ClickHouse 快速入门

ClickHouse 是什么

ClickHouse 是一个开源的面向联机分析处理(OLAP, On-Line Analytical Processing) 的列式存储数据库管理系统。

在一个 "常规" 的行式数据库管理系统中，数据按下面的顺序存储：
id | name | age
---|---|---
1| Zhangsan | 18
2| GlonHo | 20
3| Lisi | 22
...|...|...

换言之，所有相关的值在一个行里面一个挨一个存储。行式存储的的数据库管理系统有：MySQL, Postgres, MS SQL Server 等。

在一个列式存储数据库管理系统中，数据存储的方式如下所示：
```
id: 1 2 3 ...
name: Zhangsan GlonHo Lisi ...
age: 18 20 22 ... 
```

列式存储的数据库管理系统更适合于 OLAP 场景（对于大多数查询，至少有 100 倍的处理速度提升）的原因有：

I/O 方面：

对于一个分析的查询，只需要表中少量的列。在一个列式存储数据库管理系统中，可以只读取你需要的数据。例如，如果你只需要从 100 列中读取 5 列，那么预期可以减少 20倍 I/O
列式存储数据，更易于压缩，进一步减少 I/O
由于减少了 I/O，系统中可以缓存更多符合要求的数据

CPU 方面：

ClickHouse 独有特性

列式存储
数据压缩

不是所有的列式存储数据管理系统都会进行数据压缩，如：InfiniDB CE 和 MonetDB。然而，数据压缩真的提高了性能

支持磁盘存储数据

一些列式存储数据管理系统只能在 RAM(Random Access Memory)上面工作，如：SAP HANA 和 Google PowerDrill。但是对于海量数据，RAM 的成本太大了。

多核并行处理
分布式处理
类 SQL 支持

支持非标准 SQL。
不支持 NULL，不支持相关子查询，支持 JOIN，支持在 FROM、IN、 JOIN 子句中的子查询和标量子查询。

Vector 引擎

不止以列的形式存储数据，部分列还经过向量处理。这样能取得高 CPU 性能。

数据实时更新

ClickHouse支持主键表。为了迅速查询某个范围内的主键，数据使用合并树增量地进行排序。因此，数据可以不断被添加到表中，添加数据时没有加锁。

索引

允许有一个主键，

适用于在线查询

这使得 ClickHouse 可以用作 Web 系统的后端。低延时意味着查询可以被及时处理。

支持近似计算
支持嵌套的数据结构，支持数组
支持限制查询的复杂性
复制和支持复制节点的数据完整性

使用多主节点复制。数据被写入任何可用的复制节点后，分发给其他的复制节点。系统在不同的复制节点中维护相同的数据。在出现失败之后，数据会自动回复，或者在复杂的情况下使用一个 "按钮"。Data replication

入门指南

系统要求

ClickHouse 不是一个跨平台的系统，它要求 Linux Ubuntu 12.04 或更新版本，支持带有 4.2 SSE 指令集的 x86_64 架构。

检查是否支持 4.2 SSE 指令集：

grep -q sse4_2 /proc/cpuinfo && echo "SSE 4.2 supported" || echo "SSE 4.2 not supported"

推荐使用 Ubuntu 系统，连接终端必须是 UTF-8 编码（Ubuntu 默认是 UTF-8）。

安装

用系统安装包的方式

在 /etc/apt/sources.list 或者一个单独的 /etc/apt/sources.list.d/clickhouse.list 文件中添加 repository：

在 Ubuntu Trusty (14.04):

deb http://repo.yandex.ru/clickhouse/trusty stable main

对于其他 Ubuntu 版本，把替换 trusty 成 xenial 或者 precise。

然后执行：

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv E0C56BD4    # optional
sudo apt-get update
sudo apt-get install clickhouse-client clickhouse-server-common

