mirror of
https://github.com/ClickHouse/ClickHouse.git
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59 lines
2.4 KiB
Bash
59 lines
2.4 KiB
Bash
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#!/bin/bash
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# This script sets up export of system log tables to a remote server.
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# Remote tables are created if not exist, and augmented with extra columns,
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# and their names will contain a hash of the table structure,
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# which allows exporting tables from servers of different versions.
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# Pre-configured destination cluster, where to export the data
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CLUSTER=${CLUSTER:=system_logs_export}
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EXTRA_COLUMNS=${EXTRA_COLUMNS:="pull_request_number UInt32, commit_sha String, check_start_time DateTime, check_name LowCardinality(String), instance_type LowCardinality(String), "}
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EXTRA_COLUMNS_EXPRESSION=${EXTRA_COLUMNS_EXPRESSION:="0 AS pull_request_number, '' AS commit_sha, now() AS check_start_time, '' AS check_name, '' AS instance_type"}
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EXTRA_ORDER_BY_COLUMNS=${EXTRA_ORDER_BY_COLUMNS:="check_name, "}
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CONNECTION_PARAMETERS=${CONNECTION_PARAMETERS:=""}
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# For each system log table:
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clickhouse-client --query "SHOW TABLES FROM system LIKE '%\\_log'" | while read table
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do
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# Calculate hash of its structure:
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hash=$(clickhouse-client --query "
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SELECT sipHash64(groupArray((name, type)))
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FROM (SELECT name, type FROM system.columns
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WHERE database = 'system' AND table = '$table'
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ORDER BY position)
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")
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# Create the destination table with adapted name and structure:
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statement=$(clickhouse-client --format TSVRaw --query "SHOW CREATE TABLE system.${table}" | sed -r -e '
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s/^\($/('"$EXTRA_COLUMNS"'/;
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s/ORDER BY \(/ORDER BY ('"$EXTRA_ORDER_BY_COLUMNS"'/;
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s/^CREATE TABLE system\.\w+_log$/CREATE TABLE IF NOT EXISTS '"$table"'_'"$hash"'/;
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/^TTL /d
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')
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echo "Creating destination table ${table}_${hash}" >&2
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echo "$statement" | clickhouse-client $CONNECTION_PARAMETERS
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echo "Creating table system.${table}_sender" >&2
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# Create Distributed table and materialized view to watch on the original table:
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clickhouse-client --query "
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CREATE TABLE system.${table}_sender
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ENGINE = Distributed(${CLUSTER}, default, ${table}_${hash})
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EMPTY AS
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SELECT ${EXTRA_COLUMNS_EXPRESSION}, *
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FROM system.${table}
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"
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echo "Creating materialized view system.${table}_watcher" >&2
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clickhouse-client --query "
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CREATE MATERIALIZED VIEW system.${table}_watcher TO system.${table}_sender AS
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SELECT ${EXTRA_COLUMNS_EXPRESSION}, *
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FROM system.${table}
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"
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done
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