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Shaojin Wen
e98e4db75e
Connector/J parses a statement's SQL on every prepareStatement unless its per-connection parse cache is on, and that parse was the largest share of the control plane's Java CPU under load. The server and embedded MySQL pools now add cachePrepStmts=true, prepStmtCacheSize=512 and prepStmtCacheSqlLimit=8192 as connection properties. A connection property overrides the URL in Connector/J, so each setting is added only when neither the URL nor the Druid connection properties name it, ignoring case, percent-encoding and surrounding spaces. Nothing is added when either names useServerPrepStmts or useCursorFetch, since the cache would then hold statements open on the server. The server pool binds spring.datasource.druid inside its factory, before the defaults are added: @ConfigurationProperties bound it only after the factory returned, and the string form of connection-properties replaces every connection property.