也可以手动下载安装包：

http://repo.yandex.ru/clickhouse/trusty/pool/main/c/clickhouse/

http://repo.yandex.ru/clickhouse/xenial/pool/main/c/clickhouse/

http://repo.yandex.ru/clickhouse/precise/pool/main/c/clickhouse/

ClickHouse 包含访问限制设置，设置在 users.xml 文件中（和 config.xml 放在一起）。

默认情况下，允许自任何地方的默认用户无密码的访问。

用源码安装

Linux 平台跟着 build.md 中的介绍进行 build，Mac OS X 则跟着 build_osx.md 进行 build。

你可以编译包然后安装，也可以不安装。

Client: src/dbms/src/Client/
Server: src/dbms/src/Server/

对于 Server，创建一个数据目录，如：

/var/lib/clickhouse/data/default/
/var/lib/clickhouse/metadata/default/

在 server config 中配置，然后给所需用户 chown 分配权限。

注意：服务器配置的路径是：src/dbms/src/Server/config.xml

其他安装方式

Docker image: https://hub.docker.com/r/yandex/clickhouse-server/

Gentoo: https://github.com/kmeaw/clickhouse-overlay

运行

以守护进程(daemon)的方式启动服务：

sudo service clickhouse-server start

日志目录：

/var/log/clickhouse-server/

如果启动失败，检查配置文件：

/etc/clickhouse-server/config.xml

还可以在控制台启动服务：

clickhouse-server --config-file=/etc/clickhouse-server/config.xml

在这种情况下，日志会输出到控制台，这在开发的时候还是挺方便的。如果配置文件就在当前目录（即与 clickhouse-server 同一目录），无需使用参数 --config-file，默认读取 ./config-file。

可以使用命令行客户端来连接服务：

clickhouse-client

clickhouse-client 参数介绍：

--host, -h：目标服务器名，默认为 localhost
--port：目标端口，默认为 9000
--user, -u：连接用户，默认为 default
--password：连接用户密码，默认为空字符串
--query, -q：非交互模式下执行的命令
--database, -d：当前操作的数据库，默认选择配置文件配置的值（默认为 default 库）
--multiline, -m：如果设定，允许多行查询
--multiquery, -n：如果指定,允许处理由分号分隔的多个查询。只有在非交互式模式工作。
--format, -f：使用指定的默认格式输出结果
--vertical, -E：如果指定，默认使用垂直格式输出结果，等同于 --format=Vertical。在这种格式中，每个值可在单独的行上，显示宽表时很有用。
--time, -t：如果指定，在 stderr 中输出查询执行时间的非交互式模式下。
--stacktrace：如果指定，如果发生异常，也会输出堆栈跟踪。
--config-file：配置文件的名称，额外的设置或改变了上面列出的设置默认值。

默认情况下，配置文件的搜索顺序如下：

./clickhouse-client.xml
~/.clickhouse-client/config.xml
/etc/clickhouse-client/config.xml

如果三个文件同时存在N个，则以找到的第一个配置文件为准。

这个客户端还可以连接到一个远程服务端：

clickhouse-client --host=example.com

还可以指定将用于处理查询的任何设置，如：clickhouse-client --max_threads=1，表示查询处理线程的最大数量为 1。

检查系统：

root@GlonHo:~# clickhouse-client
ClickHouse client version 1.1.54198.
Connecting to localhost:9000.
Connected to ClickHouse server version 1.1.54198.
:)
:) select 1
SELECT 1
┌─1─┐
│ 1 │
└───┘
1 rows in set. Elapsed: 0.023 sec. 
:)

恭喜你，it works!

测试数据

如果你是 Yandex 的员工，你可以使用 Yandex.Metrica 的测试数据来探索系统的功能和性能，你在这里可以找到如何使用测试数据的介绍。另外，你可以使用一个公开的可用的数据集，看这里。

如果你有疑问

如果你是 Yandex 的员工，你可以使用 ClickHouse 内部邮件列表，你可以订阅这个列表来获取公告、新的发展信息和其他用户的问题。

另外，你可以在 Stack Overflow 上提问，在 [Google Groups] 上讨论，或者发邮件到开发者邮箱：clickhouse-feedback@yandex-team.com。

最后

ClickHouse 目前官方只支持 Ubuntu，对于 RedHat 并没有什么描述。在 CentOS 6.9 上编译安装的时候，特别麻烦，最后放弃了，后来在官方的 Google Groups 上找到一个 RedHat 的包安装方式（或者直接到 GitHub），但还是找不到对应版本的依赖，搜了一下，可能需要重新编译内核，也就放弃了。最终找了个 Ubuntu 14.04 LTS 来做的实验。

