[TOC]

概述

新安裝的greenplum集群只有primary節點，沒有mirror。高可用性沒得到保證。所以就需要為集群添加mirror節點

注意：數據量過大時添加mirror，會有較大的磁盤壓力，因為后臺會一直同步數據，這一點線上系統需要注意

添加前情況

初始化的時候只有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>

查看系統配置表，發現只有primary節點

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)

添加步驟

在所有需要添加mirror的主機，創建存放mirror的數據目錄

可以使用gpssh命令

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

生成addmirror文件

執行gpaddmirrors 命令，鍵入存放mirror節點的日志，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.

查看文件內容如下

[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

執行添加命令

[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'

命令沒有報錯，查看mirror節點的情況

使用gpstate -m查看，發現所有的mirror正在同步數據，因為我的集群新建，很快就同步完成了，此時再執行gpstate -m就可以看到Data Status的狀態是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]:--------------------------------------------------------------

查看節點狀態

發現所有的mirror已經啟動

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)

總結

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