Since ExternalLoader::PeriodicUpdater::check_period_sec = 5, and so if
it will be scheduled too early the reload will be skipped, and indeed
this is what you can see in logs [1], the reload is done each 10
seconds, not 5:
2021.01.31 14:20:22.590999 [ 48 ] {} <Trace> ExternalDictionariesLoader: Supposed update time for 'dep_x' is 2021-01-31 14:20:27 (loaded, lifetime [5, 5], no errors)
2021.01.31 14:20:22.591016 [ 48 ] {} <Trace> ExternalDictionariesLoader: Next update time for 'dep_x' was set to 2021-01-31 14:20:27
...
2021.01.31 14:20:32.164882 [ 50 ] {} <Trace> ExternalDictionariesLoader: Start loading object 'dep_x'
[1]: https://clickhouse-test-reports.s3.yandex.net/19584/37797fdf5b30dc97147e73b3ac8ca9025b80aaed/integration_tests_(release).html#fail1
* add the query data deduplication excluding duplicated parts in MergeTree family engines.
query deduplication is based on parts' UUID which should be enabled first with merge_tree setting
assign_part_uuids=1
allow_experimental_query_deduplication setting is to enable part deduplication, default ot false.
data part UUID is a mechanism of giving a data part a unique identifier.
Having UUID and deduplication mechanism provides a potential of moving parts
between shards preserving data consistency on a read path:
duplicated UUIDs will cause root executor to retry query against on of the replica explicitly
asking to exclude encountered duplicated fingerprints during a distributed query execution.
NOTE: this implementation don't provide any knobs to lock part and hence its UUID. Any mutations/merge will
update part's UUID.
* add _part_uuid virtual column, allowing to use UUIDs in predicates.
Signed-off-by: Aleksei Semiglazov <asemiglazov@cloudflare.com>
address comments
sed -i s'/^<test.*$/<test>/g' tests/performance/*.xml
WITH ceil(max(q[3]), 1) AS h
SELECT concat('sed -i s\'/^<test.*$/<test max_ignored_relative_change="', toString(h), '">/g\' tests/performance/', test, '.xml') AS s
FROM
(
SELECT
test,
query_index,
count(*),
min(event_time),
max(event_time) AS t,
arrayMap(x -> floor(x, 3), quantiles(0, 0.5, 0.95, 1)(stat_threshold)) AS q,
median(stat_threshold) AS m
FROM perftest.query_metrics_v2
WHERE ((pr_number != 0) AND (event_date > '2021-01-01')) AND (metric = 'client_time') AND (abs(diff) < 0.05) AND (old_value > 0.1)
GROUP BY
test,
query_index,
query_display_name
HAVING (t > '2021-01-01 00:00:00') AND ((q[3]) > 0.1)
ORDER BY test DESC
)
GROUP BY test
ORDER BY h DESC
FORMAT PrettySpace
