apt install awscli
$ aws configureNdizakuseta umda wesicelo somthengi ngexesha elinye ukuya kwi-100 ukuze iifayile zikhuphele ngokukhawuleza kunoseto olungagqibekanga.
$ aws configure set
default.s3.max_concurrent_requests
100Ndiza kukhuphela idatha yokukhwela iteksi ukusuka kwi-AWS S3 kwaye ndiyigcine kwi-NVMe drive kwiseva yokuqala. Le dataset yi ~104GB kwifomathi ye-CSV ecinezelweyo ye-GZIP.
$ sudo mkdir -p /ch/csv
$ sudo chown -R ubuntu /ch/csv
$ aws s3 sync s3://<bucket>/csv /ch/csvUfakelo lweClickHouse
Ndiza kufaka ukuhanjiswa kwe-OpenJDK ye-Java 8 njengoko ifuneka ukuba iqhube i-Apache ZooKeeper, efunekayo kufakelo olusasaziweyo lwe-ClickHouse kubo bonke oomatshini abathathu.
$ sudo apt update
$ sudo apt install
openjdk-8-jre
openjdk-8-jdk-headless
Emva koko ndibeka imo eguquguqukayo JAVA_HOME.
$ sudo vi /etc/profile
export JAVA_HOME=/usr
$ source /etc/profileEmva koko ndiza kusebenzisa inkqubo yolawulo lwephakheji ye-Ubuntu ukufaka i-ClickHouse 18.16.1, ukujonga kunye ne-ZooKeeper kubo bonke oomatshini abathathu.
$ 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
zookeeperdNdiza kwenza uluhlu lweClickHouse kwaye ndenze uqwalaselo olungaphezulu kuzo zontathu iiseva.
$ 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.confOlu luqwalaselo olugqithileyo endiza kulisebenzisa.
<?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>Emva koko ndiza kuqhuba iZooKeeper kunye neseva yeClickHouse kubo bonke oomatshini bobathathu.
$ sudo /etc/init.d/zookeeper start
$ sudo service clickhouse-server startKulayishwa idatha kwiClickHouse
Kumncedisi wokuqala ndizakwenza itafile yohambo (trips), eya kugcina iseti yedatha yeehambo zeeteksi kusetyenziswa injini yeLog.
$ 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;
Ndiye ndikhuphe kwaye ndilayishe nganye yeefayile ze-CSV kwitafile yohambo (trips). Oku kulandelayo kugqitywe kwimizuzu engama-55 kunye nemizuzwana eyi-10. Emva kwalo msebenzi, ubungakanani boluhlu lwedatha lwaluyi-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)Isantya sokungenisa sasiyi-155 MB yesiqulatho se-CSV esinganyanzeliswanga ngomzuzwana. Ndiyakrokrela ukuba oku bekungenxa ye-bottleneck kwi-GZIP decompression. Inokuba kube ngokukhawuleza ukuvula zonke iifayile ze-gzip ngokunxuseneyo usebenzisa i-xargs kwaye emva koko ulayishe idatha engafakwanga. Ngezantsi yinkcazo yento ebixelwe ngexesha lenkqubo yokungeniswa kweCSV.
$ 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/23:1HNdiza kukhulula indawo kwi-NVMe drive ngokucima iifayile ze-CSV zoqobo ngaphambi kokuqhubeka.
$ sudo rm -fr /ch/csvGuqula kwiFomu yeKholam
Injini ye-Log ClickHouse iya kugcina idatha kwifomati ejolise kumqolo. Ukubuza idatha ngokukhawuleza, ndiyiguqulela kwifomathi yekholamu usebenzisa i-injini ye-MergeTree.
$ clickhouse-client --host=0.0.0.0Oku kulandelayo kugqitywe ngemizuzu engama-34 kunye nemizuzwana engama-50. Emva kwalo msebenzi, ubungakanani boluhlu lwedatha lwaluyi-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;Nantsi indlela imveliso yokujonga ejonge ngayo ngexesha lomsebenzi:
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)Kuvavanyo lokugqibela, iikholamu ezininzi zaguqulwa zaphinda zabalwa kwakhona. Ndifumanise ukuba eminye yale misebenzi ayisasebenzi njengoko bekulindelekile kule datha. Ukusombulula le ngxaki, ndisuse imisebenzi engafanelekanga kwaye ndilayishe idatha ngaphandle kokuguqula kwiintlobo ezininzi zegranular.
Ukusasazwa kwedatha kulo lonke iqela
Ndiza kusasaza idatha kuzo zonke iindawo ezintathu zeqela. Ukuqala, ngezantsi ndiza kudala itafile kubo bonke oomatshini bobathathu.
$ 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);Emva koko ndiya kuqinisekisa ukuba umncedisi wokuqala unokubona zonke iindawo ezintathu kwiqela.
