Обсуждение: [GENERAL] Postgres logs showing error after replication

Поиск
Список
Период
Сортировка

[GENERAL] Postgres logs showing error after replication

От
Vijay Chaudhery
Дата:

Hi,

 

I am not sure if the sending email is the right way to get the forum help. Could you please let me know how to open forum query to ask postgres questions.

 

Thanks

vijay



::DISCLAIMER::
----------------------------------------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only.
E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted,
lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents
(with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates.
Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the
views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification,
distribution and / or publication of this message without the prior written consent of authorized representative of
HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately.
Before opening any email and/or attachments, please check them for viruses and other defects.

----------------------------------------------------------------------------------------------------------------------------------------------------

Re: [GENERAL] Postgres logs showing error after replication

От
Tatsuo Ishii
Дата:
> I am not sure if the sending email is the right way to get the forum help. Could you please let me know how to open
forumquery to ask postgres questions. 

Sending email to this mailing list regarding your questions is the
perfect way to get help.

Other than this, there's an IRC channel for PostgreSQL.
https://www.postgresql.org/community/irc/

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp


Re: [GENERAL] Postgres logs showing error after replication

От
Vijay Chaudhery
Дата:
Ok thank you,

I have promoted slave server as master in postgres streaming replication , howerver application is working fine after
promotion, but getting some error messages in the postgres log (slave which promoted to master)  

what does it mean?

<tag>
>ERROR: could not obtain lock on row in relation "main_instance"
< 2017-09-05 13:08:45.434 UTC >STATEMENT: SELECT "main_instance"."id", "main_instance"."uuid",
"main_instance"."hostname","main_instance"."created", "main_instance"."modified", "main_instance"."version",
"main_instance"."capacity"FROM "main_instance" LIMIT 1 FOR UPDATE NOWAIT 

</tag>

-----Original Message-----
From: Tatsuo Ishii [mailto:ishii@sraoss.co.jp]
Sent: 06 September 2017 10:02 AM
To: Vijay Chaudhery <vijay_c@hcl.com>
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Postgres logs showing error after replication

> I am not sure if the sending email is the right way to get the forum help. Could you please let me know how to open
forumquery to ask postgres questions. 

Sending email to this mailing list regarding your questions is the perfect way to get help.

Other than this, there's an IRC channel for PostgreSQL.
https://www.postgresql.org/community/irc/

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp


::DISCLAIMER::

----------------------------------------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only.
E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted,
lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents
(with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates.
Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the
views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification,
distribution and / or publication of this message without the prior written consent of authorized representative of
HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender
immediately.
Before opening any email and/or attachments, please check them for viruses and other defects.


----------------------------------------------------------------------------------------------------------------------------------------------------



Re: [GENERAL] Postgres logs showing error after replication

От
Tatsuo Ishii
Дата:
> Ok thank you,
>
> I have promoted slave server as master in postgres streaming replication , howerver application is working fine after
promotion, but getting some error messages in the postgres log (slave which promoted to master)  
>
> what does it mean?
>
> <tag>
>>ERROR: could not obtain lock on row in relation "main_instance"
> < 2017-09-05 13:08:45.434 UTC >STATEMENT: SELECT "main_instance"."id", "main_instance"."uuid",
"main_instance"."hostname","main_instance"."created", "main_instance"."modified", "main_instance"."version",
"main_instance"."capacity"FROM "main_instance" LIMIT 1 FOR UPDATE NOWAIT 

Your session (transction) tried to get a row lock on the row but other
session (transaction) has already gotten the row lock on the same row.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp


Re: [GENERAL] Postgres logs showing error after replication

От
Vijay Chaudhery
Дата:
Ok is it possible to release the lock? or it is just a warning messages only?
thanks

-----Original Message-----
From: Tatsuo Ishii [mailto:ishii@sraoss.co.jp]
Sent: 06 September 2017 10:31 AM
To: Vijay Chaudhery <vijay_c@hcl.com>
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Postgres logs showing error after replication

> Ok thank you,
>
> I have promoted slave server as master in postgres streaming
> replication , howerver application is working fine after promotion ,
> but getting some error messages in the postgres log (slave which
> promoted to master)
>
> what does it mean?
>
> <tag>
>>ERROR: could not obtain lock on row in relation "main_instance"
> < 2017-09-05 13:08:45.434 UTC >STATEMENT: SELECT "main_instance"."id",
> "main_instance"."uuid", "main_instance"."hostname",
> "main_instance"."created", "main_instance"."modified",
> "main_instance"."version", "main_instance"."capacity" FROM
> "main_instance" LIMIT 1 FOR UPDATE NOWAIT

Your session (transction) tried to get a row lock on the row but other session (transaction) has already gotten the row
lockon the same row. 

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp


::DISCLAIMER::

----------------------------------------------------------------------------------------------------------------------------------------------------

The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only.
E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted,
lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents
(with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates.
Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the
views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification,
distribution and / or publication of this message without the prior written consent of authorized representative of
HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender
immediately.
Before opening any email and/or attachments, please check them for viruses and other defects.


----------------------------------------------------------------------------------------------------------------------------------------------------



Re: [GENERAL] Postgres logs showing error after replication

От
Vick Khera
Дата:
On Wed, Sep 6, 2017 at 1:16 AM, Vijay Chaudhery <vijay_c@hcl.com> wrote:
Ok is it possible to release the lock? or it is just a warning messages only?
thanks

The message starts with "ERROR" so it is an error, not a warning. The command failed. The only way to release the lock is to have the other connection do it.