pg-xl 基於 pgxc_ctl 安裝與使用

時間  2021-01-30
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原文   原文鏈接

os: centos 7.4
pgxl:pg.version ‘10.3 (Postgres-XL 10alpha2)html

pgxl 是一款很是實用的橫向擴展的開源軟件，繼承了不少pgxc的功能，在replication 和sharding 方面有着很是棒的用處。
pgxl 不嚴格的說是 pgxc的升級增強版。是對官方 postgresql 的版本的修改提高，爲大牛點贊。node

Global Transaction Monitor (GTM)
全局事務管理器，確保羣集範圍內的事務一致性。 GTM負責發放事務ID和快照做爲其多版本併發控制的一部分。
集羣可選地配置一個備用GTM，以改進可用性。此外，能夠在協調器間配置代理GTM， 可用於改善可擴展性，減小GTM的通訊量。python

GTM Standby
GTM的備節點，在pgxc,pgxl中，GTM控制全部的全局事務分配，若是出現問題，就會致使整個集羣不可用，爲了增長可用性，增長該備用節點。當GTM出現問題時，GTM Standby能夠升級爲GTM，保證集羣正常工做。linux

GTM-Proxy
GTM須要與全部的Coordinators通訊，爲了下降壓力，能夠在每一個Coordinator機器上部署一個GTM-Proxy。c++

Coordinator
協調員管理用戶會話，並與GTM和數據節點進行交互。協調員解析，並計劃查詢，並給語句中的每個組件發送下一個序列化的全局性計劃。
爲節省機器，一般此服務和數據節點部署在一塊兒。git

Data Node
數據節點是數據實際存儲的地方。數據的分佈能夠由DBA來配置。爲了提升可用性，能夠配置數據節點的熱備以便進行故障轉移準備。github

總結：
gtm是負責ACID的，保證分佈式數據庫全局事務一致性。得益於此，就算數據節點是分佈的，可是你在主節點操做增刪改查事務時，就如同只操做一個數據庫同樣簡單。
Coordinator是調度的，將操做指令發送到各個數據節點。
datanodes是數據節點，分佈式存儲數據。web

規劃以下：
node1 192.168.56.101 gtmsql

node2 192.168.56.102 gtm-proxy,coordinator,datanode
node3 192.168.56.103 gtm-proxy,coordinator,datanode數據庫

下載

https://www.postgres-xl.org/download/

https://git.postgresql.org/gitweb/?p=postgres-xl.git;a=summary
git://git.postgresql.org/git/postgres-xl.git

安裝

node1 須要安裝依賴包

# yum install -y bison flex perl-ExtUtils-Embed readline-devel zlib-devel pam-devel libxml2-devel libxslt-devel openldap-devel python-devel gcc gcc-c++ openssl-devel cmake openjade docbook-style-dsssl uuid uuid-devel

node1 節點上關閉防火牆，selinux

# systemctl stop firewalld.service 
# systemctl disable firewalld.service 
# vim /etc/selinux/config
disabled

node1 節點上建立用戶

# groupadd postgres
# useradd postgres -g postgres 
# passwd postgres

# mkdir -p /usr/pgxl-10
# chown -R postgres:postgres /usr/pgxl-10

# mkdir -p /var/lib/pgxl
# cd /var/lib/pgxl
# mkdir {gtm,gtm_slave,pgxc_ctl}
# chown -R postgres:postgres /var/lib/pgxl

node1 節點 postgres 用戶的環境變量

# su - postgres
$ vi ~/.bash_profile
export PGUSER=postgres
export PGHOME=/usr/pgxl-10
export PGXC_CTL_HOME=/var/lib/pgxl/pgxc_ctl

export LD_LIBRARY_PATH=$PGHOME/lib
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/lib:/usr/lib:/usr/local/lib
export PATH=$PGHOME/bin:$PATH

export TEMP=/tmp
export TMPDIR=/tmp

export PS1="\[\e[32;1m\][\u@\h \W]$>\[\e[0m\]"

node1 上編譯安裝

$ cd /tmp
$ git clone git://git.postgresql.org/git/postgres-xl.git
$ cd postgres-xl
$ git branch -r
  origin/HEAD -> origin/master
  origin/XL9_5_STABLE
  origin/XL_10_STABLE
  origin/master
  origin/xl_dbt3_expt
  origin/xl_doc_update
  origin/xl_test
$ git checkout XL_10_STABLE
Branch XL_10_STABLE set up to track remote branch XL_10_STABLE from origin.
Switched to a new branch 'XL_10_STABLE'
$ git status
# On branch XL_10_STABLE
nothing to commit, working directory clean  
$ ./configure --prefix=/usr/pgxl-10 --with-perl --with-python --with-openssl --with-pam --with-ldap --with-libxml --with-libxslt
$ make 
$ make install

