postgres-xc-developers Mailing List for Postgres-XC

Postgres-XC development team is pleased to announce that Postgres-XC
Version 0.9.3 is now available.

Major additional features include:

Transparent DDL.   Now DDL is automatically propagated to all the
coordinators and data nodes.
General SQL support:  Statements may include cross node joins.
Extended protocol support for libpq:  This is needed to use
Postgres-XC from Java.
Cursor support: This is also needed by Java and other languages.
Global Timestamp:  Timestamps are now supplied by GTM.

This version includes many bug fixes and is much more stable than
previous ones.   We've tested DBT-1 benchmark for one week with 90% of
full load.   The test ran stably without any error in DBT-1.

You can download the release from Postgres-XC project page:
https://sourceforge.net/projects/postgres-xc/
General information is available in Project page:
http://postgres-xc.sourceforge.net/
----------
Postgres-XC Development Team
Koichi Suzuki

>
> Enclosure is my patch for bug#3010262. Your suggestions will be 
> appreciated.
>                                                                               
> Truely,
>                                                                                 
> Benny
>
>
>


Thanks, Benny.

In looking at the patch, I am guessing the main issue you fixed was that 
it will create an additional create index command, and that we do not 
want to send it down to the data nodes since one already ran as part of 
the create table.

I think we should try and avoid modifying the existing PostgreSQL 
function parameter list like that for transformIndexConstraints() if 
reasonably (stress: reasonably) possible to make merging and maintenance 
of PostgreSQL easier.  Can CreateStmtContext.isalter be used instead? 
Can it even be used in utility.c instead of isFromCreateStmt?

Thanks,

Mason
>
>
> ------------------------------------------------------------------------------
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-- 
Mason Sharp
EnterpriseDB Corporation
The Enterprise Postgres Company


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Benny,

Just to provide more background, PostgreSQL uses MVCC, so transaction 
ids (XID or GXID) are important for determining what is visible within 
the database.  These IDs are obtained from GTM. If in the cluster these 
advance and GTM is restarted with a low XID, then your previous work 
will not be visible. It is important to start it with at least the last id.

As Koichi mentioned, if you stop gracefully it will write the current 
value in a file and on restart will read this value (unless overridden 
by a passed in value).  If GTM crashed and you restart, you will need to 
manually pass in a high value. As Koichi also mentioned, we are 
currently working on this to recover this value properly.

Regards,

Mason



On 10/22/10 3:26 AM, Koichi Suzuki wrote:
> How did you stop and restart GTM?
>
> If you stop gtm gracefully, it will restart to start with next GXID.
> If GTM crashed and you restart, you may need to specify GXID to start with.
>
> Safer GTM recovery and restart will be implemented by the end of this year.
>
> Regards;
> ---
> Koichi Suzuki
>
> (2010年10月22日 15:59), mei le wrote:
>    
>> Deras,
>> When I restart the GTM, all my tables disppeare. I don't know why. Is is
>> a problem or was what I did wrong?
>> Your reply will be appreciated.
>> Truely,
>> Benny
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Nokia and AT&T present the 2010 Calling All Innovators-North America contest
>> Create new apps&   games for the Nokia N8 for consumers in  U.S. and Canada
>> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
>> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
>> http://p.sf.net/sfu/nokia-dev2dev
>>
>>
>>
>> _______________________________________________
>> Postgres-xc-developers mailing list
>> Pos...@li...
>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers
>>      
>
> ------------------------------------------------------------------------------
> Nokia and AT&T present the 2010 Calling All Innovators-North America contest
> Create new apps&  games for the Nokia N8 for consumers in  U.S. and Canada
> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
> http://p.sf.net/sfu/nokia-dev2dev
> _______________________________________________
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> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers
>    


-- 
Mason Sharp
EnterpriseDB Corporation
The Enterprise Postgres Company


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How did you stop and restart GTM?

If you stop gtm gracefully, it will restart to start with next GXID. 
If GTM crashed and you restart, you may need to specify GXID to start with.

Safer GTM recovery and restart will be implemented by the end of this year.

Regards;
---
Koichi Suzuki

(2010年10月22日 15:59), mei le wrote:
> Deras,
> When I restart the GTM, all my tables disppeare. I don't know why. Is is
> a problem or was what I did wrong?
> Your reply will be appreciated.
> Truely,
> Benny
>
>
>
>
> ------------------------------------------------------------------------------
> Nokia and AT&T present the 2010 Calling All Innovators-North America contest
> Create new apps&  games for the Nokia N8 for consumers in  U.S. and Canada
> $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
> Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
> http://p.sf.net/sfu/nokia-dev2dev
>
>
>
> _______________________________________________
> Postgres-xc-developers mailing list
> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers

Deras,
 
When I restart the GTM, all my tables disppeare. I don't know why. Is is a problem or was what I did wrong? 
 
