mirror of
https://github.com/ClickHouse/ClickHouse.git
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61 lines
1.2 KiB
Bash
61 lines
1.2 KiB
Bash
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#!/usr/bin/env bash
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set -e
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CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
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. $CURDIR/../shell_config.sh
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$CLICKHOUSE_CLIENT --multiquery <<EOF
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DROP TABLE IF EXISTS src;
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DROP TABLE IF EXISTS mv;
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CREATE TABLE src(v UInt64) ENGINE = Null;
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CREATE MATERIALIZED VIEW mv(v UInt8) Engine = MergeTree() ORDER BY v AS SELECT v FROM src;
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EOF
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# Test that ALTER doesn't cause data loss or duplication.
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#
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# Idea for future:
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#
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# null
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# / \
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# mv1 mv2
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# \ /
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# \ /
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# mv sink
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#
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# Insert N times into null while altering sink query and switching it from mv1 to mv2.
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function alter_thread()
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{
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trap 'exit' INT
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ALTERS[0]="ALTER TABLE mv MODIFY QUERY SELECT v FROM src;"
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ALTERS[1]="ALTER TABLE mv MODIFY QUERY SELECT v * 2 as v FROM src;"
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while true; do
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$CLICKHOUSE_CLIENT --allow_experimental_alter_materialized_view_structure=1 -q "${ALTERS[$RANDOM % 2]}"
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sleep `echo 0.$RANDOM`;
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done
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}
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alter_thread &
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alter_pid=$!
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for i in $(seq 1 100); do
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(
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# Retry (hopefully retriable (deadlock avoided)) errors.
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until false; do
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$CLICKHOUSE_CLIENT -q "INSERT INTO src VALUES (1);" 2>/dev/null && break
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done
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)
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done
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# Enough alters.
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kill -INT $alter_pid
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wait
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# This was a fun ride.
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$CLICKHOUSE_CLIENT -q "SELECT count() FROM mv;"
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