$ cd contrib
$ make 
$ make install

以上操做除了 mkdir {gtm,gtm_slave,pgxc_ctl} 命令外，都須要在 node二、node3 上執行。

另外在 node二、node3節點上還須要運行以下命令

# su - postgres
$ cd /var/lib/pgxl
$ mkdir {gtm_proxy}
$ mkdir {coord,coord_slave,coord_archlog}
$ mkdir {dn_master,dn_slave,dn_archlog}

node一、node二、node3配置ssh相互免密登陸

過程略

node一、node二、node3同步下時間

# ntpdate asia.pool.ntp.org

pgxc_ctl 生成配置文件

$ which pgxc_ctl
/usr/pgxl-10/bin/pgxc_ctl

$ pgxc_ctl prepare
/bin/bash
Installing pgxc_ctl_bash script as /var/lib/pgxl/pgxc_ctl/pgxc_ctl_bash.
ERROR: File "/var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf" not found or not a regular file. No such file or directory
Installing pgxc_ctl_bash script as /var/lib/pgxl/pgxc_ctl/pgxc_ctl_bash.
Reading configuration using /var/lib/pgxl/pgxc_ctl/pgxc_ctl_bash --home /var/lib/pgxl/pgxc_ctl --configuration /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf
Finished reading configuration.
   ******** PGXC_CTL START ***************

Current directory: /var/lib/pgxl/pgxc_ctl

$ ls -l /var/lib/pgxl/pgxc_ctl
total 24
-rw-r--r-- 1 postgres postgres   246 Jul 18 16:42 coordExtraConfig
-rw-r--r-- 1 postgres postgres 17815 Jul 18 16:42 pgxc_ctl.conf

pgxc_ctl 修改配置文件

$ vi /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf

pgxcInstallDir=/usr/pgxl-10

#---- OVERALL 
pgxcOwner=postgres
pgxcUser=$pgxcOwner
tmpDir=/tmp
localTmpDir=$tmpDir

#---- GTM
#---- GTM Master
#---- Overall
gtmName=node1_gtm
gtmMasterServer=node1
gtmMasterPort=6666
gtmMasterDir=/var/lib/pgxl/gtm
#---- Configuration
gtmExtraConfig=none
gtmMasterSpecificExtraConfig=none

#---- GTM Slave
#---- Overall
gtmSlave=y
gtmSlaveName=node1_gtm_slave
gtmSlaveServer=node1
gtmSlavePort=6667
gtmSlaveDir=/var/lib/pgxl/gtm_slave
#---- Configuration
gtmSlaveSpecificExtraConfig=none

#---- GTM Proxy
#---- Shortcuts
gtmProxyDir=/var/lib/pgxl/gtm_proxy
#---- Overall
gtmProxy=y
gtmProxyNames=(gtm_proxy1 gtm_proxy2)
gtmProxyServers=(node2 node3)
gtmProxyPorts=(6668 6668)
gtmProxyDirs=($gtmProxyDir $gtmProxyDir)
#---- Configuration
gtmPxyExtraConfig=none
gtmPxySpecificExtraConfig=(none none)

#---- Coordinators
#---- shortcuts
coordMasterDir=/var/lib/pgxl/coord
coordSlaveDir=/var/lib/pgxl/coord_slave
coordArchLogDir=/var/lib/pgxl/coord_archlog
#---- Overall
coordNames=(coord1 coord2)
coordPorts=(20004 20005)
poolerPorts=(20010 20011)
coordPgHbaEntries=(192.168.56.0/24)

