It-traduzzjoni tal-artiklu tħejjiet speċifikament għall-istudenti tal-kors .
hija database ta' kolonni open source. Huwa ambjent mill-aqwa fejn mijiet ta' analisti jistgħu malajr jistaqsu dejta dettaljata, anke meta jiddaħħlu għexieren ta' biljuni ta' rekords ġodda kuljum. L-ispejjeż tal-infrastruttura biex isostnu sistema bħal din jistgħu jkunu għoljin sa $100 fis-sena, u potenzjalment nofshom skont l-użu. F'ħin minnhom, l-installazzjoni ClickHouse minn Yandex Metrics kien fiha 10 triljun rekords. Minbarra Yandex, ClickHouse sabet ukoll suċċess ma 'Bloomberg u Cloudflare.
Sentejn ilu qattajt databases li jużaw magna waħda, u sar softwer tad-database b'xejn li qatt rajt. Minn dakinhar, l-iżviluppaturi komplew iżidu karatteristiċi, inkluż appoġġ għall-kompressjoni Kafka, HDFS u ZStandard. Is-sena li għaddiet żiedu appoġġ għal metodi ta 'kompressjoni kaskata, u il-kodifikazzjoni saret possibbli. Meta tikkompressa d-dejta tas-serje tal-ħin, il-valuri tal-kejl jistgħu jiġu kkompressati sew bl-użu tal-kodifikazzjoni delta, iżda għall-counters ikun aħjar li tuża kodifikazzjoni delta b'delta. Kompressjoni tajba saret iċ-ċavetta għall-prestazzjoni ta 'ClickHouse.
ClickHouse tikkonsisti minn 170 elf linja ta 'kodiċi C++, esklużi libreriji ta' partijiet terzi, u hija waħda mill-iżgħar bażijiet ta 'kodiċi ta' database distribwiti. B'paragun, SQLite ma jappoġġjax id-distribuzzjoni u jikkonsisti f'235 elf linja ta 'kodiċi C. Minn din il-kitba, 207 inġiniera kkontribwew għal ClickHouse, u l-intensità tal-kommits qed tiżdied reċentement.
F'Marzu 2017, ClickHouse bdiet tmexxi bħala mod faċli biex iżżomm rekord tal-iżvilupp. Huma wkoll kissru l-fajl ta 'dokumentazzjoni monolitika f'ġerarkija ta' fajl ibbażata fuq Markdown. Kwistjonijiet u karatteristiċi huma ssorveljati permezz ta 'GitHub, u b'mod ġenerali s-softwer sar ħafna aktar aċċessibbli f'dawn l-aħħar ftit snin.
F'dan l-artikolu, ser nagħti ħarsa lejn il-prestazzjoni ta 'cluster ClickHouse fuq AWS EC2 bl-użu ta' proċessuri 36-core u ħażna NVMe.
AĠĠORNAMENT: Ġimgħa wara li oriġinarjament ippublikajt din il-kariga, erġajt it-test b'konfigurazzjoni mtejba u ksibt riżultati ferm aħjar. Din il-kariga ġiet aġġornata biex tirrifletti dawn il-bidliet.
Tnedija ta' AWS EC2 Cluster
Se nkun qed nuża tliet istanzi c5d.9xlarge EC2 għal din il-kariga. Kull wieħed minnhom fih 36 CPUs virtwali, 72 GB ta 'RAM, 900 GB ta' ħażna NVMe SSD u jappoġġja netwerk 10 Gigabit. Dawn jiswew $1,962/siegħa kull wieħed fir-reġjun tal-eu-west-1 meta jaħdmu fuq talba. Se nkun qed nuża Ubuntu Server 16.04 LTS bħala s-sistema operattiva.
Il-firewall huwa kkonfigurat sabiex kull magna tkun tista 'tikkomunika ma' xulxin mingħajr restrizzjonijiet, u l-indirizz IPv4 tiegħi biss huwa whitelisted minn SSH fil-cluster.
Drive NVMe fl-istat ta' prontezza operattiva
Biex ClickHouse taħdem, se noħloq sistema ta 'fajls fil-format EXT4 fuq drive NVMe fuq kull wieħed mis-servers.
$ sudo mkfs -t ext4 /dev/nvme1n1
$ sudo mkdir /ch
$ sudo mount /dev/nvme1n1 /chLadarba kollox ikun ikkonfigurat, tista 'tara l-punt tal-muntatura u s-783 GB ta' spazju disponibbli fuq kull sistema.
