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b4710501dd
A new view in the experimental schema shows information related to chunk replication. The view can be used to learn the replication status of a chunk while also providing a way to easily find nodes to move or copy chunks between in order to ensure a fully replicated multi-node cluster. Tests have been added to illustrate the potential usage.
29 lines
1.4 KiB
SQL
29 lines
1.4 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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CREATE VIEW timescaledb_experimental.chunk_replication_status AS
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SELECT
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h.schema_name AS hypertable_schema,
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h.table_name AS hypertable_name,
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c.schema_name AS chunk_schema,
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c.table_name AS chunk_name,
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h.replication_factor AS desired_num_replicas,
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count(cdn.chunk_id) AS num_replicas,
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array_agg(cdn.node_name) AS replica_nodes,
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-- compute the set of data nodes that doesn't have the chunk
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(SELECT array_agg(node_name) FROM
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(SELECT node_name FROM _timescaledb_catalog.hypertable_data_node hdn
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WHERE hdn.hypertable_id = h.id
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EXCEPT
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SELECT node_name FROM _timescaledb_catalog.chunk_data_node cdn
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WHERE cdn.chunk_id = c.id
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ORDER BY node_name) nodes) AS non_replica_nodes
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FROM _timescaledb_catalog.chunk c
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INNER JOIN _timescaledb_catalog.chunk_data_node cdn ON (cdn.chunk_id = c.id)
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INNER JOIN _timescaledb_catalog.hypertable h ON (h.id = c.hypertable_id)
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GROUP BY h.id, c.id, hypertable_schema, hypertable_name, chunk_schema, chunk_name
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ORDER BY h.id, c.id, hypertable_schema, hypertable_name, chunk_schema, chunk_name;
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GRANT SELECT ON ALL TABLES IN SCHEMA timescaledb_experimental TO PUBLIC;
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