> JDBC is sending "show transaction_read_only" to find whether it is master
> or not.
> Victor's patch also started with it, but later it was transformed into
> pg_is_in_recovery
> by him as it appeared more appropriate to identify the master / slave.

In my understanding pg_is_in_recovery() returns true if it's a standby
node. However, even if it returns other than true, the server is not
necessarily a primary. Even it's not configured as a streaming
replication primary, it returns other than true.

So if your intention is finding a primary, I am not sure if
pg_is_in_recovery() is the best solution.

Best regards,
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php

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