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Avoid recreation of system.asynchronous_metric_log (due to difference in codec)

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From the log:

    2022.04.29 12:33:40.397528 [ 486 ] {} <Debug> SystemLog (system.asynchronous_metric_log): Existing table system.asynchronous_metric_log for system log has obsolete or different structure. Renaming it to asynchronous_metric_log_352.
    Old: CREATE TABLE system.asynchronous_metric_log (`event_date` Date CODEC(Delta(2), ZSTD(1)), `event_time` DateTime CODEC(Delta(4), ZSTD(1)), `metric` LowCardinality(String) CODEC(ZSTD(1)), `value` Float64 CODEC(Gorilla, ZSTD(3))) ENGINE = MergeTree PARTITION BY toYYYYMM(event_date) ORDER BY (metric, event_date, event_time) SETTINGS index_granularity = 8192
    New: CREATE TABLE system.asynchronous_metric_log (`event_date` Date CODEC(Delta(2), ZSTD), `event_time` DateTime CODEC(Delta(4), ZSTD), `metric` LowCardinality(String) CODEC(ZSTD), `value` Float64 CODEC(Gorilla, ZSTD(3))) ENGINE = MergeTree PARTITION BY toYYYYMM(event_date) ORDER BY (metric, event_date, event_time) SETTINGS index_granularity = 8192

As you can see the difference in default ZSTD level.

P.S. I decided not to fix the printer, since this may introduce changes
in metadata, that may lead to changes in metadata between ZooKeeper and
clickhouse server.

Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
This commit is contained in:
Azat Khuzhin 2022-04-30 12:17:22 +03:00
parent ceab14b9bb
commit a75559aa36
1 changed files with 3 additions and 3 deletions
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6
src/Interpreters/AsynchronousMetricLog.h
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@ -37,9 +37,9 @@ struct AsynchronousMetricLogElement
/// Otherwise the list will be constructed from LogElement::getNamesAndTypes and LogElement::getNamesAndAliases. /// Otherwise the list will be constructed from LogElement::getNamesAndTypes and LogElement::getNamesAndAliases.
static const char * getCustomColumnList() static const char * getCustomColumnList()
{ {
return "event_date Date CODEC(Delta(2), ZSTD), " return "event_date Date CODEC(Delta(2), ZSTD(1)), "
"event_time DateTime CODEC(Delta(4), ZSTD), " "event_time DateTime CODEC(Delta(4), ZSTD(1)), "
"metric LowCardinality(String) CODEC(ZSTD), " "metric LowCardinality(String) CODEC(ZSTD(1)), "
"value Float64 CODEC(Gorilla, ZSTD(3))"; "value Float64 CODEC(Gorilla, ZSTD(3))";
} }
}; };