postgres-xc-developers Mailing List for Postgres-XC

When I use checkpoint command, the coordinator report the error as belows.Is it a bug or something?
 
template1=# checkpoint;
server closed the connection unexpectedly
 This probably means the server terminated abnormally
 before or while processing the request.
The connection to the server was lost. Attempting reset: LOG:  server process (PID 20650) was terminated by signal 11: Segmentation fault
LOG:  terminating any other active server processes
LOG:  unexpected EOF on client connection
LOG:  all server processes terminated; reinitializing
LOG:  database system was interrupted; last known up at 2010-09-26 11:41:16 CST
LOG:  database system was not properly shut down; automatic recovery in progress
FATAL:  failed to connect to pool manager: Connection refused
Failed.
!> LOG:  record with zero length at 0/4D9538
LOG:  redo is not required


      

Benny,

An additional comment-

In the source code, most of the changes compared to PostgreSQL are below 
src/backend/pgxc. These are all new files. You can look through and read 
comments.

In addition, changes to existing PostgreSQL modules can be easily found 
by searching for the string PGXC, so you can see what changed and why.

Thanks,

Mason


On 9/20/10 12:15 AM, Koichi Suzuki wrote:
> Benny,
>
> Thank you very much for the suggestion.    Yes, I understand the 
> README is not rich.   Instead, we have "architecture" document which 
> you can download separately, as well as other manual and guidelines.
>
> Could you try these documents?   Especially, I made "architecture" 
> document as a separate one because XC internal is not simple to 
> understand and I thought usual document with graphics and tables will 
> be more helpful.
>
> Your advice is very valuable.   I'll be waiting for your further advice.
>
> Thank you very much;
> ----------
> Koichi Suzuki
>
>
> 2010/9/19 mei le <lem...@ya... 
> <mailto:lem...@ya...>>
>
>     Dears :
>
>     This is Benny ,a postgraduate for DBMS from DUTchina. I have
>     studied postgreSQL for a long time. And I have always kept close
>     eye on postgreSQL cluster solutions such as PGCluster-2 and
>     GridSQL etc. After postgres-xc released, I have learned much about
>     it. It's a great cluster frame. I have been reading postgres-xc
>     source code recently.
>
>              Reading PostgresSQL code, I always like to read README
>     under relative directory, which can make me learn more knowledge
>     on its relative functions. But when I scan postgres-xc code which
>     was freshly added, I can't find any README to introduce the
>     summary or relative knowledge. I think README is very important to
>     an open source code. I don't know why postgres-xc ignores README
>     files .Could we add the README files later?
>
>                                                                                              
>     Truly yours,
>
>     Benny
>
>
>
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>
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>    


-- 
Mason Sharp
EnterpriseDB Corporation
The Enterprise Postgres Company


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On 9/20/10 4:19 AM, mei le wrote:
> Dears:
>      I've learned much about postgres-xc recently. I am very 
> interested in its "architecture". I want do some experiments based on 
> it for my postgraduate paper.
>      By reading the documents and source code, I found it will be a 
> long time from postgres-xc stability and high performance. For 
> example, there's no any HA(High-Availability) solution such as standby 
> during the cluster running. In addition, many statements are not 
> supported in postgres-0.9.2-release.You will be greatly appreciated if 
> you could tell me something about postgres-xc recent and 
> future development schedule. According to that, I can make an 
> appropriate experiment plan. It’s a little bit urgent, thank you for 
> your reply. I will always keep eyes on our postgres-xc.
>                                                                           
> Yours truly,
>                                                                                
> Benny
>
Benny,

There was a talk we gave at PG con in Ottawa in May. In the presentation 
slides was some additional info about upcoming features. There is some 
audio here: http://www.pgcon.org/2010/schedule/events/226.en.html.

The amount of SQL coverage has expanded greatly compared to when we 
first announced the project, and the current development head adds even 
more, if you want to download that.

HA is currently being designed and discussed so you can expect to see 
that in the future.

If it fits in with your post-graduate work, please feel free to get 
involved and contribute to the project.

Regards,

Mason



>
> ------------------------------------------------------------------------------
> Start uncovering the many advantages of virtual appliances
> and start using them to simplify application deployment and
> accelerate your shift to cloud computing.
> http://p.sf.net/sfu/novell-sfdev2dev
>
>
> _______________________________________________
> Postgres-xc-developers mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers
>    


-- 
Mason Sharp
EnterpriseDB Corporation
The Enterprise Postgres Company


This e-mail message (and any attachment) is intended for the use of
the individual or entity to whom it is addressed. This message
contains information from EnterpriseDB Corporation that may be
privileged, confidential, or exempt from disclosure under applicable
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the sender immediately by reply e-mail and delete this message.

