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Midium: pgsql: Support multiple synchronous standby #1078

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Midium: pgsql: Support multiple synchronous standby #1078

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Commits on Jan 4, 2018

  1. Midium: pgsql: Support multiple synchronous replication: add a parameter 

    "sync_num" defines the number of synchronous standby nodes.
    @ytakeshita
    ytakeshita committed Jan 4, 2018
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  2. Midium: pgsql: Support multiple replication: expand the syntax of syn… 

    …chronous_standby_names in rep_mode.conf

Corresponding to the syntax of priority based multiple synchronous replication.
"synchronous_standby_names = 'sync_num (node_1, node_2, ..., node_n)'"
    @ytakeshita
    ytakeshita committed Jan 4, 2018
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  3. Midium: pgsql: Support multiple synchronous replication: control mast… 

    …er score for multiple "SYNC" slaves.

Set the weight for master score to distinguish some "SYNC" state slaves.
    @ytakeshita
    ytakeshita committed Jan 4, 2018
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  4. Fix: pgsql: Delete the temporary attribute value that remained unexpe… 

    …ctedly

When failover occures in multiple synchronous replication,
the temporary attribute "$PGSQL_XLOG_LOC_NAME" may remain
in the low priority SYNC node.
    @ytakeshita
    ytakeshita committed Jan 4, 2018
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