[pgpool-general: 6620] Fwd: A lot of "checking zapping sent message" in log

[Vitaly Voronov]

Hi, all.

We uses PostgreSQL JDBC Driver 42.2.6 via pgpool-II version 4.0.5
(torokiboshi) on CentOS 7 (from pgpool repo -
pgpool-II-pg11.4.0.5-1pgdg.rhel7) for connecting to PostgreSQL 11 (from
postgresql.org repo - postgresql11-server.x86_64.11.3-1PGDG.rhel7).

We see a lot of messages in log file:
Jun 28 15:31:07 app1 pgpool[12527]: 2019-06-28 15:31:07: pid 15087: LOG:
 checking zapping sent message: 0x1ef8958 query_context: 0x1efc598
Jun 28 15:31:07 app1 pgpool[12527]: 2019-06-28 15:31:07: pid 15087: LOG:
 checking zapping sent message: 0x1ef8960 query_context: 0x1efe0a8
Jun 28 15:31:07 app1 pgpool[12527]: 2019-06-28 15:31:07: pid 15087: LOG:
 checking zapping sent message: 0x1ef8968 query_context: 0x1efb588
Jun 28 15:31:07 app1 pgpool[12527]: 2019-06-28 15:31:07: pid 15087: LOG:
 checking zapping sent message: 0x1ef8970 query_context: 0x1efb588
Jun 28 15:31:15 app1 pgpool[12527]: 2019-06-28 15:31:15: pid 14888: LOG:
 checking zapping sent message: 0x1ef8958 query_context: 0x1efb588
Jun 28 15:31:15 app1 pgpool[12527]: 2019-06-28 15:31:15: pid 14888: LOG:
 checking zapping sent message: 0x1ef8960 query_context: 0x1efad78
Jun 28 15:31:15 app1 pgpool[12527]: 2019-06-28 15:31:15: pid 14888: LOG:
 checking zapping sent message: 0x1ef8968 query_context: 0x1eff668
Jun 28 15:31:15 app1 pgpool[12527]: 2019-06-28 15:31:15: pid 14888: LOG:
 checking zapping sent message: 0x1ef8970 query_context: 0x1eff668
Jun 28 15:31:28 app1 pgpool[12527]: 2019-06-28 15:31:28: pid 15090: LOG:
 checking zapping sent message: 0x1ef8958 query_context: 0x1efd898
Jun 28 15:31:28 app1 pgpool[12527]: 2019-06-28 15:31:28: pid 15090: LOG:
 checking zapping sent message: 0x1ef8960 query_context: 0x1efd898

I've enabled all logging on pgpool, but we couldn't find any dependency
between executed query and messages in logs.

Can you explain situation, which can cause such messages?

With best regard, Vitaly.
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