Your reply will be appreciated.
 
                                                                                     Truely,
                                                                                       Benny


      

Benny,

Thanks for reporting this. It turns out this is working in the 
PGXC-sqlmed branch in the git repository.  This branch will be merged 
into HEAD sometime soon and the issue will no longer occur.

In general there are some improvements we should do for cartesian products.

Thanks,

Mason



On 10/19/10 9:49 PM, Koichi Suzuki wrote:
> Hi,
>
> I'm afraid "from tt1, tt2" causes curtesian product of two tables, which
> may not be supported at present version.
> I suppose "select count(*) from tt1;" and "select count(*) from tt2;"
> will run without problems.
>
> Cheers;
> ---
> Koichi
>
> (2010年10月20日 10:37), mei le wrote:
>    
>> Dears,
>> steps:
>> 1.create table tt1(a int);
>> 2.create table tt2(a int);
>> 3.insert into tt1 values(1);insert into tt2 values(1);
>> 4.select count(*) from tt1,tt2;
>> template1=# select count(*) from tt1,tt2;
>> 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 2239) was terminated by signal 11: Segmentation fault
>> LOG: terminating any other active server processes
>> LOG: all server processes terminated; reinitializing
>> LOG: database system was interrupted; last known up at 2010-10-20
>> 09:36:17 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 0/4DA980
>> LOG: redo is not required
>> Using aggregate functions on mutiple tables join will all cause such a
>> problem.
>> Benny
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Download new Adobe(R) Flash(R) Builder(TM) 4
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>> Flex(R) Builder(TM)) enable the development of rich applications that run
>> across multiple browsers and platforms. Download your free trials today!
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>>
>>
>>
>> _______________________________________________
>> Postgres-xc-developers mailing list
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>> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers
>>      
>
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-- 
Mason Sharp
EnterpriseDB Corporation
The Enterprise Postgres Company


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Hi,

I'm afraid "from tt1, tt2" causes curtesian product of two tables, which 
may not be supported at present version.
I suppose "select count(*) from tt1;" and "select count(*) from tt2;" 
will run without problems.

Cheers;
---
Koichi

(2010年10月20日 10:37), mei le wrote:
> Dears,
> steps:
> 1.create table tt1(a int);
> 2.create table tt2(a int);
> 3.insert into tt1 values(1);insert into tt2 values(1);
> 4.select count(*) from tt1,tt2;
> template1=# select count(*) from tt1,tt2;
> 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 2239) was terminated by signal 11: Segmentation fault
> LOG: terminating any other active server processes
> LOG: all server processes terminated; reinitializing
> LOG: database system was interrupted; last known up at 2010-10-20
> 09:36:17 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 0/4DA980
> LOG: redo is not required
> Using aggregate functions on mutiple tables join will all cause such a
> problem.
> Benny
>
>
>
>
> ------------------------------------------------------------------------------
> Download new Adobe(R) Flash(R) Builder(TM) 4
> The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly
> Flex(R) Builder(TM)) enable the development of rich applications that run
> across multiple browsers and platforms. Download your free trials today!
> http://p.sf.net/sfu/adobe-dev2dev
>
>
>
> _______________________________________________
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> Pos...@li...
> https://lists.sourceforge.net/lists/listinfo/postgres-xc-developers

Dears,
 
steps:
1.create table tt1(a int);
2.create table tt2(a int);
3.insert into tt1 values(1);insert into tt2 values(1);
4.select count(*) from tt1,tt2;
template1=# select count(*) from tt1,tt2;
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 2239) was terminated by signal 11: Segmentation fault
LOG:  terminating any other active server processes
LOG:  all server processes terminated; reinitializing
LOG:  database system was interrupted; last known up at 2010-10-20 09:36:17 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 0/4DA980
LOG:  redo is not required
 
Using aggregate functions on mutiple tables join will all cause such a problem.
 
                                                                         Benny 


      

Dears,
 
Maybe a bug. My test environment:two coordinators, two datanodes.The steps are described as follows:
1. create table tt(a int);
2. alter table tt add constraint pk primary key(a);
3. insert into tt values(8);
4. insert into tt values(8);
when execute step 4, something happened.
 
coordinator log:
template1=# insert into tt values(8);
INSERT 0 1
template1=# insert into tt values(8);
WARNING:  unexpected EOF on datanode connection
ERROR:  Failed to read response from data nodes
STATEMENT:  insert into tt values(8);
WARNING:  unexpected EOF on datanode connection
WARNING:  unexpected EOF on datanode connection
WARNING:  unexpected EOF on datanode connection
ERROR:  Failed to read response from data nodes
template1=# LOG:  failed to connect to data node
LOG:  failed to connect to data node
 
