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libpq: Try next host if one of them times out.

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If one host in a multi-host connection string times out, move on to
the next specified host instead of giving up entirely.

Takayuki Tsunakawa, reviewed by Michael Paquier.  I added
a minor adjustment to the documentation.

Discussion: http://postgr.es/m/0A3221C70F24FB45833433255569204D1F6F42F5@G01JPEXMBYT05
This commit is contained in:
Robert Haas
2017-05-19 16:19:51 -04:00
parent aa41bc794c
commit 5f374fe7a8
3 changed files with 33 additions and 13 deletions
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7
doc/src/sgml/libpq.sgml
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@ -1041,9 +1041,10 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
string). Zero or not specified means wait indefinitely. It is not
recommended to use a timeout of less than 2 seconds.
This timeout applies separately to each connection attempt.
For example, if you specify two hosts and both of them are unreachable,
and <literal>connect_timeout</> is 5, the total time spent waiting for a
connection might be up to 10 seconds.
For example, if you specify two hosts and <literal>connect_timeout</>
is 5, each host will time out if no connection is made within 5
seconds, so the total time spent waiting for a connection might be
up to 10 seconds.
</para>
</listitem>
</varlistentry>