[TOC]

概述

新安装的greenplum集群只有primary节点，没有mirror。高可用性没得到保证。所以就需要为集群添加mirror节点

注意：数据量过大时添加mirror，会有较大的磁盘压力，因为后台会一直同步数据，这一点线上系统需要注意

添加前情况

初始化的时候只有primary

20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-Greenplum Primary Segment Configuration
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:----------------------------------------
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw1     /data/primary/gpseg0     40000     2     0
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw1     /data/primary/gpseg1     40001     3     1
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw1     /data/primary/gpseg2     40002     4     2
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw1     /data/primary/gpseg3     40003     5     3
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw2     /data/primary/gpseg4     40000     6     4
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw2     /data/primary/gpseg5     40001     7     5
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw2     /data/primary/gpseg6     40002     8     6
20190326:00:48:33:005423 gpinitsystem:gw_mdw1:gpadmin-[INFO]:-gw_sdw2     /data/primary/gpseg7     40003     9     7
Continue with Greenplum creation Yy/Nn>

查看系统配置表，发现只有primary节点

postgres=# SELECT * from gp_segment_configuration ;dbid | content | role | preferred_role | mode | status | port  | hostname | address | replication_port | san_mounts
------+---------+------+----------------+------+--------+-------+----------+---------+------------------+------------1 |      -1 | p    | p              | s    | u      |  5432 | gw_mdw1  | gw_mdw1 |                  | 2 |       0 | p    | p              | s    | u      | 40000 | gw_sdw1  | gw_sdw1 |                  | 6 |       4 | p    | p              | s    | u      | 40000 | gw_sdw2  | gw_sdw2 |                  | 3 |       1 | p    | p              | s    | u      | 40001 | gw_sdw1  | gw_sdw1 |                  | 7 |       5 | p    | p              | s    | u      | 40001 | gw_sdw2  | gw_sdw2 |                  | 4 |       2 | p    | p              | s    | u      | 40002 | gw_sdw1  | gw_sdw1 |                  | 8 |       6 | p    | p              | s    | u      | 40002 | gw_sdw2  | gw_sdw2 |                  | 5 |       3 | p    | p              | s    | u      | 40003 | gw_sdw1  | gw_sdw1 |                  | 9 |       7 | p    | p              | s    | u      | 40003 | gw_sdw2  | gw_sdw2 |                  |
(9 rows)

添加步骤

在所有需要添加mirror的主机，创建存放mirror的数据目录

可以使用gpssh命令

gpssh -f seg_hosts -e 'mkdir -p /data/mirror'

生成addmirror文件

执行gpaddmirrors 命令，键入存放mirror节点的日志，生成配置文件

[gpadmin@gw_mdw1 ~]$ gpaddmirrors -o ./addmirror
20190326:00:56:21:030831 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-Starting gpaddmirrors with args: -o ./addmirror
20190326:00:56:21:030831 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 4.3.1.0 build 6'
20190326:00:56:21:030831 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-master Greenplum Version: 'PostgreSQL 8.2.15 (Greenplum Database 4.3.1.0 build 6) on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.4.2 compiled on Jun 11 2014 17:23:40'
20190326:00:56:21:030831 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-Obtaining Segment details from master...
Enter mirror segment data directory location 1 of 4 >
/data/mirror
Enter mirror segment data directory location 2 of 4 >
/data/mirror
Enter mirror segment data directory location 3 of 4 >
/data/mirror
Enter mirror segment data directory location 4 of 4 >
/data/mirror
20190326:00:57:15:030831 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-Configuration file output to ./addmirror successfully.

查看文件内容如下

[gpadmin@gw_mdw1 ~]$ cat addmirror
filespaceOrder=
mirror0=0:gw_sdw2:41000:42000:43000:/data/mirror/gpseg0
mirror1=1:gw_sdw2:41001:42001:43001:/data/mirror/gpseg1
mirror2=2:gw_sdw2:41002:42002:43002:/data/mirror/gpseg2
mirror3=3:gw_sdw2:41003:42003:43003:/data/mirror/gpseg3
mirror4=4:gw_sdw1:41000:42000:43000:/data/mirror/gpseg4
mirror5=5:gw_sdw1:41001:42001:43001:/data/mirror/gpseg5
mirror6=6:gw_sdw1:41002:42002:43002:/data/mirror/gpseg6
mirror7=7:gw_sdw1:41003:42003:43003:/data/mirror/gpseg7