CentOS：

[root@GlonHo ~]# grep -q sse4_2 /proc/cpuinfo && echo "SSE 4.2 supported" || echo "SSE 4.2 not supported"
SSE 4.2 supported
[root@GlonHo ~]# yum-config-manager --add-repo http://repo.red-soft.biz/repos/clickhouse/repo/clickhouse-el6.repo
bash: yum-config-manager: command not found
[root@GlonHo ~]# yum -y install yum-utils
...
[root@GlonHo ~]# yum-config-manager --add-repo http://repo.red-soft.biz/repos/clickhouse/repo/clickhouse-el6.repo
Loaded plugins: fastestmirror
adding repo from: http://repo.red-soft.biz/repos/clickhouse/repo/clickhouse-el6.repo
grabbing file http://repo.red-soft.biz/repos/clickhouse/repo/clickhouse-el6.repo to /etc/yum.repos.d/clickhouse-el6.repo
clickhouse-el6.repo                                                                                                                                  |  165 B     00:00
repo saved to /etc/yum.repos.d/clickhouse-el6.repo
[root@GlonHo ~]# yum install clickhouse-server clickhouse-client clickhouse-server-common clickhouse-compressor -y
Loaded plugins: fastestmirror
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirrors.zju.edu.cn
 * epel: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.zju.edu.cn
 * updates: mirrors.163.com
base                                                                                                                         | 3.7 kB     00:00
clickhouse                                                                                                                   | 2.9 kB     00:02
extras                                                                                                                       | 3.4 kB     00:00
updates                                                                                                                      | 3.4 kB     00:00
Package clickhouse-server-common-1.1.54198-3.el6.x86_64 already installed and latest version
Package clickhouse-compressor-1.1.54198-3.el6.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package clickhouse-client.x86_64 0:1.1.54198-3.el6 will be installed
---> Package clickhouse-server.x86_64 0:1.1.54198-3.el6 will be installed
--> Processing Dependency: libbfd-2.20.51.0.2-5.44.el6.so()(64bit) for package: clickhouse-server-1.1.54198-3.el6.x86_64
--> Finished Dependency Resolution
Error: Package: clickhouse-server-1.1.54198-3.el6.x86_64 (clickhouse)
           Requires: libbfd-2.20.51.0.2-5.44.el6.so()(64bit)
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

