Using storage policy: s3_cache
-- { echo }

SET enable_filesystem_cache_on_write_operations=0;
DROP TABLE IF EXISTS test;
CREATE TABLE test (key UInt32, value String)
Engine=MergeTree()
ORDER BY key
SETTINGS storage_policy='s3_cache', min_bytes_for_wide_part = 10485760;
SYSTEM STOP MERGES;
SYSTEM DROP FILESYSTEM CACHE;
SELECT count() FROM system.filesystem_cache;
0
INSERT INTO test SELECT number, toString(number) FROM numbers(100);
SELECT * FROM test FORMAT Null;
SELECT count() FROM system.filesystem_cache;
2
SYSTEM DROP FILESYSTEM CACHE;
SELECT count() FROM system.filesystem_cache;
0
SELECT * FROM test FORMAT Null;
SELECT count() FROM system.filesystem_cache;
1
SYSTEM DROP FILESYSTEM CACHE './data'; -- { serverError 36 }
SELECT count() FROM system.filesystem_cache;
1
SELECT * FROM test FORMAT Null;
SELECT count() FROM system.filesystem_cache;
1
SELECT count()
FROM (
    SELECT
        arrayJoin(cache_paths) AS cache_path,
        local_path,
        remote_path
    FROM
        system.remote_data_paths
    ) AS data_paths
INNER JOIN system.filesystem_cache AS caches
ON data_paths.cache_path = caches.cache_path;
1
DROP TABLE test NO DELAY;
SELECT count() FROM system.filesystem_cache;
0
SELECT cache_path FROM system.filesystem_cache;
SELECT cache_path, local_path
FROM (
    SELECT
        arrayJoin(cache_paths) AS cache_path,
        local_path,
        remote_path
    FROM
        system.remote_data_paths
    ) AS data_paths
INNER JOIN system.filesystem_cache AS caches
ON data_paths.cache_path = caches.cache_path;
DROP TABLE IF EXISTS test2;
CREATE TABLE test2 (key UInt32, value String)
Engine=MergeTree()
ORDER BY key
SETTINGS storage_policy='s3_cache_2', min_bytes_for_wide_part = 10485760;
INSERT INTO test2 SELECT number, toString(number) FROM numbers(100);
SELECT * FROM test2 FORMAT Null;
SELECT count() FROM system.filesystem_cache;
2
SYSTEM DROP FILESYSTEM CACHE 's3_cache_2/';
SELECT count() FROM system.filesystem_cache;
0

Using storage policy: local_cache
-- { echo }

SET enable_filesystem_cache_on_write_operations=0;
DROP TABLE IF EXISTS test;
CREATE TABLE test (key UInt32, value String)
Engine=MergeTree()
ORDER BY key
SETTINGS storage_policy='local_cache', min_bytes_for_wide_part = 10485760;
SYSTEM STOP MERGES;
SYSTEM DROP FILESYSTEM CACHE;
SELECT count() FROM system.filesystem_cache;
0
INSERT INTO test SELECT number, toString(number) FROM numbers(100);
SELECT * FROM test FORMAT Null;
SELECT count() FROM system.filesystem_cache;
2
SYSTEM DROP FILESYSTEM CACHE;
SELECT count() FROM system.filesystem_cache;
0
SELECT * FROM test FORMAT Null;
SELECT count() FROM system.filesystem_cache;
1
SYSTEM DROP FILESYSTEM CACHE './data'; -- { serverError 36 }
SELECT count() FROM system.filesystem_cache;
1
SELECT * FROM test FORMAT Null;
SELECT count() FROM system.filesystem_cache;
1
SELECT count()
FROM (
    SELECT
        arrayJoin(cache_paths) AS cache_path,
        local_path,
        remote_path
    FROM
        system.remote_data_paths
    ) AS data_paths
INNER JOIN system.filesystem_cache AS caches
ON data_paths.cache_path = caches.cache_path;
1
DROP TABLE test NO DELAY;
SELECT count() FROM system.filesystem_cache;
0
SELECT cache_path FROM system.filesystem_cache;
SELECT cache_path, local_path
FROM (
    SELECT
        arrayJoin(cache_paths) AS cache_path,
        local_path,
        remote_path
    FROM
        system.remote_data_paths
    ) AS data_paths
INNER JOIN system.filesystem_cache AS caches
ON data_paths.cache_path = caches.cache_path;
DROP TABLE IF EXISTS test2;
CREATE TABLE test2 (key UInt32, value String)
Engine=MergeTree()
ORDER BY key
SETTINGS storage_policy='local_cache_2', min_bytes_for_wide_part = 10485760;
INSERT INTO test2 SELECT number, toString(number) FROM numbers(100);
SELECT * FROM test2 FORMAT Null;
SELECT count() FROM system.filesystem_cache;
2
SYSTEM DROP FILESYSTEM CACHE 'local_cache_2/';
SELECT count() FROM system.filesystem_cache;
0