mirror of https://github.com/citusdata/citus.git
48 lines
2.1 KiB
SQL
48 lines
2.1 KiB
SQL
SET search_path = 'pg_catalog';
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CREATE VIEW citus.citus_lock_waits AS
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WITH
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unique_global_wait_edges_with_calculated_gpids AS (
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SELECT
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-- if global_pid is NULL, it is most likely that a backend is blocked on a DDL
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-- also for legacy reasons citus_internal_global_blocked_processes() returns groupId, we replace that with nodeIds
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case WHEN waiting_global_pid !=0 THEN waiting_global_pid ELSE citus_calculate_gpid(get_nodeid_for_groupid(waiting_node_id), waiting_pid) END waiting_global_pid,
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case WHEN blocking_global_pid !=0 THEN blocking_global_pid ELSE citus_calculate_gpid(get_nodeid_for_groupid(blocking_node_id), blocking_pid) END blocking_global_pid,
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-- citus_internal_global_blocked_processes returns groupId, we replace it here with actual
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-- nodeId to be consisten with the other views
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get_nodeid_for_groupid(blocking_node_id) as blocking_node_id,
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get_nodeid_for_groupid(waiting_node_id) as waiting_node_id,
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blocking_transaction_waiting
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FROM citus_internal_global_blocked_processes()
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),
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unique_global_wait_edges AS
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(
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SELECT DISTINCT ON(waiting_global_pid, blocking_global_pid) * FROM unique_global_wait_edges_with_calculated_gpids
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),
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citus_dist_stat_activity_with_calculated_gpids AS
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(
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-- if global_pid is NULL, it is most likely that a backend is blocked on a DDL
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SELECT CASE WHEN global_pid != 0 THEN global_pid ELSE citus_calculate_gpid(nodeid, pid) END global_pid, nodeid, pid, query FROM citus_dist_stat_activity
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)
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SELECT
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waiting.global_pid as waiting_gpid,
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blocking.global_pid as blocking_gpid,
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waiting.query AS blocked_statement,
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blocking.query AS current_statement_in_blocking_process,
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waiting.nodeid AS waiting_nodeid,
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blocking.nodeid AS blocking_nodeid
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FROM
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unique_global_wait_edges
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JOIN
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citus_dist_stat_activity_with_calculated_gpids waiting ON (unique_global_wait_edges.waiting_global_pid = waiting.global_pid)
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JOIN
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citus_dist_stat_activity_with_calculated_gpids blocking ON (unique_global_wait_edges.blocking_global_pid = blocking.global_pid);
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ALTER VIEW citus.citus_lock_waits SET SCHEMA pg_catalog;
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GRANT SELECT ON pg_catalog.citus_lock_waits TO PUBLIC;
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RESET search_path;
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