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25 lines
1.1 KiB
SQL
25 lines
1.1 KiB
SQL
-- Tags: no-parallel
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-- Tag no-parallel: to decrease failure probability of collecting stack traces
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-- Process one thread at a time
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SET max_block_size = 1;
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-- It is OK to have bigger timeout here since:
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-- a) this test is marked as no-parallel
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-- b) there is a filter by thread_name, so it will send signals only to the threads with the name TCPHandler
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-- c) max_block_size is 1
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SET storage_system_stack_trace_pipe_read_timeout_ms = 5000;
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-- { echo }
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SELECT count() > 0 FROM system.stack_trace WHERE query_id != '' AND thread_name = 'TCPHandler';
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-- opimization for not reading /proc/self/task/{}/comm and avoid sending signal
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SELECT countIf(thread_id > 0) > 0 FROM system.stack_trace;
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-- optimization for trace
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SELECT length(trace) > 0 FROM system.stack_trace WHERE length(trace) > 0 LIMIT 1;
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-- optimization for query_id
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SELECT length(query_id) > 0 FROM system.stack_trace WHERE query_id != '' AND thread_name = 'TCPHandler' LIMIT 1;
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-- optimization for thread_name
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SELECT length(thread_name) > 0 FROM system.stack_trace WHERE thread_name != '' LIMIT 1;
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-- enough rows (optimizations works "correctly")
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SELECT count() > 100 FROM system.stack_trace;
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