#---- Master -------------
coordMasterServers=(node2 node3)
coordMasterDirs=($coordMasterDir $coordMasterDir)
coordMaxWALsernder=10
coordMaxWALSenders=($coordMaxWALsernder $coordMaxWALsernder)
#---- Slave -------------
coordSlave=y
coordSlaveSync=y
coordSlaveServers=(node3 node2) 
coordSlavePorts=(20004 20005)           # Master ports
coordSlavePoolerPorts=(20010 20011)         # Master pooler ports
coordSlaveDirs=($coordSlaveDir $coordSlaveDir)
coordArchLogDirs=($coordArchLogDir $coordArchLogDir)
#---- Configuration files
coordExtraConfig=coordExtraConfig
cat > $coordExtraConfig <<EOF
#================================================
# Added to all the coordinator postgresql.conf
# Original: $coordExtraConfig
log_destination = 'csvlog'
logging_collector = on
log_directory = 'pg_log'
listen_addresses = '*'
max_connections = 100
EOF

coordSpecificExtraConfig=(none none)
coordExtraPgHba=none
coordSpecificExtraPgHba=(none none)


#---- Datanodes
#---- Shortcuts
datanodeMasterDir=/var/lib/pgxl/dn_master
datanodeSlaveDir=/var/lib/pgxl/dn_slave
datanodeArchLogDir=/var/lib/pgxl/dn_archlog
#---- Overall
primaryDatanode=node2
datanodeNames=(datanode1 datanode2)
datanodePorts=(20008 20009) 
datanodePoolerPorts=(20012 20013)
datanodePgHbaEntries=(192.168.56.0/24)
#---- Master
datanodeMasterServers=(node2 node3)     
datanodeMasterDirs=($datanodeMasterDir $datanodeMasterDir)
datanodeMaxWalSender=10
datanodeMaxWALSenders=($datanodeMaxWalSender $datanodeMaxWalSender)
#---- Slave
datanodeSlave=y
datanodeSlaveServers=(node3 node2)
datanodeSlavePorts=(20008 20009)
datanodeSlavePoolerPorts=(20012 20013)
datanodeSlaveSync=y 
datanodeSlaveDirs=($datanodeSlaveDir $datanodeSlaveDir)
datanodeArchLogDirs=( $datanodeArchLogDir $datanodeArchLogDir)
# ---- Configuration files
datanodeExtraConfig=none
datanodeSpecificExtraConfig=(none none)
datanodeExtraPgHba=none
datanodeSpecificExtraPgHba=(none none)
#----- Additional Slaves
datanodeAdditionalSlaves=n
#---- WAL archives
walArchive=y

pgxc_ctl 的一些操做

在 node1 節點上操做
初始化集羣

$ pgxc_ctl -c /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf init all

啓動集羣

$ pgxc_ctl -c /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf start all

關閉集羣

$ pgxc_ctl -c /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf stop all

中間有一些錯誤，記錄一下。當init時提示一些命令沒有發現。

Current directory: /var/lib/pgxl/pgxc_ctl
Initialize GTM master
ERROR: target directory (/var/lib/pgxl/gtm) exists and not empty. Skip GTM initilialization
bash: gtm: command not found
bash: gtm_ctl: command not found
Done.
Start GTM master
bash: gtm_ctl: command not found
Initialize GTM slave
bash: initgtm: command not found

原來是 ~/.bashrc 出的問題
node1,node2,node3 每一個節點都建立一個

$ vi ~/.bashrc

export PGUSER=postgres
export PGHOME=/usr/pgxl-10
export PGXC_CTL_HOME=/var/lib/pgxl/pgxc_ctl

export LD_LIBRARY_PATH=$PGHOME/lib
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/lib:/usr/lib:/usr/local/lib
export PATH=$PGHOME/bin:$PATH

export TEMP=/tmp
export TMPDIR=/tmp

export PS1="\[\e[32;1m\][\u@\h \W]$>\[\e[0m\]"

驗證

登陸 node2節點的 coordinator，發現都不用再手動 create node

$ psql -p 20004
psql (PGXL 10alpha2, based on PG 10.3 (Postgres-XL 10alpha2))
Type "help" for help.