$ 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
└─nvme0n1p1 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% /chIs-sett tad-dejta li ser nuża f'dan it-test huwa dump tad-dejta li ġġenerajt minn 1.1 biljun vjaġġ tat-taxi meħuda fi New York City fuq sitt snin. Fuq il-blog dettalji dwar kif ġbart dan is-sett tad-dejta. Huma maħżuna fl-AWS S3, għalhekk ser nikkonfigura l-AWS CLI bl-aċċess u ċ-ċwievet sigrieti tiegħi.
$ sudo apt update
$ sudo apt install awscli
$ aws configureSer nissettja l-limitu tat-talba konkorrenti tal-klijent għal 100 sabiex il-fajls jitniżżel aktar malajr mis-settings default.
$ aws configure set
default.s3.max_concurrent_requests
100Niżżel is-sett tad-dejta tat-taxi rides minn AWS S3 u naħżen fuq drive NVMe fuq l-ewwel server. Dan is-sett tad-dejta huwa ~104GB f'format CSV kompressat b'GZIP.
$ sudo mkdir -p /ch/csv
$ sudo chown -R ubuntu /ch/csv
$ aws s3 sync s3://<bucket>/csv /ch/csvInstallazzjoni ClickHouse
Se ninstalla d-distribuzzjoni OpenJDK għal Java 8 peress li hija meħtieġa biex tħaddem Apache ZooKeeper, li hija meħtieġa għal installazzjoni mqassma ta' ClickHouse fuq it-tliet magni kollha.
$ sudo apt update
$ sudo apt install
openjdk-8-jre
openjdk-8-jdk-headless
Imbagħad issettja l-varjabbli ambjentali JAVA_HOME.
$ sudo vi /etc/profile
export JAVA_HOME=/usr
$ source /etc/profileImbagħad se nuża s-sistema ta 'ġestjoni tal-pakketti ta' Ubuntu biex ninstalla ClickHouse 18.16.1, ħarsiet u ZooKeeper fuq it-tliet magni kollha.
$ 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
zookeeperdSer noħloq direttorju għal ClickHouse u nagħmel ukoll xi konfigurazzjoni overrides fuq it-tliet servers kollha.
$ 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.confDawn huma l-konfigurazzjoni overrides li se nkun qed nuża.
<?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>Imbagħad se nħaddem ZooKeeper u s-server ClickHouse fuq it-tliet magni kollha.
$ sudo /etc/init.d/zookeeper start
$ sudo service clickhouse-server startTlugħ tad-dejta fuq ClickHouse
Fuq l-ewwel server se noħloq tabella tal-vjaġġ (trips), li se jaħżen dataset ta' vjaġġi bit-taxi bl-użu tal-magna 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;
Imbagħad niġbor u tagħbija kull wieħed mill-fajls CSV f'tabella tal-vjaġġ (trips). Dan li ġej tlesta f'55 minuta u 10 sekondi. Wara din l-operazzjoni, id-daqs tad-direttorju tad-dejta kien 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)Il-veloċità tal-importazzjoni kienet 155 MB ta' kontenut CSV mhux kompressat kull sekonda. Nissuspetta li dan kien minħabba ostakolu fid-dekompressjoni tal-GZIP. Seta' kien aktar mgħaġġel li tħoll il-fajls kollha b'żipp b'mod parallel bl-użu ta' xargs u mbagħad tgħabbi d-dejta żżippjata. Hawn taħt hawn deskrizzjoni ta 'dak li ġie rrappurtat matul il-proċess ta' importazzjoni CSV.
$ 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/23:1HNillibera spazju fuq id-drajv NVMe billi nħassar il-fajls CSV oriġinali qabel inkompli.
$ sudo rm -fr /ch/csvIkkonverti għall-Formola tal-Kolonna
Il-magna Log ClickHouse se taħżen id-dejta f'format orjentat lejn ir-ringieli. Biex nistaqsi d-dejta aktar malajr, nikkonvertiha f'format kolonni billi tuża l-magna MergeTree.
$ clickhouse-client --host=0.0.0.0Dan li ġej tlesta f'34 minuta u 50 sekonda. Wara din l-operazzjoni, id-daqs tad-direttorju tad-dejta kien 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;Dan huwa kif dehret l-output t'għajn waqt l-operazzjoni:
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)Fl-aħħar test, diversi kolonni ġew konvertiti u kkalkulati mill-ġdid. Sibt li xi wħud minn dawn il-funzjonijiet m'għadhomx jaħdmu kif mistenni fuq dan is-sett tad-dejta. Biex issolvi din il-problema, neħħejt il-funzjonijiet mhux xierqa u tgħabba d-dejta mingħajr ma kkonverti għal tipi aktar granulari.
Distribuzzjoni tad-data madwar il-cluster
Se nqassam id-dejta fit-tliet nodi tal-cluster. Biex tibda, hawn taħt se noħloq tabella fuq it-tliet magni.
$ 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);Imbagħad ser niżgura li l-ewwel server jista 'jara t-tliet nodi fil-cluster.