Two datanodes' logs are described respectively.
local one:
LOG:  statement: BEGIN
LOG:  statement: insert into tt values(8);
LOG:  statement: PREPARE TRANSACTION 'T116'
LOG:  statement: COMMIT PREPARED 'T116'
LOG:  statement: BEGIN
LOG:  statement: insert into tt values(8);
ERROR:  duplicate key value violates unique constraint "pk"
STATEMENT:  insert into tt values(8);
PANIC:  cannot abort transaction 118, it was already committed
LOG:  server process (PID 1374) was terminated by signal 6: Aborted
LOG:  terminating any other active server processes
LOG:  all server processes terminated; reinitializing
LOG:  database system was interrupted; last known up at 2010-10-19 14:30:31 CST
LOG:  database system was not properly shut down; automatic recovery in progress
The session started: 1376
FATAL:  the database system is in recovery mode
LOG:  redo starts at 0/4BC07C
LOG:  record with zero length at 0/4BC408
LOG:  redo done at 0/4BC3DC
LOG:  last completed transaction was at log time 2021-08-06 21:02:14.101545+08
LOG:  autovacuum launcher started
LOG:  database system is ready to accept connections
 
The remote datanode log:
LOG:  statement: BEGIN
LOG:  statement: insert into tt values(8);
LOG:  statement: PREPARE TRANSACTION 'T116'
LOG:  statement: COMMIT PREPARED 'T116'
LOG:  statement: BEGIN
LOG:  statement: insert into tt values(8);
LOG:  statement: ROLLBACK
PANIC:  cannot abort transaction 118, it was already committed
STATEMENT:  ROLLBACK
LOG:  server process (PID 28899) was terminated by signal 6: Aborted
LOG:  terminating any other active server processes
LOG:  all server processes terminated; reinitializing
LOG:  database system was interrupted; last known up at 2010-10-19 14:29:49 CST
LOG:  database system was not properly shut down; automatic recovery in progress
The session started: 28901
FATAL:  the database system is in recovery mode
LOG:  redo starts at 0/712738
LOG:  record with zero length at 0/712A44
LOG:  redo done at 0/712A18
LOG:  last completed transaction was at log time 2021-08-06 21:01:31.960109+08
LOG:  autovacuum launcher started
LOG:  database system is ready to accept connections
 
                                                                                  Truely,
                                                                                   Benny
 


      

Hi Benny,

This was one of the items on the bug list I had previously sent to you.  

Thanks,

Mason



Sent from my IPhone

On Oct 17, 2010, at 10:49 PM, mei le <lem...@ya...> wrote:

> Dears,
>  
> One bug occured.
>  
> template1=# create table t2(a int primary key);
> 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 2429) was terminated by signal 11: Segmentation fault
> LOG:  terminating any other active server processes
> FATAL:  failed to connect to pool manager: Connection refused
> WARNING:  terminating connection because of crash of another server process
> DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
> HINT:  In a moment you should be able to reconnect to the database and repeat your command.
> Failed.
> !>
>  
>  
>                                                                                        Truely,
>                                                                                             Benny
> 
>  
> ------------------------------------------------------------------------------
> Download new Adobe(R) Flash(R) Builder(TM) 4
> The new Adobe(R) Flex(R) 4 and Flash(R) Builder(TM) 4 (formerly 
> Flex(R) Builder(TM)) enable the development of rich applications that run
> across multiple browsers and platforms. Download your free trials today!
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Dears,
 
One bug occured.
 
template1=# create table t2(a int primary key);
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 2429) was terminated by signal 11: Segmentation fault
LOG:  terminating any other active server processes
FATAL:  failed to connect to pool manager: Connection refused
WARNING:  terminating connection because of crash of another server process
DETAIL:  The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
HINT:  In a moment you should be able to reconnect to the database and repeat your command.
Failed.
!>
 
 
                                                                                       Truely,
                                                                                            Benny


      

On 10/14/10 3:30 AM, mei le wrote:
> Dears,
> Postgres-xc version 0.9.2 has error process at the end of funcion 
> "ExecRemoteQuery" but such a part was deleted by later patch.In 
> postgres-xc 0.9.2, if I create a table on one datanode, I can't create 
> table on other datanodes by executing create table statment on 
> Coordinator, but the newest code can create table on other datanodes 
> by executiong same statement on Coordinator.I think the former version 
> is more appropriate than the newest code. Could you give me some 
> explains on this issue?
> Thanks.
>                                                                                       
> Truely,
>                                                                                              
> Benny
>
>

Benny,

I am sorry, can you please explain again, I think I do not understand.