postgres=# 
postgres=# select * from pgxc_node;
 node_name | node_type | node_port | node_host | nodeis_primary | nodeis_preferred | node_id 
-----------+-----------+-----------+-----------+----------------+------------------+-------------
 coord1    | C | 20004 | node2 | f | f | 1885696643
 coord2    | C | 20005 | node3 | f | f | -1197102633
 datanode1 | D | 20008 | node2 | t | t | -927910690
 datanode2 | D | 20009 | node3 | f | f | 914546798
(4 rows)

再登陸下 node3節點的 coordinator。

$ psql -p 20005
psql (PGXL 10alpha2, based on PG 10.3 (Postgres-XL 10alpha2))
Type "help" for help.

postgres=# select * from pgxc_node;
 node_name | node_type | node_port | node_host | nodeis_primary | nodeis_preferred | node_id 
-----------+-----------+-----------+-----------+----------------+------------------+-------------
 coord1    | C | 20004 | node2 | f | f | 1885696643
 coord2    | C | 20005 | node3 | f | f | -1197102633
 datanode1 | D | 20008 | node2 | t | f | -927910690
 datanode2 | D | 20009 | node3 | f | t | 914546798
(4 rows)

在任意一個coordinator執行以下操做

postgres=# create database peiybdb;
postgres=# \c peiybdb
peiybdb=# create table tmp_t0(c0 varchar(100),c1 varchar(100));
peiybdb=# insert into tmp_t0(c0,c1) SELECT id::varchar,md5(id::varchar) FROM generate_series(1,10000) as id;
INSERT 0 10000 peiybdb=# select xc_node_id,count(1) from tmp_t0 group by xc_node_id;
 xc_node_id | count 
------------+-------
 -927910690 |  5081
  914546798 |  4919
(2 rows)

very very good。

參考：
https://www.postgres-xl.org/documentation/
https://www.postgres-xl.org/documentation/runtime.html
https://www.postgres-xl.org/documentation/runtime-config.html
https://www.postgres-xl.org/documentation/pgxc-ctl.html
https://gist.github.com/ewiger/a71689db37fec5c93a9920621f52b2cf

https://sourceforge.net/p/postgres-xl/tickets/74/
https://sourceforge.net/p/postgres-xl/tickets/77/

https://www.postgres-xl.org/
https://www.postgres-xl.org/overview/
https://www.postgres-xl.org/download/

https://git.postgresql.org/gitweb/?p=postgres-xl.git;a=summary

https://www.2ndquadrant.com/en/resources/postgres-xl/

https://www.postgresql.org/download

下面是 pgxc_ctl -c /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf init all 的輸出日誌，記錄一下

$ pgxc_ctl -c /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf init all
/bin/bash
Installing pgxc_ctl_bash script as /var/lib/pgxl/pgxc_ctl/pgxc_ctl_bash.
Installing pgxc_ctl_bash script as /var/lib/pgxl/pgxc_ctl/pgxc_ctl_bash.
Reading configuration using /var/lib/pgxl/pgxc_ctl/pgxc_ctl_bash --home /var/lib/pgxl/pgxc_ctl --configuration /var/lib/pgxl/pgxc_ctl/pgxc_ctl.conf
Finished reading configuration.
   ******** PGXC_CTL START ***************

Current directory: /var/lib/pgxl/pgxc_ctl
Initialize GTM master
The files belonging to this GTM system will be owned by user "postgres".
This user must also own the server process.


fixing permissions on existing directory /var/lib/pgxl/gtm ... ok
creating configuration files ... ok
creating control file ... ok

Success.
waiting for server to shut down.... done
server stopped
Done.
Start GTM master
server starting
Initialize GTM slave
The files belonging to this GTM system will be owned by user "postgres".
This user must also own the server process.


fixing permissions on existing directory /var/lib/pgxl/gtm_slave ... ok
creating configuration files ... ok
creating control file ... ok

Success.
Done.
Start GTM slaveserver starting
Done.
Initialize all the gtm proxies.
Initializing gtm proxy gtm_proxy1.
Initializing gtm proxy gtm_proxy2.
The files belonging to this GTM system will be owned by user "postgres".
This user must also own the server process.


fixing permissions on existing directory /var/lib/pgxl/gtm_proxy ... ok
creating configuration files ... ok

