Greenplum [deployment 08] database small version upgrade process and problem handling error: open-source-greenplum-db-6 conflicts with

1. Upgrade reason

• Why do you always pay attention to it Greenplum Version information for ？

The project database should be from MySQL Switch to Greenplum The biggest problem is SQL The grammar is different ,MySQL Yes on duplicate key update Implement conflict update ,Greenplum But there was no .

PostgreSQL 9.5 Introduced UPSET function , Its grammar insert on conflict do Very powerful , Support merge write （ When a unique constraint is violated , Update in case of conflict , If there is no conflict, write ）, At the same time, it supports streaming Computing .

Currently in use Greenplum The database version is 6.13.0 Its PostgreSQL Version is 9.4.24 Can't use UPSERT grammar ：

# select version(); 
PostgreSQL 9.4.24 
(Greenplum Database 6.13.0 build commit:4f1adf8e247a9685c19ea02bcaddfdc200937ecd Open Source) 
on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 6.4.0, 64-bit compiled on Dec 18 2020 22:31:16

Unfortunately 20220408 The latest version released 6.20.3 Is still 9.4

PostgreSQL 9.4.26 
(Greenplum Database 6.20.3 build commit:24b949d2585cdbe8a157062fb756013e7c2874ab Open Source) 
on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 6.4.0, 64-bit compiled on Apr  6 2022 19:59:57

Finally, it is realized by code replace insert or insert on conflict similar on duplicate key update Batch warehousing data （ Merge, insert, add and update if none ） The operation of , The code can be viewed 《Greenplum Code 01》.

PostgreSQL 9.5 The merger of seems to wait until Greenplum7.0,20220714 Released the latest version 6.21.0, Here is a database upgrade operation , Also verify the kernel version .

2. Small version upgrade process

2.1 install GPDB

# 0. First, stop the current database 
gpstop -M fast

# 1. install ( Default install to /usr/local) Under the table of contents 
yum install -y ./open-source-greenplum-db-6.21.0-rhel7-x86_64.rpm

The error report conflicts with the previous version ：

No package matched to upgrade: open-source-greenplum-db-6
--> Finished Dependency Resolution
Error: open-source-greenplum-db-6 conflicts with greenplum-db-6-6.13.0-1.el7.x86_64
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest

#  Use  rpm  install   add to  --nodeps  Indicates no dependency 
rpm -ivh open-source-greenplum-db-6.21.0-rhel7-x86_64.rpm --nodeps
#  setup script 
Preparing...                          ################################# [100%]
Updating / installing...
   1:open-source-greenplum-db-6-6.21.0################################# [100%]

# 2. Empowering  gpadmim
chown -R gpadmin:gpadmin /usr/local/greenplum*

2.2 Rebuild or modify the soft connection

#  Rebuild soft connection 
rm -rf /usr/local/greenplum-db
ln -s /usr/local/greenplum-db-6.21.0 /usr/local/greenplum-db
#  Modify the soft connection 
ln –snf /usr/local/greenplum-db-6.21.0 /usr/local/greenplum-db

2.3 Start validation

#  start-up 
gpstart -a

# select version();
PostgreSQL 9.4.26 
(Greenplum Database 6.21.0 build commit:d0087e3b24c54d203ca8bb315559205f13cd6393 Open Source) 
on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 6.4.0, 64-bit compiled on Jun 10 2022 01:57:17

Database started successfully , The version has also been upgraded to 6.21.0 Of course, the kernel version is still 9.4.26. This is a small version upgrade , The database may need to be reinitialized when upgrading a large version .