Dears:
     I've learned much about postgres-xc recently. I am very interested in its "architecture". I want do some experiments based on it for my postgraduate paper.
     By reading the documents and source code, I found it will be a long time from postgres-xc stability and high performance. For example, there's no any HA(High-Availability) solution such as standby during the cluster running. In addition, many statements are not supported in postgres-0.9.2-release.You will be greatly appreciated if you could tell me something about postgres-xc recent and future development schedule. According to that, I can make an appropriate experiment plan. It’s a little bit urgent, thank you for your reply. I will always keep eyes on our postgres-xc.
                                                                          Yours truly,
                                                                               Benny
 


      

Benny,

Thank you very much for the suggestion.    Yes, I understand the README is
not rich.   Instead, we have "architecture" document which you can download
separately, as well as other manual and guidelines.

Could you try these documents?   Especially, I made "architecture" document
as a separate one because XC internal is not simple to understand and I
thought usual document with graphics and tables will be more helpful.

Your advice is very valuable.   I'll be waiting for your further advice.

Thank you very much;
----------
Koichi Suzuki


2010/9/19 mei le <lem...@ya...>

> Dears :
>
>        This is Benny ,a postgraduate for DBMS from DUTchina. I have
> studied postgreSQL for a long time. And I have always kept close eye on
> postgreSQL cluster solutions such as PGCluster-2 and GridSQL etc. After
> postgres-xc released, I have learned much about it. It's a great cluster
> frame. I have been reading postgres-xc source code recently.
>
>
>
>          Reading PostgresSQL code, I always like to read README under
> relative directory, which can make me learn more knowledge on its relative
> functions. But when I scan postgres-xc code which was freshly added, I can't
> find any README to introduce the summary or relative knowledge. I think
> README is very important to an open source code. I don't know why
> postgres-xc ignores README files .Could we add the README files later?
>
>
>
>
> Truly yours,
>
>
>
> Benny
>
>
>
>
> ------------------------------------------------------------------------------
> Start uncovering the many advantages of virtual appliances
> and start using them to simplify application deployment and
> accelerate your shift to cloud computing.
> http://p.sf.net/sfu/novell-sfdev2dev
> _______________________________________________
> Postgres-xc-developers mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers
>
>

Dears :
       This is Benny ,a postgraduate for DBMS from DUTchina. I have studied postgreSQL for a long time. And I have always kept close eye on postgreSQL cluster solutions such as PGCluster-2 and GridSQL etc. After postgres-xc released, I have learned much about it. It's a great cluster frame. I have been reading postgres-xc source code recently. 
 
         Reading PostgresSQL code, I always like to read README under relative directory, which can make me learn more knowledge on its relative functions. But when I scan postgres-xc code which was freshly added, I can't find any README to introduce the summary or relative knowledge. I think README is very important to an open source code. I don't know why postgres-xc ignores README files .Could we add the README files later?
 
                                                                                          Truly yours,
                                                                                           Benny



      

Thanks.

I'll collect other developer's opinion.  I see there's no harm anyway.

BTW, in terms of new rpm, we're planning to release the new version 
early in Octover with much more range of statement support, as well as 
synchronized DDL over multiple coordinators and other feature.

I think it's better to work with this version and I hope you can arrange 
your schedule more flexibly.  We're at the last stage of new version's 
release, which also comes with global installer/configurator.  I'll let 
you know the precise date.

Regards and thank you very much;
---
Koichi Suzuki

(2010年09月15日 15:47), Devrim GÜNDÜZ wrote:
> Hi,
>
> I remember that brought up this before:
>
> http://svn.pgrpms.org/browser/rpm/redhat/8.4/postgres-xc/F-13/postgres-xc-09-build.patch
>
> This patch is needed to build Postgres-XC under my boxes. If it does not
> break your environment, could you please apply it to git? Otherwise, I
> will keep it for RPMs.
>
> Regards,
>
>
>
>
> ------------------------------------------------------------------------------
> Start uncovering the many advantages of virtual appliances
> and start using them to simplify application deployment and
> accelerate your shift to cloud computing.
> http://p.sf.net/sfu/novell-sfdev2dev
>
>
>
> _______________________________________________
> Postgres-xc-developers mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers

Hi,

I remember that brought up this before:

http://svn.pgrpms.org/browser/rpm/redhat/8.4/postgres-xc/F-13/postgres-xc-09-build.patch

This patch is needed to build Postgres-XC under my boxes. If it does not
break your environment, could you please apply it to git? Otherwise, I
will keep it for RPMs. 

Regards,

-- 
Devrim GÜNDÜZ
PostgreSQL Danışmanı/Consultant, Red Hat Certified Engineer
PostgreSQL RPM Repository: http://yum.pgrpms.org
Community: devrim~PostgreSQL.org, devrim.gunduz~linux.org.tr
http://www.gunduz.org  Twitter: http://twitter.com/devrimgunduz