Success.
The files belonging to this GTM system will be owned by user "postgres".
This user must also own the server process.


fixing permissions on existing directory /var/lib/pgxl/gtm_proxy ... ok
creating configuration files ... ok

Success.
Done.
Starting all the gtm proxies.
Starting gtm proxy gtm_proxy1.
Starting gtm proxy gtm_proxy2.
server starting
server starting
Done.
Initialize all the coordinator masters.
Initialize coordinator master coord1.
Initialize coordinator master coord2.
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/pgxl/coord ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... creating cluster information ... ok
syncing data to disk ... ok
freezing database template0 ... ok
freezing database template1 ... ok
freezing database postgres ... ok

WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success.
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/pgxl/coord ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... creating cluster information ... ok
syncing data to disk ... ok
freezing database template0 ... ok
freezing database template1 ... ok
freezing database postgres ... ok

WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success.
Done.
Starting coordinator master.
Starting coordinator master coord1
Starting coordinator master coord2
2018-07-18 19:40:20.825 CST [17289] LOG:  listening on IPv4 address "0.0.0.0", port 20004
2018-07-18 19:40:20.825 CST [17289] LOG:  listening on IPv6 address "::", port 20004
2018-07-18 19:40:20.829 CST [17289] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20004"
2018-07-18 19:40:20.840 CST [17289] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:20.840 CST [17289] HINT:  Future log output will appear in directory "pg_log".
2018-07-18 19:40:20.077 CST [16992] LOG:  listening on IPv4 address "0.0.0.0", port 20005
2018-07-18 19:40:20.077 CST [16992] LOG:  listening on IPv6 address "::", port 20005
2018-07-18 19:40:20.080 CST [16992] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20005"
2018-07-18 19:40:20.090 CST [16992] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:20.090 CST [16992] HINT:  Future log output will appear in directory "pg_log".
Done.
Initialize all the coordinator slaves.
Initialize the coordinator slave coord1.
Initialize the coordinator slave coord2.
Done.
Starting all the coordinator slaves.
Starting coordinator slave coord1.
Starting coordinator slave coord2.
2018-07-18 19:40:29.552 CST [17176] LOG:  listening on IPv4 address "0.0.0.0", port 20004
2018-07-18 19:40:29.552 CST [17176] LOG:  listening on IPv6 address "::", port 20004
2018-07-18 19:40:29.556 CST [17176] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20004"
2018-07-18 19:40:29.577 CST [17176] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:29.577 CST [17176] HINT:  Future log output will appear in directory "pg_log".
2018-07-18 19:40:30.353 CST [17450] LOG:  listening on IPv4 address "0.0.0.0", port 20005
2018-07-18 19:40:30.353 CST [17450] LOG:  listening on IPv6 address "::", port 20005
2018-07-18 19:40:30.369 CST [17450] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20005"
2018-07-18 19:40:30.382 CST [17450] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:30.382 CST [17450] HINT:  Future log output will appear in directory "pg_log".
Done
Initialize all the datanode masters.
Initialize the datanode master node2.
Initialize the datanode master node3.
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/pgxl/dn_master ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... creating cluster information ... ok
syncing data to disk ... ok
freezing database template0 ... ok
freezing database template1 ... ok
freezing database postgres ... ok

WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success.
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.

The database cluster will be initialized with locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".

Data page checksums are disabled.

fixing permissions on existing directory /var/lib/pgxl/dn_master ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... creating cluster information ... ok
syncing data to disk ... ok
freezing database template0 ... ok
freezing database template1 ... ok
freezing database postgres ... ok

WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.

