[pgpool-general: 3152] Re: vacuum analyze caused node degeneration

[Sean Hogan]

Does anyone have any thought on this?

Thanks,
Sean

On 14-09-02 10:07 AM, Sean Hogan wrote:
> Hi,
>
> Recently during a test event we had an unexpected node degeneration, 
> and I need to provide some reasonable explanation of why it happened.  
> Our system is two pgpool-II 3.3.3 nodes fronting two PostgreSQL 9.2.7 
> nodes.
>
> We selected a table in pgAdmin3 and ran VACUUM with the ANALYZE 
> option.  Auto-vacuum is enabled on the database so the manual vacuum 
> is a bit nonsensical, but I still didn't expect a failure.
>
> The logging tells the story:
>
> 2014-08-19 13:56:53 LOG:   pid 7375: pool_send_and_wait: Error or 
> notice message from backend: : DB node id: 0 backend pid: 7404 
> statement: VACUUM VERBOSE ANALYZE sch.tbl message: vacuuming "sch.tbl"
> 2014-08-19 13:56:53 LOG:   pid 7375: pool_send_and_wait: Error or 
> notice message from backend: : DB node id: 1 backend pid: 314 
> statement: VACUUM VERBOSE ANALYZE sch.tbl message: vacuuming "sch.tbl"
> 2014-08-19 13:56:53 ERROR: pid 7375: read_kind_from_backend: 1 th kind 
> C does not match with master or majority connection kind N
> 2014-08-19 13:56:53 ERROR: pid 7375: kind mismatch among backends. 
> Possible last query was: "VACUUM VERBOSE ANALYZE sch.tbl" kind details 
> are: 0[N: "pg_toast_170592198": found 0 removable, 0 nonremovable row 
> versions in 0 out of 0 pages] 1[C]
> 2014-08-19 13:56:53 LOG:   pid 7375: degenerate_backend_set: 1 fail 
> over request from pid 7375
>
> Web searches for potential causes were not helpful.  Any ideas why 
> node 1 would just say "command completed" without all the other 
> information garbage that came from node 0?
>
> Thanks for any assistance,
>
> Sean
>
>
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