由于重复密钥冲突导致PostgreSQL数据库复制失败

Question

我已经配置了两台具有冗余配置的RHEL机器(主主安装程序)和下面的软件版本。

• 数据库: PostgreSQL 9.5
• Bucardo : Bucardo 5.4

数据库复制一直顺利进行，直到某个时候，在复制突然停止之后。我可以在布卡多日志中看到下面的一些陈述。

*KID (database_sync) Conflicts for public.interface: 4
KID (database_sync) Conflicts have been resolved
KID (database_sync) Warning! Aborting due to exception for public.interface:? Error was DBD::Pg::db pg_putcopyend failed: ERROR:  duplicate key value violates unique constraint "interface_nodeid_ifindex_unique_idx"\nDETAIL:  Key (nodeid, ifindex)=(81, 1) already exists.\nCONTEXT:  COPY interface, line 2 at /usr/share/perl5/vendor_perl/Bucardo.pm line 9879.
KID (database_sync) Kid has died, error is: DBD::Pg::db pg_putcopyend failed: ERROR:  duplicate key value violates unique constraint "interface_nodeid_ifindex_unique_idx"\nDETAIL:  Key (nodeid, ifindex)=(81, 1) already exists.\nCONTEXT:  COPY interface, line 2 at /usr/share/perl5/vendor_perl/Bucardo.pm line 9879. Line: 5041 Main DB state: ? Error: none DB database_node1 state: ? Error: none DB database_node2 state: 23505 Error: 7
DBI::db=HASH(0x2e1a708)->disconnect invalidates 9 active statement handles (either destroy statement handles or call finish on them before disconnecting) at /usr/share/perl5/vendor_perl/Bucardo.pm line 2756.
DBI::db=HASH(0x2e1a828)->disconnect invalidates 9 active statement handles (either destroy statement handles or call finish on them before disconnecting) at /usr/share/perl5/vendor_perl/Bucardo.pm line 2756.
KID (database_sync) Kid 22825 exiting at cleanup_kid. Sync "database_sync" public.interface Reason: DBD::Pg::db pg_putcopyend failed: ERROR:  duplicate key value violates unique constraint "interface_nodeid_ifindex_unique_idx"\nDETAIL:  Key (nodeid, ifindex)=(81, 1) already exists.\nCONTEXT:  COPY interface, line 2 at /usr/share/perl5/vendor_perl/Bucardo.pm line 9879. Line: 5041 Main DB state:

？错误:无DB database_node1状态：？错误:无数据库database_node2状态: 23505错误:7 MCP启动check_sync_health*

下面是我创建同步的步骤。

bucardo add database bucardo add table all --db="$database"_node1    --herd="$database"_herd 
bucardo add sequence all --db="$database"_node1 --herd="$database"_herd 
bucardo add dbgoup "$database"_group 
bucardo add dbgroup "$database"_group    "$database"_node1:source 
bucardo add dbgroup "$database"_group    "$database"_node2:source 
bucardo add sync "$database"_sync    herd="$database_herd"_herd dbs="$database"_group    conflict_strategy=bucardo_latest onetimecopy=2 stayalive=1    kidsalive=1 autokick=1 systemctl enable bucardo.service

请你帮我把你对这个问题的调查结果告诉我。我的数据库中的序列可以负责创建数据库中的重复条目吗？

Answer 1

当用户使用序列进行多源设置时，不能复制，否则就会出现冲突，因为您已经进行了实验。

• 从同步中删除序列。我是从内存中写的，而不是测试它，所以小心

bucardo remove sequence all
bucardo validate all
bucardo reload

• 更改每个源中的序列，以避免在两个数据库中创建相同的主键。Check this answer用于几个选项，如生成偶数、奇数；生成db1中的1、11、21、db2中的2、12、22等数字；或使用UUID.

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