Success.
Done.
Starting all the datanode masters.
Starting datanode master node2.
Starting datanode master node3.
2018-07-18 19:40:41.642 CST [17662] LOG:  listening on IPv4 address "0.0.0.0", port 20008
2018-07-18 19:40:41.642 CST [17662] LOG:  listening on IPv6 address "::", port 20008
2018-07-18 19:40:41.648 CST [17662] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20008"
2018-07-18 19:40:41.656 CST [17662] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:41.656 CST [17662] HINT:  Future log output will appear in directory "pg_log".
2018-07-18 19:40:40.918 CST [17389] LOG:  listening on IPv4 address "0.0.0.0", port 20009
2018-07-18 19:40:40.918 CST [17389] LOG:  listening on IPv6 address "::", port 20009
2018-07-18 19:40:40.921 CST [17389] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20009"
2018-07-18 19:40:40.929 CST [17389] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:40.929 CST [17389] HINT:  Future log output will appear in directory "pg_log".
Done.
Initialize all the datanode slaves.
Initialize datanode slave node2
Initialize datanode slave node3
Starting all the datanode slaves.
Starting datanode slave node2.
Starting datanode slave node3.
2018-07-18 19:40:49.702 CST [17550] LOG:  listening on IPv4 address "0.0.0.0", port 20008
2018-07-18 19:40:49.702 CST [17550] LOG:  listening on IPv6 address "::", port 20008
2018-07-18 19:40:49.712 CST [17550] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20008"
2018-07-18 19:40:49.725 CST [17550] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:49.725 CST [17550] HINT:  Future log output will appear in directory "pg_log".
2018-07-18 19:40:50.462 CST [17823] LOG:  listening on IPv4 address "0.0.0.0", port 20009
2018-07-18 19:40:50.462 CST [17823] LOG:  listening on IPv6 address "::", port 20009
2018-07-18 19:40:50.471 CST [17823] LOG:  listening on Unix socket "/tmp/.s.PGSQL.20009"
2018-07-18 19:40:50.483 CST [17823] LOG:  redirecting log output to logging collector process
2018-07-18 19:40:50.483 CST [17823] HINT:  Future log output will appear in directory "pg_log".
Done.
ALTER NODE coord1 WITH (HOST='node2', PORT=20004);
ALTER NODE
CREATE NODE coord2 WITH (TYPE='coordinator', HOST='node3', PORT=20005);
CREATE NODE
CREATE NODE node2 WITH (TYPE='datanode', HOST='node2', PORT=20008, PRIMARY, PREFERRED);
CREATE NODE
CREATE NODE node3 WITH (TYPE='datanode', HOST='node3', PORT=20009);
CREATE NODE
SELECT pgxc_pool_reload();
 pgxc_pool_reload 
------------------
 t
(1 row)

CREATE NODE coord1 WITH (TYPE='coordinator', HOST='node2', PORT=20004);
CREATE NODE
ALTER NODE coord2 WITH (HOST='node3', PORT=20005);
ALTER NODE
CREATE NODE node2 WITH (TYPE='datanode', HOST='node2', PORT=20008, PRIMARY);
CREATE NODE
CREATE NODE node3 WITH (TYPE='datanode', HOST='node3', PORT=20009, PREFERRED);
CREATE NODE
SELECT pgxc_pool_reload();
 pgxc_pool_reload 
------------------
 t
(1 row)

Done.
EXECUTE DIRECT ON (node2) 'CREATE NODE coord1 WITH (TYPE=''coordinator'', HOST=''node2'', PORT=20004)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node2) 'CREATE NODE coord2 WITH (TYPE=''coordinator'', HOST=''node3'', PORT=20005)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node2) 'ALTER NODE node2 WITH (TYPE=''datanode'', HOST=''node2'', PORT=20008, PRIMARY, PREFERRED)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node2) 'CREATE NODE node3 WITH (TYPE=''datanode'', HOST=''node3'', PORT=20009, PREFERRED)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node2) 'SELECT pgxc_pool_reload()';
 pgxc_pool_reload 
------------------
 t
(1 row)

EXECUTE DIRECT ON (node3) 'CREATE NODE coord1 WITH (TYPE=''coordinator'', HOST=''node2'', PORT=20004)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node3) 'CREATE NODE coord2 WITH (TYPE=''coordinator'', HOST=''node3'', PORT=20005)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node3) 'CREATE NODE node2 WITH (TYPE=''datanode'', HOST=''node2'', PORT=20008, PRIMARY, PREFERRED)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node3) 'ALTER NODE node3 WITH (TYPE=''datanode'', HOST=''node3'', PORT=20009, PREFERRED)';
EXECUTE DIRECT
EXECUTE DIRECT ON (node3) 'SELECT pgxc_pool_reload()';
 pgxc_pool_reload 
------------------
 t
(1 row)

Done.
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