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:
Imbagħad ser niddefinixxi tabella ġdida fuq l-ewwel server li hija bbażata fuq l-iskema trips_mergetree_third u juża l-magna Distributed.
CREATE TABLE trips_mergetree_x3
AS trips_mergetree_third
ENGINE = Distributed(perftest_3shards,
default,
trips_mergetree_third,
rand());Imbagħad ser nikkopja d-dejta mit-tabella bbażata fuq MergeTree għat-tliet servers kollha. Dan li ġej tlesta f'34 minuta u 44 sekonda.
INSERT INTO trips_mergetree_x3
SELECT * FROM trips_mergetree;Wara l-operazzjoni ta 'hawn fuq, tajt lil ClickHouse 15-il minuta biex titbiegħed mill-marka tal-livell massimu ta' ħażna. Id-direttorji tad-dejta spiċċaw 264 GB, 34 GB u 33 GB rispettivament fuq kull wieħed mit-tliet servers.
Evalwazzjoni tal-prestazzjoni tal-cluster ClickHouse
Dak li rajt li jmiss kien l-iktar ħin mgħaġġel li rajt imexxi kull mistoqsija fuq mejda diversi drabi trips_mergetree_x3.
$ clickhouse-client --host=0.0.0.0Dan li ġej tlesta f'2.449 sekondi.
SELECT cab_type, count(*)
FROM trips_mergetree_x3
GROUP BY cab_type;Dan li ġej tlesta f'0.691 sekondi.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree_x3
GROUP BY passenger_count;Dan li ġej tlesta f'0 sekondi.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree_x3
GROUP BY passenger_count,
year;Dan li ġej tlesta f'0.983 sekondi.
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;Għal paragun, għamilt l-istess mistoqsijiet fuq tabella bbażata fuq MergeTree li tirrisjedi biss fuq l-ewwel server.
Evalwazzjoni tal-prestazzjoni ta' node ClickHouse wieħed
Dak li rajt li jmiss kien l-iktar ħin mgħaġġel li rajt imexxi kull mistoqsija fuq mejda diversi drabi trips_mergetree_x3.
Dan li ġej tlesta f'0.241 sekondi.
SELECT cab_type, count(*)
FROM trips_mergetree
GROUP BY cab_type;Dan li ġej tlesta f'0.826 sekondi.
SELECT passenger_count,
avg(total_amount)
FROM trips_mergetree
GROUP BY passenger_count;Dan li ġej tlesta f'1.209 sekondi.
SELECT passenger_count,
toYear(pickup_date) AS year,
count(*)
FROM trips_mergetree
GROUP BY passenger_count,
year;Dan li ġej tlesta f'1.781 sekondi.
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;Riflessjonijiet fuq ir-riżultati
Din hija l-ewwel darba li database bbażata fuq CPU b'xejn kienet kapaċi tegħleb database bbażata fuq GPU fit-testijiet tiegħi. Dik id-database bbażata fuq GPU għaddiet minn żewġ reviżjonijiet minn dakinhar, iżda l-prestazzjoni li ClickHouse wassal fuq nodu wieħed hija madankollu impressjonanti ħafna.
Fl-istess ħin, meta tesegwixxi Mistoqsija 1 fuq magna distribwita, l-ispejjeż ġenerali huma ordni ta 'kobor ogħla. Nispera li tlift xi ħaġa fir-riċerka tiegħi għal din il-kariga għax ikun sabiħ li nara l-ħinijiet tal-mistoqsijiet jonqsu hekk kif inżid aktar nodi mal-cluster. Madankollu, huwa kbir li meta tesegwixxi mistoqsijiet oħra, il-prestazzjoni żdiedet b'madwar 2 darbiet.
Ikun sabiħ li tara ClickHouse tevolvi biex tkun tista' tissepara l-ħażna u l-komputazzjoni sabiex ikunu jistgħu jiskalaw b'mod indipendenti. L-appoġġ tal-HDFS, li ġie miżjud is-sena li għaddiet, jista 'jkun pass lejn dan. F'termini ta 'kompjuters, jekk mistoqsija waħda tista' tiġi aċċellerata billi żżid aktar nodi mal-cluster, allura l-futur ta 'dan is-software huwa qawwi ħafna.
Grazzi talli ħadt il-ħin biex taqra din il-kariga. Noffri servizzi ta' konsulenza, arkitettura u żvilupp ta' prattika lill-klijenti fl-Amerika ta' Fuq u fl-Ewropa. Jekk tixtieq tiddiskuti kif is-suġġerimenti tiegħi jistgħu jgħinu lin-negozju tiegħek, jekk jogħġbok ikkuntattjani permezz .
Sors: www.habr.com