执行添加命令

[gpadmin@gw_mdw1 ~]$ gpaddmirrors -i addmirror
20190326:01:08:45:031106 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-Starting gpaddmirrors with args: -i addmirror
20190326:01:08:45:031106 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 4.3.1.0 build 6'
20190326:01:08:45:031106 gpaddmirrors:gw_mdw1:gpadmin-[INFO]:-master Greenplum Version: 'PostgreSQL 8.2.15 (Greenplum Database 4.3.1.0 build 6) on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.4.2 compiled on Jun 11 2014 17:23:40'

命令没有报错，查看mirror节点的情况

使用gpstate -m查看，发现所有的mirror正在同步数据，因为我的集群新建，很快就同步完成了，此时再执行gpstate -m就可以看到Data Status的状态是Synchronized（已同步的）

[gpadmin@gw_mdw1 ~]$ gpstate -m
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-Starting gpstate with args: -m
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 4.3.1.0 build 6'
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-master Greenplum Version: 'PostgreSQL 8.2.15 (Greenplum Database 4.3.1.0 build 6) on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.4.2 compiled on Jun 11 2014 17:23:40'
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-Obtaining Segment details from master...
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:--------------------------------------------------------------
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:--Current GPDB mirror list and status
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:--Type = Group
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:--------------------------------------------------------------
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   Mirror    Datadir               Port    Status    Data Status
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw2   /data/mirror/gpseg0   41000   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw2   /data/mirror/gpseg1   41001   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw2   /data/mirror/gpseg2   41002   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw2   /data/mirror/gpseg3   41003   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw1   /data/mirror/gpseg4   41000   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw1   /data/mirror/gpseg5   41001   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw1   /data/mirror/gpseg6   41002   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:-   gw_sdw1   /data/mirror/gpseg7   41003   Passive   Resynchronizing
20190326:01:09:51:031359 gpstate:gw_mdw1:gpadmin-[INFO]:--------------------------------------------------------------

查看节点状态

发现所有的mirror已经启动

postgres=# SELECT * from gp_segment_configuration ;dbid | content | role | preferred_role | mode | status | port  | hostname | address | replication_port | san_mounts
------+---------+------+----------------+------+--------+-------+----------+---------+------------------+------------1 |      -1 | p    | p              | s    | u      |  5432 | gw_mdw1  | gw_mdw1 |                  | 2 |       0 | p    | p              | s    | u      | 40000 | gw_sdw1  | gw_sdw1 |            43000 | 10 |       0 | m    | m              | s    | u      | 41000 | gw_sdw2  | gw_sdw2 |            42000 | 3 |       1 | p    | p              | s    | u      | 40001 | gw_sdw1  | gw_sdw1 |            43001 | 11 |       1 | m    | m              | s    | u      | 41001 | gw_sdw2  | gw_sdw2 |            42001 | 4 |       2 | p    | p              | s    | u      | 40002 | gw_sdw1  | gw_sdw1 |            43002 | 12 |       2 | m    | m              | s    | u      | 41002 | gw_sdw2  | gw_sdw2 |            42002 | 5 |       3 | p    | p              | s    | u      | 40003 | gw_sdw1  | gw_sdw1 |            43003 | 13 |       3 | m    | m              | s    | u      | 41003 | gw_sdw2  | gw_sdw2 |            42003 | 6 |       4 | p    | p              | s    | u      | 40000 | gw_sdw2  | gw_sdw2 |            43000 | 14 |       4 | m    | m              | s    | u      | 41000 | gw_sdw1  | gw_sdw1 |            42000 | 7 |       5 | p    | p              | s    | u      | 40001 | gw_sdw2  | gw_sdw2 |            43001 | 15 |       5 | m    | m              | s    | u      | 41001 | gw_sdw1  | gw_sdw1 |            42001 | 8 |       6 | p    | p              | s    | u      | 40002 | gw_sdw2  | gw_sdw2 |            43002 | 16 |       6 | m    | m              | s    | u      | 41002 | gw_sdw1  | gw_sdw1 |            42002 | 9 |       7 | p    | p              | s    | u      | 40003 | gw_sdw2  | gw_sdw2 |            43003 | 17 |       7 | m    | m              | s    | u      | 41003 | gw_sdw1  | gw_sdw1 |            42003 |
(17 rows)

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