Ubuntu：

root@GlonHo:~# grep -q sse4_2 /proc/cpuinfo && echo "SSE 4.2 supported" || echo "SSE 4.2 not supported"
SSE 4.2 supported
root@GlonHo:/etc/apt/sources.list.d# vim clickhouse.list
deb http://repo.yandex.ru/clickhouse/trusty stable main
root@GlonHo:~# apt-key adv --keyserver keyserver.ubuntu.com --recv E0C56BD4
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.IoJhY8ePkd --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv E0C56BD4
gpg: requesting key E0C56BD4 from hkp server keyserver.ubuntu.com
gpg: key E0C56BD4: public key "ClickHouse Repository Key <milovidov@yandex-team.ru>" imported
gpg: Total number processed: 1
gpg:               imported: 1  (RSA: 1)
root@GlonHo:~# apt-get update
Hit http://security.ubuntu.com trusty-security InRelease
Ign http://archive.ubuntu.com trusty InRelease
...
Reading package lists... Done
root@GlonHo:~# 
root@GlonHo:~# apt-get install clickhouse-client clickhouse-server-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  acl at-spi2-core colord dconf-gsettings-backend dconf-service fontconfig
  fontconfig-config fonts-dejavu-core hicolor-icon-theme libasound2
  libasound2-data libatk-bridge2.0-0 libatk1.0-0 libatk1.0-data libatspi2.0-0
  libavahi-client3 libavahi-common-data libavahi-common3 libcairo-gobject2
  libcairo2 libcanberra-gtk3-0 libcanberra-gtk3-module libcanberra0 libcolord1
  libcolorhug1 libcups2 libdatrie1 libdconf1 libdrm-intel1 libdrm-nouveau2
  libdrm-radeon1 libexif12 libfontconfig1 libfontenc1 libgd3
  libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libgl1-mesa-dri libgl1-mesa-glx
  libglapi-mesa libgphoto2-6 libgphoto2-l10n libgphoto2-port10 libgraphite2-3
  libgtk-3-0 libgtk-3-bin libgtk-3-common libgudev-1.0-0 libgusb2
  libharfbuzz0b libice6 libieee1284-3 libjasper1 libjbig0 libjpeg-turbo8
  libjpeg8 liblcms2-2 libllvm3.4 libltdl7 libnotify-bin libnotify4 libogg0
  libpango-1.0-0 libpangocairo-1.0-0 libpangoft2-1.0-0 libpciaccess0
  libpixman-1-0 libsane libsane-common libsm6 libtdb1 libthai-data libthai0
  libtiff5 libtxc-dxtn-s2tc0 libv4l-0 libv4lconvert0 libvorbis0a
  libvorbisfile3 libvpx1 libwayland-client0 libwayland-cursor0 libx11-xcb1
  libxaw7 libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0 libxcb-present0
  libxcb-render0 libxcb-shm0 libxcb-sync1 libxcomposite1 libxcursor1
  libxdamage1 libxfixes3 libxfont1 libxi6 libxinerama1 libxkbcommon0
  libxkbfile1 libxmu6 libxpm4 libxrandr2 libxrender1 libxshmfence1 libxt6
  libxtst6 libxxf86vm1 notification-daemon sound-theme-freedesktop x11-common
  x11-xkb-utils xfonts-base xfonts-encodings xfonts-utils xserver-common
  xserver-xorg-core
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  clickhouse-server-base
The following NEW packages will be installed:
  clickhouse-client clickhouse-server-base clickhouse-server-common
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 198 MB of archives.
After this operation, 632 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://repo.yandex.ru/clickhouse/trusty/ stable/main clickhouse-server-base amd64 1.1.54198 [198 MB]
Get:2 http://repo.yandex.ru/clickhouse/trusty/ stable/main clickhouse-client amd64 1.1.54198 [2,674 B]
Get:3 http://repo.yandex.ru/clickhouse/trusty/ stable/main clickhouse-server-common amd64 1.1.54198 [7,578 B]
Fetched 198 MB in 18min 7s (182 kB/s)
Selecting previously unselected package clickhouse-server-base.
(Reading database ... 62852 files and directories currently installed.)
Preparing to unpack .../clickhouse-server-base_1.1.54198_amd64.deb ...
Unpacking clickhouse-server-base (1.1.54198) ...
Selecting previously unselected package clickhouse-client.
Preparing to unpack .../clickhouse-client_1.1.54198_amd64.deb ...
Unpacking clickhouse-client (1.1.54198) ...
Selecting previously unselected package clickhouse-server-common.
Preparing to unpack .../clickhouse-server-common_1.1.54198_amd64.deb ...
Unpacking clickhouse-server-common (1.1.54198) ...
Processing triggers for ureadahead (0.100.0-16) ...
Setting up clickhouse-server-base (1.1.54198) ...
Processing triggers for ureadahead (0.100.0-16) ...
Setting up clickhouse-client (1.1.54198) ...
Setting up clickhouse-server-common (1.1.54198) ...