In Postgres-XC, when you create a table, you do it against a 
Coordinator, and not a Data Node. The Coordinator will automatically 
create the table on the Data Nodes for you. It should be this way for 
both 0.9.2 and the latest code in the git repository.

Please let me know if I misunderstood something.

Thanks,

Mason


>
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-- 
Mason Sharp
EnterpriseDB Corporation
The Enterprise Postgres Company


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Dears,
 
Postgres-xc version 0.9.2 has error process at the end of funcion "ExecRemoteQuery" but such a part was deleted by later patch.In postgres-xc 0.9.2, if I create a table on one datanode, I can't create table on other datanodes by executing create table statment on Coordinator, but the newest code can create table on other datanodes by executiong same statement on Coordinator.I think the former version is more appropriate than the newest code. Could you give me some explains on this issue?
 
Thanks.
 
                                                                                      Truely,
                                                                                             Benny


      

Thanks, I will look at it soon more carefully.

A manual checkpoint should not occur too often, so I am not that 
concerned about efficiency for this case. Can the other code you did be 
used for other cases, too?

Thanks,

Mason


On 10/13/10 5:35 AM, mei le wrote:
> Dears,
> I made two patches for bug 
> https://sourceforge.net/tracker/?limit=25&func=&group_id=311227&atid=1310232&assignee=&status=&category=&artgroup=&keyword=&submitter=&artifact_id=&assignee=&status=1&category=&artgroup=&submitter=&keyword=&artifact_id=&submit=Filter&mass_category=&mass_priority=&mass_resolution=&mass_assignee=&mass_artgroup=&mass_status=&mass_cannedresponse= 
> <https://sourceforge.net/tracker/?limit=25&func=&group_id=311227&atid=1310232&assignee=&status=&category=&artgroup=&keyword=&submitter=&artifact_id=&assignee=&status=1&category=&artgroup=&submitter=&keyword=&artifact_id=&submit=Filter&mass_category=&mass_priority=&mass_resolution=&mass_assignee=&mass_artgroup=&mass_status=&mass_cannedresponse=>
> 3076224    checkpoint command causes seg fault
> 3010262    Primary Key in CREATE TABLE
> 3013984    Sequence scope
> 3013562    Multiple insert not possible
> The first one is the most simple method to solve the bug, but it may 
> lower efficency. So, I made second one which did special process for 
> checkpoint which doesn't need transaction process.
> Looking forward your kindly reply.
>                                                                                       
> Truely,
>                                                                                               
> Benny
> --- *10年9月30日，周四, Mason Sharp /<mas...@en...>/* 
> 写道：
>
>
>     发件人: Mason Sharp <mas...@en...>
>     主题: tasks
>     收件人: "mei le" <lem...@ya...>
>     抄送: ""03：鈴木(幸)様(DI)"" <ko...@in...>
>     日期: 2010年9月30日,周四,下午4:46
>
>     I understand you and your friends are busy for a while.
>
>     If you would like to get involved, once you have more time later,
>     here are some tasks that might be some good ones to start with, in
>     approximate order of what makes sense to work on.
>
>
>
>     Bugs
>
>     https://sourceforge.net/tracker/?limit=25&func=&group_id=311227&atid=1310232&assignee=&status=&category=&artgroup=&keyword=&submitter=&artifact_id=&assignee=&status=1&category=&artgroup=&submitter=&keyword=&artifact_id=&submit=Filter&mass_category=&mass_priority=&mass_resolution=&mass_assignee=&mass_artgroup=&mass_status=&mass_cannedresponse=
>     <https://sourceforge.net/tracker/?limit=25&func=&group_id=311227&atid=1310232&assignee=&status=&category=&artgroup=&keyword=&submitter=&artifact_id=&assignee=&status=1&category=&artgroup=&submitter=&keyword=&artifact_id=&submit=Filter&mass_category=&mass_priority=&mass_resolution=&mass_assignee=&mass_artgroup=&mass_status=&mass_cannedresponse=>
>
>     3076224    checkpoint command causes seg fault
>     3010262    Primary Key in CREATE TABLE
>     3013984    Sequence scope
>     3013562    Multiple insert not possible
>
>
>
>     Features
>
>     https://sourceforge.net/tracker/?group_id=311227&atid=1310235
>     <https://sourceforge.net/tracker/?group_id=311227&atid=1310235>
>
>     3000104    COPY TO with SELECT
>     3014003    Pooler Request Queuing
>     3014002    Pooler should shrink
>     3022406    Safer Hash Distribution to Data Nodes
>
>
>     Thanks,
>
>     Mason
>
>     -- 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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Dears，
 
When I read code，I found something wrong in fuction "commit_prepared_transaction" which maybe a mistake. I think there should be one sentence that "return 0;" before label "send_failed" in function "commit_prepared_transaction".
 
                                                                        Truely,
                                                                           Benny