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[数据库][原]Greenplum failed segment的恢复方法


  当在使用greenplum过程中有不当的操作时,可能会出现segment节点宕掉的情况(比如在greenplum运行的过程中停掉其中几台segment节点的服务器),通过下面的方法可以恢复segment。

下面是现场出现的故障情况:

[gpadmin@tj-soc-c04-csfb1 ~]$ gpstate -m20161010:16:35:54:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-Starting gpstate with args: -m20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 4.3.6.2 build 1'20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-master Greenplum Version: 'PostgreSQL 8.2.15 (Greenplum Database 4.3.6.2 build 1) on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.4.2 compiled on Nov 12 2015 23:50:28'20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-Obtaining Segment details from master...20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:--------------------------------------------------------------20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:--Current GPDB mirror list and status20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:--Type = Group20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:--------------------------------------------------------------20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-  Mirror       Datadir            Port  Status       Data Status    20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-tj-soc-c04-csfb2  /data1/gpdata/mirror/gpseg0  41000  Failed                <<<<<<<<20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-tj-soc-c04-csfb2  /data1/gpdata/mirror/gpseg1  41001  Failed                <<<<<<<<20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-tj-soc-c04-csfb3  /data1/gpdata/mirror/gpseg2  41000  Failed                <<<<<<<<20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-tj-soc-c04-csfb3  /data1/gpdata/mirror/gpseg3  41001  Failed                <<<<<<<<20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-  tj-soc-c04-csfb4  /data1/gpdata/mirror/gpseg4  41000  Acting as Primary  Change Tracking20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:-  tj-soc-c04-csfb4  /data1/gpdata/mirror/gpseg5  41001  Acting as Primary  Change Tracking20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-tj-soc-c04-csfb1  /data1/gpdata/mirror/gpseg6  41000  Failed                <<<<<<<<20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-tj-soc-c04-csfb1  /data1/gpdata/mirror/gpseg7  41001  Failed                <<<<<<<<20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[INFO]:--------------------------------------------------------------20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-2 segment(s) configured as mirror(s) are acting as primaries20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-6 segment(s) configured as mirror(s) have failed20161010:16:35:55:026100 gpstate:tj-soc-c04-csfb1:gpadmin-[WARNING]:-2 mirror segment(s) acting as primaries are in change tracking

可以看到有6个节点Failed,有2个节点的Primary和Mirror交换了。

一、首先需要停掉GP

gpstop -M fast -a  这样会告诉你有几个节点DOWN了

 

二、启动GP

gpstart  启动数据库会忽略DOWN的节点

 

三、生成一个恢复配置文件

gprecoverseg -o ./recov  会在当前目录生成一个recov文件,里面包含了要恢复的节点信息

recov文件内容如下:(注意:这个文件不是手动创建的,而是通过gprecoverseg -o ./recov命令生成的

filespaceOrder=
tj-soc-c04-csfb2:41000:/data1/gpdata/mirror/gpseg0tj-soc-c04-csfb2:41001:/data1/gpdata/mirror/gpseg1tj-soc-c04-csfb3:41000:/data1/gpdata/mirror/gpseg2tj-soc-c04-csfb3:41001:/data1/gpdata/mirror/gpseg3tj-soc-c04-csfb1:41000:/data1/gpdata/mirror/gpseg6tj-soc-c04-csfb1:41001:/data1/gpdata/mirror/gpseg7

 

四、使用恢复配置文件恢复节点

$gprecoverseg -i ./recov

恢复过程中可以用gpstate -m 查看恢复状态:Resynchronizing(表示正在恢复中),Synchronized(表示恢复完毕)

 

五、调整Primary和Mirror

上面的情况中有Primary和Mirror兑换的情况,所以需要把他们换回来,可以用下面的命令

gprecoverseg -r

等待所有的节点都是Synchronized后,segment就恢复好了