ClickHouse/tests/queries/0_stateless/01019_alter_materialized_view_atomic.sh
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

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