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7 Commits (78fd021abd93453ca93734f3aa91a319cdff1675)

Author SHA1 Message Date
Onder Kalaci 6cd7319f12 Add more generic read-replica tests 2022-07-13 14:58:30 +02:00
Hanefi Onaldi 29e4516642 Introduce citus_check_cluster_node_health UDF 
This UDF coordinates connectivity checks accross the whole cluster.

This UDF gets the list of active readable nodes in the cluster, and
coordinates all connectivity checks in sequential order.

The algorithm is:

for sourceNode in activeReadableWorkerList:
    c = connectToNode(sourceNode)
    for targetNode in activeReadableWorkerList:
        result = c.execute(
            "SELECT citus_check_connection_to_node(targetNode.name,
                                                   targetNode.port")
        emit sourceNode.name,
             sourceNode.port,
             targetNode.name,
             targetNode.port,
             result

- result -> true  ->  connection attempt from source to target succeeded
- result -> false -> connection attempt from source to target failed
- result -> NULL  -> connection attempt from the current node to source node failed

I suggest you use the following query to get an overview on the connectivity:

SELECT bool_and(COALESCE(result, false))
FROM citus_check_cluster_node_health();

Whenever this query returns false, there is a connectivity issue, check in detail.
 2021-12-15 01:41:51 +03:00
Nils Dijk a748729998
rework ci 2020-12-18 18:04:45 +01:00
Sait Talha Nisanci 1b5ed45a58 add multi follower repartition tests 2020-07-13 19:50:50 +03:00
Jelte Fennema 7abedc38b0
Support subqueries in HAVING (#3098) 
Areas for further optimization:
- Don't save subquery results to a local file on the coordinator when the subquery is not in the having clause
- Push the the HAVING with subquery to the workers if there's a group by on the distribution column
- Don't push down the results to the workers when we don't push down the HAVING clause, only the coordinator needs it

Fixes #520
Fixes #756
Closes #2047
 2019-10-16 16:40:14 +02:00
Marco Slot 9e7b1fb858 Return readable nodes in master_get_active_worker_nodes 2017-08-16 11:28:47 +02:00
Marco Slot 59e626d158 Add regression tests for follower clusters 2017-08-12 12:05:56 +02:00