tree 0b1a6dc7da0457afc7f3f62c795a33bfa960a68f
parent 85bbe534c007aed7ce316176c7adccbe6cbd21f1
author Hengfeng Li <hengfeng@google.com> 1584067433 +1100
committer Hengfeng Li <hengfeng@google.com> 1584568326 +0000

spanner: update the health check interval

This includes the following changes:

* adjust the default interval to 50 minutes.
* the first healthcheck is scheduled to
[interval*0.2, interval*1.1), i.e., [10, 55) mins.
* the non-first healthchecks are scheduled to
[interval*0.9, interval*1.1), so the new range will become [45, 55)
mins.
* add a separately sourced random generator in session pool.

Fixes #1817

Change-Id: I7dc612063815279b2f6a3b2b24c17ae6d52c14a2
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/53252
Reviewed-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Knut Olav Løite <koloite@gmail.com>