root@GlonHo:~#
root@GlonHo:~# top
Tasks:  90 total,   2 running,  88 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.2 sy,  0.0 ni, 99.8 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem:   2049856 total,  1147260 used,   902596 free,    16004 buffers
KiB Swap:        0 total,        0 used,        0 free.   960556 cached Mem
  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 1262 root      20   0  112712  34552   1112 S   0.0  1.7   0:00.00 ruby
 1196 root      20   0  182364  34428   2728 S   0.0  1.7   0:00.77 puppet
 **2368 clickho+  20   0  241336  12524   3504 S   0.0  0.6   0:00.04 clickhouse-serv**
 1973 root      20   0  107720   4216   3220 S   0.0  0.2   0:00.02 sshd      
root@GlonHo:~# ls /var/log/clickhouse-server/
clickhouse-server.err.log  clickhouse-server.log  stderr  stdout
root@GlonHo:~# cat /var/log/clickhouse-server/clickhouse-server.err.log
2017.04.24 09:30:03.783101 [ 1 ] <Warning> ConfigProcessor: Include not found: networks
2017.04.24 09:30:03.783125 [ 1 ] <Warning> ConfigProcessor: Include not found: networks
2017.04.24 09:30:05.803298 [ 2 ] <Warning> ConfigProcessor: Include not found: clickhouse_remote_servers
2017.04.24 09:30:05.803353 [ 2 ] <Warning> ConfigProcessor: Include not found: clickhouse_compression
root@GlonHo:~# 
root@GlonHo:~# cat /var/log/clickhouse-server/clickhouse-server.log
2017.04.24 09:30:03.708578 [ 1 ] <Information> : Starting daemon with revision 54198
2017.04.24 09:30:03.781176 [ 1 ] <Information> Application: starting up
2017.04.24 09:30:03.781650 [ 1 ] <Debug> Application: rlimit on number of file descriptors is 262144
2017.04.24 09:30:03.781664 [ 1 ] <Debug> Application: Initializing DateLUT.
2017.04.24 09:30:03.781670 [ 1 ] <Trace> Application: Initialized DateLUT with time zone `UTC'.
2017.04.24 09:30:03.782226 [ 1 ] <Debug> Application: Configuration parameter 'interserver_http_host' doesn't exist or exists and empty. Will use 'ubuntu' as replica host.
2017.04.24 09:30:03.782338 [ 1 ] <Debug> ConfigReloader: Loading config `/etc/clickhouse-server/users.xml'
2017.04.24 09:30:03.783093 [ 1 ] <Warning> ConfigProcessor: Include not found: networks
2017.04.24 09:30:03.783121 [ 1 ] <Warning> ConfigProcessor: Include not found: networks
2017.04.24 09:30:03.783472 [ 1 ] <Information> Application: Loading metadata.
2017.04.24 09:30:03.783610 [ 1 ] <Information> DatabaseOrdinary (default): Total 0 tables.
2017.04.24 09:30:03.783734 [ 1 ] <Debug> Application: Loaded metadata.
2017.04.24 09:30:03.783848 [ 1 ] <Information> DatabaseOrdinary (system): Total 0 tables.
2017.04.24 09:30:03.784376 [ 1 ] <Information> Application: Listening http://[::1]:8123
2017.04.24 09:30:03.784420 [ 1 ] <Information> Application: Listening tcp: [::1]:9000
2017.04.24 09:30:03.784448 [ 1 ] <Information> Application: Listening interserver: [::1]:9009
2017.04.24 09:30:03.784473 [ 1 ] <Information> Application: Listening http://127.0.0.1:8123
2017.04.24 09:30:03.784491 [ 1 ] <Information> Application: Listening tcp: 127.0.0.1:9000
2017.04.24 09:30:03.784507 [ 1 ] <Information> Application: Listening interserver: 127.0.0.1:9009
2017.04.24 09:30:03.784621 [ 1 ] <Information> Application: Ready for connections.
2017.04.24 09:30:05.801608 [ 2 ] <Debug> ConfigReloader: Loading config `/etc/clickhouse-server/config.xml'
2017.04.24 09:30:05.803274 [ 2 ] <Warning> ConfigProcessor: Include not found: clickhouse_remote_servers
2017.04.24 09:30:05.803348 [ 2 ] <Warning> ConfigProcessor: Include not found: clickhouse_compression
root@GlonHo:~# cat /var/log/clickhouse-server/stderr
Should logs to /var/log/clickhouse-server/clickhouse-server.log
Should error logs to /var/log/clickhouse-server/clickhouse-server.err.log
root@GlonHo:~# clickhouse-client
ClickHouse client version 1.1.54198.
Connecting to localhost:9000.
Connected to ClickHouse server version 1.1.54198.
:)
:) select 1
SELECT 1
┌─1─┐
│ 1 │
└───┘
1 rows in set. Elapsed: 0.023 sec. 
:)
:) select now()
SELECT now()
┌───────────────now()─┐
│ 2017-04-24 09:37:31 │
└─────────────────────┘
1 rows in set. Elapsed: 0.005 sec. 
:)
:) Bye. (CTRL + d 退出客户端)
root@GlonHo:~# service clickhouse-server stop
Stop clickhouse-server service: DONE

