JAVA调用mysql数据操作时出现错误:impossible to write to binary log since statement is in row format and BINLOG_FORMAT = STATEMENT.'
使用mysql做持久化报错:Cannot execute statement: impossible to write to binary log since BINLOG_FORM
ActiveMQ中如果使用mysql innodb的同时,开启了binlog,那么在ack消息的时候,日志里就可会报错:java.sql.SQLException: Cannot execute statement: binlogging impossible since BINLOG_FORMAT = STATEMENT and at least one table uses a storage engine limited to row-logging. InnoDB is limited to row-logging when transaction isolation level is READ COMMITTED or READ UNCOMMITTED.
这是因为,mysql默认的binlog_format是STATEMENT,而在READ COMMITTED或READ UNCOMMITTED隔离级别下,innodb只能使用的binlog_format是ROW。
而在ActiveMQ的store JDBC实现中(TransactionContext),为了提高并发性能,使用的是READ UNCOMMITTED:
- private int transactionIsolation = Connection.TRANSACTION_READ_UNCOMMITTED;
// a cheap dirty level that we can live with private int transactionIsolation = Connection.TRANSACTION_READ_UNCOMMITTED;所以,就会出现上面的问题。
解决办法有两个:
1、在mysql里设置binlog_format为ROW,此时binlog会增大,但是一般来说对数据复制支持的更好,建议单机高性能环境下使用。
2、在activemq.xml的jdbcPersistenceAdapter里配置transactionIsolation=“4”,即TRANSACTION_REPEATABLE_READ,此时事务更严格,会影响性能,建议在集群、强实时一致、不强调单机性能的情况下使用。
可以参见源码里的说明:
- * set the Transaction isolation level to something other that TRANSACTION_READ_UNCOMMITTED
- * This allowable dirty isolation level may not be achievable in clustered DB environments
- * so a more restrictive and expensive option may be needed like TRANSACTION_REPEATABLE_READ
- * see isolation level constants in {@link java.sql.Connection}
- * @param transactionIsolation the isolation level to use
- */
- public void setTransactionIsolation(int transactionIsolation) {
- this.transactionIsolation = transactionIsolation;
- }
/** * set the Transaction isolation level to something other that TRANSACTION_READ_UNCOMMITTED * This allowable dirty isolation level may not be achievable in clustered DB environments * so a more restrictive and expensive option may be needed like TRANSACTION_REPEATABLE_READ * see isolation level constants in {@link java.sql.Connection} * @param transactionIsolation the isolation level to use */ public void setTransactionIsolation(int transactionIsolation) { this.transactionIsolation = transactionIsolation; }