a1e8287265
The `global` parameter causes the time window defined by the `time` parameter to be applied at the instance level instead of the session level. This means that a write from one connection will cause all other connections to use the master for a certain period of time. Using a configurable time window for consistency is not good as it is not absolute and cannot adjust to how servers behave. One example that demonstrates this is when a slave is normally lagging behind by less than a second but some event causes the lag to spike up to several seconds. In this case the configured time window would no longer guarantee consistency. Another reason to avoid a "static" time window is the fact taht it prevents load balancing in the cases where slaves catch up to the master within time window. This happens when time is configured to a higher value to avoid inconsistencies at all costs. Added a test case that verified the feature works.
46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
/**
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* Test global mode for the CCRFilter
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*/
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#include "testconnections.h"
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int main(int argc, char* argv[])
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{
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TestConnections test(argc, argv);
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auto conn = test.maxscales->rwsplit();
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conn.connect();
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test.expect(conn.query("CREATE OR REPLACE TABLE test.t1 (a LONGTEXT)"),
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"Table creation should work: %s", conn.error());
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conn.disconnect();
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std::string data(1000000, 'a');
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auto secondary = test.maxscales->rwsplit();
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secondary.connect();
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for (int i = 0; i < 50; i++)
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{
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conn.connect();
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test.expect(conn.query("INSERT INTO test.t1 VALUES ('" + data + "')"),
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"INSERT should work: %s", conn.error());
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conn.disconnect();
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// New connections should see the inserted rows
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conn.connect();
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auto count = std::stoi(conn.field("SELECT COUNT(*) FROM test.t1"));
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test.expect(count == i + 1, "Missing `%d` rows.", (i + 1) - count);
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conn.disconnect();
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// Existing connections should also see the inserted rows
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auto second_count = std::stoi(secondary.field("SELECT COUNT(*) FROM test.t1"));
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test.expect(second_count == i + 1, "Missing `%d` rows from open connection.", (i + 1) - count);
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}
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conn.connect();
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test.expect(conn.query("DROP TABLE test.t1"),
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"Table creation should work: %s", conn.error());
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conn.disconnect();
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return test.global_result;
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}
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