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:
Emva koko ndiza kuchaza itafile entsha kwiseva yokuqala esekwe kwi-schema trips_mergetree_third kwaye isebenzisa i-injini yoSasazo.
CREATE TABLE trips_mergetree_x3
AS trips_mergetree_third
ENGINE = Distributed(perftest_3shards,
default,
trips_mergetree_third,
rand());Emva koko ndiya kukopa idatha kwi-MergeTree esekelwe kwitafile kuzo zonke iiseva ezintathu. Oku kulandelayo kugqitywe ngemizuzu engama-34 kunye nemizuzwana engama-44.
INSERT INTO trips_mergetree_x3
SELECT * FROM trips_mergetree;Emva kokusebenza okungentla, ndinike i-ClickHouse imizuzu eyi-15 ukuba ihambe ukusuka kwinqanaba eliphezulu lokugcina uphawu. Izikhokelo zedatha zaphela zibe yi-264 GB, i-34 GB kunye ne-33 GB ngokulandelanayo kwiseva nganye kwiiseva ezintathu.
Uvandlakanyo lokusebenza lweqela leClickHouse
Into endiyibone ngokulandelayo yayilelona xesha likhawulezayo endilibonileyo liqhuba umbuzo ngamnye kwitafile amatyeli amaninzi trips_mergetree_x3.
$ clickhouse-client --host=0.0.0.0Okulandelayo kugqitywe ngemizuzwana eyi-2.449.
SELECT cab_type, count(*)
FROM trips_mergetree_x3
GROUP BY cab_type;Okulandelayo kugqitywe ngemizuzwana eyi-0.691.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree_x3
GROUP BY passenger_count;Oku kulandelayo kugqitywe ngemizuzwana eyi-0.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree_x3
GROUP BY passenger_count,
year;Okulandelayo kugqitywe ngemizuzwana eyi-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;Ukuthelekisa, ndibaleke imibuzo efanayo kwitafile esekwe kwiMergeTree ehlala kuphela kumncedisi wokuqala.
Uvavanyo lokwenziwa komsebenzi kwindawo enye yeClickHouse
Into endiyibone ngokulandelayo yayilelona xesha likhawulezayo endilibonileyo liqhuba umbuzo ngamnye kwitafile amatyeli amaninzi trips_mergetree_x3.
Okulandelayo kugqitywe ngemizuzwana eyi-0.241.
SELECT cab_type, count(*)
FROM trips_mergetree
GROUP BY cab_type;Okulandelayo kugqitywe ngemizuzwana eyi-0.826.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree
GROUP BY passenger_count;Okulandelayo kugqitywe ngemizuzwana eyi-1.209.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree
GROUP BY passenger_count,
year;Okulandelayo kugqitywe ngemizuzwana eyi-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;Iingcamango ngeziphumo
Eli lixesha lokuqala ukuba i-database esekelwe kwi-CPU yasimahla ikwazile ukodlula i-database esekwe kwi-GPU kwiimvavanyo zam. Le database isekwe kwi-GPU idlulile kuhlaziyo kabini ukusukela ngoko, kodwa ukusebenza okwenziwa yiClickHouse kwindawo enye nangona kunjalo kuyamangalisa kakhulu.
Ngexesha elifanayo, xa uqhuba i-Query 1 kwi-injini esasazwayo, iindleko eziphezulu zingumyalelo wobukhulu obuphezulu. Ndiyathemba ukuba ndiphoswe yinto ethile kuphando lwam kwesi sithuba kuba kuya kuba kuhle ukubona amaxesha emibuzo ehla njengoko ndongeza iindawo ezininzi kwiqela. Nangona kunjalo, kuhle ukuba xa kusenziwa eminye imibuzo, ukusebenza kunyuke malunga namaxesha ama-2.
Kuya kuba kuhle ukubona iClickHouse iguqukela ekubeni ikwazi ukwahlula indawo yokugcina kunye nokubala ukuze bakwazi ukuzimela ngokuzimeleyo. Inkxaso ye-HDFS, eyongeziweyo kunyaka odlulileyo, ingaba linyathelo elibhekiselele koku. Ngokumalunga ne-computing, ukuba umbuzo omnye unokukhawuleziswa ngokongeza iindawo ezininzi kwiqela, ngoko ikamva lale software liqaqambile kakhulu.
Enkosi ngokuthatha ixesha lokufunda le post. Ndinikezela ngokucebisana, ulwakhiwo, kunye neenkonzo zophuhliso lokuziqhelanisa kubathengi baseMntla Melika naseYurophu. Ukuba ungathanda ukuxoxa ngendlela iingcebiso zam ezinokulinceda ngayo ishishini lakho, nceda uqhagamshelane nam ngokusebenzisa .
umthombo: www.habr.com