Postgres 11, receiving broken pipe, if stays inactive - postgresql

Question

Spring application is logging broken pipe occasionally. To deal with stale connections issue, application is already using -
testWhileIdle=true and validationQuery=SELECT 1
Stack trace -
Caused by: org.postgresql.util.PSQLException: An I/O error occurred while sending to the backend.
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:333)
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:441)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:365)
at org.postgresql.jdbc.PgPreparedStatement.executeWithFlags(PgPreparedStatement.java:155)
at org.postgresql.jdbc.PgPreparedStatement.executeQuery(PgPreparedStatement.java:118)
at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.jdbc.pool.StatementFacade$StatementProxy.invoke(StatementFacade.java:114)
at com.sun.proxy.$Proxy137.executeQuery(Unknown Source)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:70)
... 133 more
Caused by: java.net.SocketException: Connection reset
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:115)
at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at org.postgresql.core.PGStream.flush(PGStream.java:514)
at org.postgresql.core.v3.QueryExecutorImpl.sendSync(QueryExecutorImpl.java:1363)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:304)
... 143 more
Caused by java.net.SocketException: Broken pipe (Write failed)
A vague feeling, if application stays inactive for while, then it might be giving problem connecting to backend or vice-versa. But since can not reproduce this issue locally, it is hard to point.

Answer 1

You can try setting the timeout of idle connection higher.
idle_in_transaction_session_timeout = 30000
in postgresql.conf
But your error seems strange to me. I would probably check if you dont have way to many connection as well.
On the spring-boot side you could try adding the following properties:
spring.datasource.test-on-borrow=true
spring.datasource.validation-query=SELECT 1
spring.datasource.validation-interval=30000
you could try reducing the validation interval. I set it to the default one there
Hope it helps