mirror of
https://github.com/ClickHouse/ClickHouse.git
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110 lines
5.5 KiB
C++
110 lines
5.5 KiB
C++
#pragma once
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#include <base/defines.h>
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#include <base/unit.h>
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namespace DB
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{
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static constexpr auto DBMS_DEFAULT_PORT = 9000;
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static constexpr auto DBMS_DEFAULT_SECURE_PORT = 9440;
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static constexpr auto DBMS_DEFAULT_CONNECT_TIMEOUT_SEC = 10;
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static constexpr auto DBMS_DEFAULT_SEND_TIMEOUT_SEC = 300;
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static constexpr auto DBMS_DEFAULT_RECEIVE_TIMEOUT_SEC = 300;
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/// Timeout for synchronous request-result protocol call (like Ping or TablesStatus).
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static constexpr auto DBMS_DEFAULT_SYNC_REQUEST_TIMEOUT_SEC = 5;
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static constexpr auto DBMS_DEFAULT_POLL_INTERVAL = 10;
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/// The size of the I/O buffer by default.
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static constexpr auto DBMS_DEFAULT_BUFFER_SIZE = 1048576ULL;
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static constexpr auto PADDING_FOR_SIMD = 64;
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/** Which blocks by default read the data (by number of rows).
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* Smaller values give better cache locality, less consumption of RAM, but more overhead to process the query.
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*/
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static constexpr auto DEFAULT_BLOCK_SIZE
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= 65409; /// 65536 - PADDING_FOR_SIMD - (PADDING_FOR_SIMD - 1) bytes padding that we usually have in = arrays
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/** Which blocks should be formed for insertion into the table, if we control the formation of blocks.
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* (Sometimes the blocks are inserted exactly such blocks that have been read / transmitted from the outside, and this parameter does not affect their size.)
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* More than DEFAULT_BLOCK_SIZE, because in some tables a block of data on the disk is created for each block (quite a big thing),
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* and if the parts were small, then it would be costly then to combine them.
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*/
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static constexpr auto DEFAULT_INSERT_BLOCK_SIZE
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= 1048449; /// 1048576 - PADDING_FOR_SIMD - (PADDING_FOR_SIMD - 1) bytes padding that we usually have in arrays
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static constexpr auto SHOW_CHARS_ON_SYNTAX_ERROR = ptrdiff_t(160);
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/// each period reduces the error counter by 2 times
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/// too short a period can cause errors to disappear immediately after creation.
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static constexpr auto DBMS_CONNECTION_POOL_WITH_FAILOVER_DEFAULT_DECREASE_ERROR_PERIOD = 60;
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/// replica error max cap, this is to prevent replica from accumulating too many errors and taking to long to recover.
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static constexpr auto DBMS_CONNECTION_POOL_WITH_FAILOVER_MAX_ERROR_COUNT = 1000;
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/// The boundary on which the blocks for asynchronous file operations should be aligned.
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static constexpr auto DEFAULT_AIO_FILE_BLOCK_SIZE = 4096;
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static constexpr auto DEFAULT_HTTP_READ_BUFFER_TIMEOUT = 30;
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static constexpr auto DEFAULT_HTTP_READ_BUFFER_CONNECTION_TIMEOUT = 1;
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/// Maximum number of http-connections between two endpoints
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/// the number is unmotivated
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static constexpr auto DEFAULT_COUNT_OF_HTTP_CONNECTIONS_PER_ENDPOINT = 15;
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static constexpr auto DEFAULT_TCP_KEEP_ALIVE_TIMEOUT = 290;
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static constexpr auto DEFAULT_HTTP_KEEP_ALIVE_TIMEOUT = 30;
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static constexpr auto DBMS_DEFAULT_PATH = "/var/lib/clickhouse/";
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/// Actually, there may be multiple acquisitions of different locks for a given table within one query.
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/// Check with IStorage class for the list of possible locks
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static constexpr auto DBMS_DEFAULT_LOCK_ACQUIRE_TIMEOUT_SEC = 120;
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/// Default limit on recursion depth of recursive descend parser.
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static constexpr auto DBMS_DEFAULT_MAX_PARSER_DEPTH = 1000;
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/// Default limit on query size.
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static constexpr auto DBMS_DEFAULT_MAX_QUERY_SIZE = 262144;
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/// Max depth of hierarchical dictionary
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static constexpr auto DBMS_HIERARCHICAL_DICTIONARY_MAX_DEPTH = 1000;
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/// Default maximum (total and entry) sizes and policies of various caches
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static constexpr auto DEFAULT_UNCOMPRESSED_CACHE_POLICY = "SLRU";
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static constexpr auto DEFAULT_UNCOMPRESSED_CACHE_MAX_SIZE = 0_MiB;
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static constexpr auto DEFAULT_UNCOMPRESSED_CACHE_SIZE_RATIO = 0.5l;
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static constexpr auto DEFAULT_MARK_CACHE_POLICY = "SLRU";
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static constexpr auto DEFAULT_MARK_CACHE_MAX_SIZE = 5368_MiB;
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static constexpr auto DEFAULT_MARK_CACHE_SIZE_RATIO = 0.5l;
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static constexpr auto DEFAULT_INDEX_UNCOMPRESSED_CACHE_POLICY = "SLRU";
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static constexpr auto DEFAULT_INDEX_UNCOMPRESSED_CACHE_MAX_SIZE = 0;
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static constexpr auto DEFAULT_INDEX_UNCOMPRESSED_CACHE_SIZE_RATIO = 0.5;
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static constexpr auto DEFAULT_INDEX_MARK_CACHE_POLICY = "SLRU";
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static constexpr auto DEFAULT_INDEX_MARK_CACHE_MAX_SIZE = 5368_MiB;
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static constexpr auto DEFAULT_INDEX_MARK_CACHE_SIZE_RATIO = 0.3;
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static constexpr auto DEFAULT_MMAP_CACHE_MAX_SIZE = 1_KiB; /// chosen by rolling dice
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static constexpr auto DEFAULT_COMPILED_EXPRESSION_CACHE_MAX_SIZE = 128_MiB;
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static constexpr auto DEFAULT_COMPILED_EXPRESSION_CACHE_MAX_ENTRIES = 10'000;
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static constexpr auto DEFAULT_QUERY_CACHE_MAX_SIZE = 1_GiB;
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static constexpr auto DEFAULT_QUERY_CACHE_MAX_ENTRIES = 1024uz;
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static constexpr auto DEFAULT_QUERY_CACHE_MAX_ENTRY_SIZE_IN_BYTES = 1_MiB;
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static constexpr auto DEFAULT_QUERY_CACHE_MAX_ENTRY_SIZE_IN_ROWS = 30'000'000uz;
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/// Query profiler cannot work with sanitizers.
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/// Sanitizers are using quick "frame walking" stack unwinding (this implies -fno-omit-frame-pointer)
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/// And they do unwinding frequently (on every malloc/free, thread/mutex operations, etc).
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/// They change %rbp during unwinding and it confuses libunwind if signal comes during sanitizer unwinding
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/// and query profiler decide to unwind stack with libunwind at this moment.
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///
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/// Symptoms: you'll get silent Segmentation Fault - without sanitizer message and without usual ClickHouse diagnostics.
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///
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/// Look at compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
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#if !defined(SANITIZER)
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static constexpr auto QUERY_PROFILER_DEFAULT_SAMPLE_RATE_NS = 1000000000;
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#else
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static constexpr auto QUERY_PROFILER_DEFAULT_SAMPLE_RATE_NS = 0;
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#endif
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}
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