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From: Ashutosh B. <ash...@en...> - 2012-02-29 09:22:23
|
Hi All, One of my colleague in Sybase, came across my article<http://www.linuxforu.com/2012/01/postgres-xc-database-clustering-solution/>in Linux For You magazine and sent following queries. I thought it better to discuss on XC general forum. Varprasad was earlier working with Sybase and has long experience with HA, Shared disk cluster and RDBMS in general. 1) what are the HA aspects of various component failures? What is current HA recommendations for various failures (coo, datanode or gtm etc)? 2) why GTM is desinged as centralized server? Is it possible to make it work in distributed manner so as to remove the bottleneck and SPOF? 3) what is the expacted scale-up for very large number of nodes 50-100, esp considering that the scale-up reduces with larger number of nodes. 4) Is GTM used for repeatable reads as well, apart from the Write transactions? 5) Do all coordinators need to be alive to get this setup working esp for DDLs. We observed that connection pooling component gives error when the DDL is fired after a coordinator crashes. -- Best Wishes, Ashutosh Bapat EntepriseDB Corporation The Enterprise Postgres Company |
