Thread: pg_basebackup state?

pg_basebackup state?

From
Ray Stell
Date:
I need help determining the state of the pg_basebackup command. This
works command works on other hosts and I make a connection as recorded
in the postmaster log:

2015-07-02 12:10:53 EDT,0,authentication LOG:  replication connection
authorized: user=rep

the process is running:
 > ps -ef | grep pg_base
pg     32600 11558  0 12:10 pts/1    00:00:00 pg_basebackup -D
basebackup/ --xlog --format=t  -P -U rep
pg     32601  1473  0 12:10 ?        00:00:00 postgres: wal sender
process rep [local] sending backup "pg_basebackup base backup"

but no data is written.  Looks like wal sender is hurt. max_wal_senders
= 3, I wonder if this is the reason for the stall. How to eval if this
is set to low?  Thanks.


Re: pg_basebackup state?

From
Ray Stell
Date:
On 7/2/15 12:39 PM, Ray Stell wrote:
> I need help determining the state of the pg_basebackup command. This
> works command works on other hosts and I make a connection as recorded
> in the postmaster log:
>
> 2015-07-02 12:10:53 EDT,0,authentication LOG:  replication connection
> authorized: user=rep
>
> the process is running:
> > ps -ef | grep pg_base
> pg     32600 11558  0 12:10 pts/1    00:00:00 pg_basebackup -D
> basebackup/ --xlog --format=t  -P -U rep
> pg     32601  1473  0 12:10 ?        00:00:00 postgres: wal sender
> process rep [local] sending backup "pg_basebackup base backup"
>
> but no data is written.  Looks like wal sender is hurt.
> max_wal_senders = 3, I wonder if this is the reason for the stall. How
> to eval if this is set to low?  Thanks.
v 9.4.4, I meant to include.


Re: pg_basebackup state?

From
"Joshua D. Drake"
Date:
On 07/02/2015 09:39 AM, Ray Stell wrote:
>
> I need help determining the state of the pg_basebackup command. This
> works command works on other hosts and I make a connection as recorded
> in the postmaster log:
>
> 2015-07-02 12:10:53 EDT,0,authentication LOG:  replication connection
> authorized: user=rep
>
> the process is running:
>  > ps -ef | grep pg_base
> pg     32600 11558  0 12:10 pts/1    00:00:00 pg_basebackup -D
> basebackup/ --xlog --format=t  -P -U rep
> pg     32601  1473  0 12:10 ?        00:00:00 postgres: wal sender
> process rep [local] sending backup "pg_basebackup base backup"
>
> but no data is written.  Looks like wal sender is hurt. max_wal_senders
> = 3, I wonder if this is the reason for the stall. How to eval if this
> is set to low?  Thanks.

It may be that pg_basebackup is waiting for a checkpoint to complete.
Try adding -cfast.

JD


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Re: pg_basebackup state?

From
Guillaume Lelarge
Date:

Le 2 juil. 2015 6:41 PM, "Ray Stell" <stellr@vt.edu> a écrit :
>
> I need help determining the state of the pg_basebackup command. This works command works on other hosts and I make a connection as recorded in the postmaster log:
>
> 2015-07-02 12:10:53 EDT,0,authentication LOG:  replication connection authorized: user=rep
>
> the process is running:
> > ps -ef | grep pg_base
> pg     32600 11558  0 12:10 pts/1    00:00:00 pg_basebackup -D basebackup/ --xlog --format=t  -P -U rep
> pg     32601  1473  0 12:10 ?        00:00:00 postgres: wal sender process rep [local] sending backup "pg_basebackup base backup"
>
> but no data is written.  Looks like wal sender is hurt. max_wal_senders = 3, I wonder if this is the reason for the stall. How to eval if this is set to low?  Thanks.
>

You wouldn't have the wal sender if it was too low.

Re: pg_basebackup state?

From
Ray Stell
Date:

On 7/2/15 12:50 PM, Joshua D. Drake wrote:
>
> On 07/02/2015 09:39 AM, Ray Stell wrote:
>>
>> I need help determining the state of the pg_basebackup command. This
>> works command works on other hosts and I make a connection as recorded
>> in the postmaster log:
>>
>> 2015-07-02 12:10:53 EDT,0,authentication LOG:  replication connection
>> authorized: user=rep
>>
>> the process is running:
>>  > ps -ef | grep pg_base
>> pg     32600 11558  0 12:10 pts/1    00:00:00 pg_basebackup -D
>> basebackup/ --xlog --format=t  -P -U rep
>> pg     32601  1473  0 12:10 ?        00:00:00 postgres: wal sender
>> process rep [local] sending backup "pg_basebackup base backup"
>>
>> but no data is written.  Looks like wal sender is hurt. max_wal_senders
>> = 3, I wonder if this is the reason for the stall. How to eval if this
>> is set to low?  Thanks.
>
> It may be that pg_basebackup is waiting for a checkpoint to complete.
> Try adding -cfast.
>
> JD

yep, that got it.  thanks.