GP叢集master伺服器掛了，需要手動將standby切換成master，讓叢集繼續對外提供服務

1、執行gpactivatestandby啟用standby

[gpadmin@gp-segment5 ~]$ gpactivatestandby -d $MASTER_DATA_DIRECTORY

-bash: gpactivatestandby: command not found

找不到gpactivatestandby命令，猜測可能是環境變數的原因

[gpadmin@gp-segment5 ~]$ cat ~/.bashrc

# .bashrc

# Source global definitions

if [ -f /etc/bashrc ]; then

. /etc/bashrc

fi

# User specific aliases and functions

果然環境變數中沒有GP的環境變數，加上變數並source生效

[gpadmin@gp-segment5 ~]$ vi ~/.bashrc

# .bashrc

# Source global definitions

if [ -f /etc/bashrc ]; then

. /etc/bashrc

fi

# User specific aliases and functions

source /disk/greenplum-db/greenplum_path.sh

export MASTER_DATA_DIRECTORY=/disk/master/gpseg-1

[gpadmin@gp-segment5 ~]$ source ~/.bashrc

再次執行 gpactivatestandby顯示PGPORT環境變數沒有指定

[gpadmin@gp-segment5 ~]$ gpactivatestandby -d $MASTER_DATA_DIRECTORY

20161230:14:42:58:023255 gpactivatestandby:gp-segment5:gpadmin-[CRITICAL]:-PGPORT environment variable not set.

增加PGPORT環境變數並source

[gpadmin@gp-segment5 gpseg-1]$ vi ~/.bashrc

export MASTER_DATA_DIRECTORY=/disk/master/gpseg-1

# .bashrc

# Source global definitions

if [ -f /etc/bashrc ]; then

. /etc/bashrc

fi

# User specific aliases and functions

source /disk/greenplum-db/greenplum_path.sh

export MASTER_DATA_DIRECTORY=/disk/master/gpseg-1

export PGPORT=5432

再次執行啟用成功

[gpadmin@gp-segment5 gpseg-1]$ gpactivatestandby -d $MASTER_DATA_DIRECTORY

20161230:14:56:03:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:------------------------------------------------------

20161230:14:56:03:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Standby data directory = /disk/master/gpseg-1

20161230:14:56:03:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Standby port = 5432

20161230:14:56:03:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Standby running = yes

20161230:14:56:03:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Force standby activation = no

20161230:14:56:03:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:------------------------------------------------------

Do you want to continue with standby master activation? Yy|Nn (default=N):

> y

20161230:14:56:09:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-found standby postmaster process

20161230:14:56:09:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Updating transaction files filespace flat files...

20161230:14:56:09:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Updating temporary files filespace flat files...

20161230:14:56:09:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Promoting standby...

20161230:14:56:09:004245 gpactivatestandby:gp-segment5:gpadmin-[DEBUG]:-Waiting for connection...

20161230:14:56:14:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Standby master is promoted

20161230:14:56:14:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Reading current configuration...

20161230:14:56:14:004245 gpactivatestandby:gp-segment5:gpadmin-[DEBUG]:-Connecting to dbname='template1'

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Writing the gp_dbid file - /disk/master/gpseg-1/gp_dbid...

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-But found an already existing file.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Hence removed that existing file.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Creating a new file...

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Wrote dbid: 1 to the file.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Now marking it as read only...

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Verifying the file...

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:------------------------------------------------------

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-The activation of the standby master has completed successfully.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-gp-segment5 is now the new primary master.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-You will need to update your user access mechanism to reflect

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-the change of master hostname.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Do not re-start the failed master while the fail-over master is

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-operational, this could result in database corruption!

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-MASTER_DATA_DIRECTORY is now /disk/master/gpseg-1 if

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-this has changed as a result of the standby master activation, remember

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-to change this in any startup scripts etc, that may be configured

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-to set this value.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-MASTER_PORT is now 5432, if this has changed, you

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-may need to make additional configuration changes to allow access

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-to the Greenplum instance.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Refer to the Administrator Guide for instructions on how to re-activate

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-the master to its previous state once it becomes available.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-Query planner statistics must be updated on all databases

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-following standby master activation.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:-When convenient, run ANALYZE against all user databases.

20161230:14:56:15:004245 gpactivatestandby:gp-segment5:gpadmin-[INFO]:------------------------------------------------------

2、檢視叢集狀態

可以看到叢集個節點都正常，只有standby的狀態變成No master standby configured

[gpadmin@gp-segment5 gpseg-1]$ gpstate

20161230:14:56:32:004859 gpstate:gp-segment5:gpadmin-[INFO]:-Starting gpstate with args:

20161230:14:56:32:004859 gpstate:gp-segment5:gpadmin-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 4.3.8.0 build 1'

20161230:14:56:32:004859 gpstate:gp-segment5:gpadmin-[INFO]:-master Greenplum Version: 'PostgreSQL 8.2.15 (Greenplum Database 4.3.8.0 build 1) on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.4.2 compiled on Mar 28 2016 00:15:29'

20161230:14:56:32:004859 gpstate:gp-segment5:gpadmin-[INFO]:-Obtaining Segment details from master...

20161230:14:56:32:004859 gpstate:gp-segment5:gpadmin-[INFO]:-Gathering data from segments...

.

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:-Greenplum instance status summary

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:-----------------------------------------------------

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Master instance = Active

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Master standby = No master standby configured

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total segment instance count from metadata = 16

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:-----------------------------------------------------

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Primary Segment Status

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:-----------------------------------------------------

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total primary segments = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total primary segment valid (at master) = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total primary segment failures (at master) = 0

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number of postmaster.pid files missing = 0

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number of postmaster.pid files found = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number of postmaster.pid PIDs missing = 0

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number of postmaster.pid PIDs found = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number of /tmp lock files missing = 0

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number of /tmp lock files found = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number postmaster processes missing = 0

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total number postmaster processes found = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:-----------------------------------------------------

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Mirror Segment Status

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:-----------------------------------------------------

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total mirror segments = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total mirror segment valid (at master) = 8

20161230:14:56:33:004859 gpstate:gp-segment5:gpadmin-[INFO]:- Total mirror segment failures (at master) = 0