Re: Cannot change archive_command with a reload

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On Sun, Feb 2, 2014 at 11:32 AM, Erik Darling <edarling80(at)gmail(dot)com> wrote:

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>
>
> On Sun, Feb 2, 2014 at 11:26 AM, CS DBA <cs_dba(at)consistentstate(dot)com>wrote:
>
>> On 2/2/14, 9:19 AM, Raghavendra wrote:
>>
>>
>>
>> On Sun, Feb 2, 2014 at 9:22 PM, CS DBA <cs_dba(at)consistentstate(dot)com>wrote:
>>
>>> Hi all;
>>>
>>> we have a cluster running with an archive command that is failing.
>>> I tried a reload and the value does not change
>>>
>>>
>> Reload with new value won't work until you fix the failing
>> archive_command.
>>
>> Eg:-
>>
>> ps -ef | grep arch
>> postgres 29743 29736 0 Jan30 ? 00:00:00 postgres: archiver
>> process failed on 00000001000000010000003D
>>
>> and it might cause same error you are experiencing as
>>
>> postgres=# select set_config('archive_command','cp %p
>> /opt/PostgreSQL/9.3/a93/%f',false);
>> ERROR: parameter "archive_command" cannot be changed now
>>
>> So, fix the archive_command first and then give new changes.
>>
>> Tried a set_config and I get this error:
>>>
>>> select set_config ('archive_command', 'cp %p /data/wal_tmp/%f && mv
>>> /data/wal_tmp/%f /data/wal/&f', 'false');
>>> ERROR: parameter "archive_command" cannot be changed now
>>>
>>>
>> If your archive_command pointing to "/data/wal_tmp" then please ensure
>> that directory exists there. If that directory not present then archive
>> process fail to copy the transaction logs. When archiver process in failed
>> state you cannot apply any new changes to the archive_command it will fail.
>>
>> Also, am surprised to see "mv" command, basically the archive_command
>> meant to have a copies of pg_xlogs but not any OS related directory
>> movements.
>>
>>
>> we want to copy the file to /data/wal_tmp, then do a mv to /data/wal so
>> our process that ships a copy to the standby servers never see's a partial
>> file (since it watches /data/wal)
>>
>>
>> Link on archive_command:
>> http://www.postgresql.org/docs/9.2/static/runtime-config-wal.html
>>
>>
>> ---
>> Regards,
>> Raghavendra
>> EnterpriseDB Corporation
>> Blog: http://raghavt.blogspot.com/
>>
>>
>>
>