日志变化：

root@GlonHo:~# tail -f /var/log/clickhouse-server/clickhouse-server.log
2017.04.24 09:36:59.286669 [ 3 ] <Trace> TCPConnectionFactory: TCP Request. Address: 127.0.0.1:36942
2017.04.24 09:36:59.288258 [ 3 ] <Debug> TCPHandler: Connected ClickHouse client version 1.1.54198, user: default.
2017.04.24 09:37:15.669268 [ 3 ] <Debug> executeQuery: (from 127.0.0.1:36942) select 1
2017.04.24 09:37:15.678877 [ 3 ] <Trace> InterpreterSelectQuery: FetchColumns -> Complete
2017.04.24 09:37:15.679000 [ 3 ] <Debug> executeQuery: Query pipeline:
Expression
 Expression
  One
2017.04.24 09:37:15.679459 [ 3 ] <Information> executeQuery: Read 1 rows, 1.00 B in 0.010 sec., 98 rows/sec., 98.89 B/sec.
2017.04.24 09:37:15.679521 [ 3 ] <Debug> MemoryTracker: Peak memory usage (for query): 1.00 MiB.
2017.04.24 09:37:15.679541 [ 3 ] <Debug> MemoryTracker: Peak memory usage (for user): 1.00 MiB.
2017.04.24 09:37:15.679548 [ 3 ] <Debug> MemoryTracker: Peak memory usage (total): 1.00 MiB.
2017.04.24 09:37:15.679559 [ 3 ] <Information> TCPHandler: Processed in 0.011 sec.
2017.04.24 09:37:31.497405 [ 3 ] <Debug> executeQuery: (from 127.0.0.1:36942) select now()
2017.04.24 09:37:31.497653 [ 3 ] <Trace> InterpreterSelectQuery: FetchColumns -> Complete
2017.04.24 09:37:31.497976 [ 3 ] <Debug> executeQuery: Query pipeline:
Expression
 Expression
  One
2017.04.24 09:37:31.500776 [ 3 ] <Information> executeQuery: Read 1 rows, 1.00 B in 0.003 sec., 313 rows/sec., 313.78 B/sec.
2017.04.24 09:37:31.500856 [ 3 ] <Debug> MemoryTracker: Peak memory usage (for query): 1.00 MiB.
2017.04.24 09:37:31.500872 [ 3 ] <Debug> MemoryTracker: Peak memory usage (for user): 1.00 MiB.
2017.04.24 09:37:31.500880 [ 3 ] <Debug> MemoryTracker: Peak memory usage (total): 1.00 MiB.
2017.04.24 09:37:31.500893 [ 3 ] <Information> TCPHandler: Processed in 0.004 sec.
2017.04.24 10:04:11.313863 [ 3 ] <Information> TCPHandler: Done processing connection.
2017.04.24 10:04:36.359834 [ 4 ] <Information> Application: Received termination signal (Terminated)
2017.04.24 10:04:36.359978 [ 1 ] <Debug> Application: Received termination signal.
2017.04.24 10:04:36.360021 [ 1 ] <Debug> Application: Waiting for current connections to close.
2017.04.24 10:04:37.000043 [ 1 ] <Debug> Application: Closed all connections.
2017.04.24 10:04:37.004456 [ 1 ] <Information> Application: Shutting down storages.
2017.04.24 10:04:37.005499 [ 1 ] <Debug> Application: Shutted down storages.
2017.04.24 10:04:37.010125 [ 1 ] <Debug> Application: Destroyed global context.
2017.04.24 10:04:37.010483 [ 1 ] <Information> Application: shutting down
2017.04.24 10:04:37.011206 [ 1 ] <Debug> Application: Uninitializing subsystem: Logging Subsystem
2017.04.24 10:04:37.011572 [ 4 ] <Information> BaseDaemon: Stop SignalListener thread

参考：

https://clickhouse.yandex/

https://github.com/redsoftbiz/clickhouse-rpm