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a75559aa36
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>
59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
#pragma once
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#include <Interpreters/SystemLog.h>
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#include <Common/ProfileEvents.h>
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#include <Common/CurrentMetrics.h>
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#include <Core/NamesAndTypes.h>
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#include <Core/NamesAndAliases.h>
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#include <vector>
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#include <atomic>
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#include <ctime>
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namespace DB
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{
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using AsynchronousMetricValue = double;
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using AsynchronousMetricValues = std::unordered_map<std::string, AsynchronousMetricValue>;
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/** AsynchronousMetricLog is a log of metric values measured at regular time interval.
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*/
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struct AsynchronousMetricLogElement
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{
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UInt16 event_date;
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time_t event_time;
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std::string metric_name;
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double value;
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static std::string name() { return "AsynchronousMetricLog"; }
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static NamesAndTypesList getNamesAndTypes();
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static NamesAndAliases getNamesAndAliases() { return {}; }
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void appendToBlock(MutableColumns & columns) const;
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/// Returns the list of columns as in CREATE TABLE statement or nullptr.
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/// If it's not nullptr, this list of columns will be used to create the table.
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/// Otherwise the list will be constructed from LogElement::getNamesAndTypes and LogElement::getNamesAndAliases.
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static const char * getCustomColumnList()
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{
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return "event_date Date CODEC(Delta(2), ZSTD(1)), "
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"event_time DateTime CODEC(Delta(4), ZSTD(1)), "
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"metric LowCardinality(String) CODEC(ZSTD(1)), "
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"value Float64 CODEC(Gorilla, ZSTD(3))";
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}
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};
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class AsynchronousMetricLog : public SystemLog<AsynchronousMetricLogElement>
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{
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public:
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using SystemLog<AsynchronousMetricLogElement>::SystemLog;
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void addValues(const AsynchronousMetricValues &);
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/// This table is usually queried for fixed metric name.
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static const char * getDefaultOrderBy() { return "(metric, event_date, event_time)"; }
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};
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}
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