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Collect statistics about conflicts in logical replication.
This commit adds columns in view pg_stat_subscription_stats to show the
number of times a particular conflict type has occurred during the
application of logical replication changes. The following columns are
added:
confl_insert_exists:
Number of times a row insertion violated a NOT DEFERRABLE unique
constraint.
confl_update_origin_differs:
Number of times an update was performed on a row that was
previously modified by another origin.
confl_update_exists:
Number of times that the updated value of a row violates a
NOT DEFERRABLE unique constraint.
confl_update_missing:
Number of times that the tuple to be updated is missing.
confl_delete_origin_differs:
Number of times a delete was performed on a row that was
previously modified by another origin.
confl_delete_missing:
Number of times that the tuple to be deleted is missing.
The update_origin_differs and delete_origin_differs conflicts can be
detected only when track_commit_timestamp is enabled.
Author: Hou Zhijie
Reviewed-by: Shveta Malik, Peter Smith, Anit Kapila
Discussion: https://postgr.es/m/OS0PR01MB57160A07BD575773045FC214948F2@OS0PR01MB5716.jpnprd01.prod.outlook.com
This commit is contained in:
Amit Kapila
@ -1582,10 +1582,11 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
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</para>
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<para>
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Additional logging is triggered in the following <firstterm>conflict</firstterm>
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cases:
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Additional logging is triggered, and the conflict statistics are collected (displayed in the
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<link linkend="monitoring-pg-stat-subscription-stats"><structname>pg_stat_subscription_stats</structname></link> view)
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in the following <firstterm>conflict</firstterm> cases:
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<variablelist>
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<varlistentry>
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<varlistentry id="conflict-insert-exists" xreflabel="insert_exists">
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<term><literal>insert_exists</literal></term>
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<listitem>
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<para>
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@ -1598,7 +1599,7 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry id="conflict-update-origin-differs" xreflabel="update_origin_differs">
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<term><literal>update_origin_differs</literal></term>
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<listitem>
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<para>
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@ -1610,7 +1611,7 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry id="conflict-update-exists" xreflabel="update_exists">
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<term><literal>update_exists</literal></term>
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<listitem>
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<para>
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@ -1627,7 +1628,7 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry id="conflict-update-missing" xreflabel="update_missing">
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<term><literal>update_missing</literal></term>
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<listitem>
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<para>
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@ -1636,7 +1637,7 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry id="conflict-delete-origin-differs" xreflabel="delete_origin_differs">
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<term><literal>delete_origin_differs</literal></term>
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<listitem>
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<para>
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@ -1648,7 +1649,7 @@ test_sub=# SELECT * FROM t1 ORDER BY id;
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<varlistentry id="conflict-delete-missing" xreflabel="delete_missing">
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<term><literal>delete_missing</literal></term>
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<listitem>
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<para>
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@ -507,7 +507,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
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<row>
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<entry><structname>pg_stat_subscription_stats</structname><indexterm><primary>pg_stat_subscription_stats</primary></indexterm></entry>
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<entry>One row per subscription, showing statistics about errors.
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<entry>One row per subscription, showing statistics about errors and conflicts.
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See <link linkend="monitoring-pg-stat-subscription-stats">
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<structname>pg_stat_subscription_stats</structname></link> for details.
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</entry>
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@ -2157,7 +2157,10 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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<structfield>apply_error_count</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times an error occurred while applying changes
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Number of times an error occurred while applying changes. Note that any
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conflict resulting in an apply error will be counted in both
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<literal>apply_error_count</literal> and the corresponding conflict
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count (e.g., <literal>confl_*</literal>).
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</para></entry>
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</row>
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@ -2171,6 +2174,76 @@ description | Waiting for a newly initialized WAL file to reach durable storage
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>confl_insert_exists</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times a row insertion violated a
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<literal>NOT DEFERRABLE</literal> unique constraint during the
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application of changes. See <xref linkend="conflict-insert-exists"/>
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for details about this conflict.
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>confl_update_origin_differs</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times an update was applied to a row that had been previously
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modified by another source during the application of changes. See
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<xref linkend="conflict-update-origin-differs"/> for details about this
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conflict.
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>confl_update_exists</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times that an updated row value violated a
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<literal>NOT DEFERRABLE</literal> unique constraint during the
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application of changes. See <xref linkend="conflict-update-exists"/>
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for details about this conflict.
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>confl_update_missing</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times the tuple to be updated was not found during the
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application of changes. See <xref linkend="conflict-update-missing"/>
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for details about this conflict.
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>confl_delete_origin_differs</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times a delete operation was applied to row that had been
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previously modified by another source during the application of changes.
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See <xref linkend="conflict-delete-origin-differs"/> for details about
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this conflict.
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>confl_delete_missing</structfield> <type>bigint</type>
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</para>
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<para>
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Number of times the tuple to be deleted was not found during the application
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of changes. See <xref linkend="conflict-delete-missing"/> for details
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about this conflict.
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</para></entry>
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</row>
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<row>
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<entry role="catalog_table_entry"><para role="column_definition">
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<structfield>stats_reset</structfield> <type>timestamp with time zone</type>
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