融合：加载连接器后未创建主题

Question

我尝试连接到包括MySQL和MSSQL在内的多个数据库，但我没有遇到任何问题。

但是，当我尝试连接到某个远程MySQL数据库（只能从我公司的网络访问）时，该数据库包含一个具有近300万条记录的视图，该连接器已加载，并且Status表示该数据库正在运行，但是没有不会创建任何要使用其中的数据的主题。

可能是什么原因？在哪里可以找到正确的日志文件以了解发生了什么情况？

以下是连接器外观的示例：

{
  "name": "mysql-source",
   "config": {
   "connector.class": "io.confluent.connect.jdbc.JdbcSourceConnector",
   "key.converter": "io.confluent.connect.avro.AvroConverter",
   "key.converter.schema.registry.url": "http://localhost:8081",
   "value.converter": "io.confluent.connect.avro.AvroConverter",
   "value.converter.schema.registry.url": "http://localhost:8081",
   "incrementing.column.name": "Id",
   "tasks.max": "1",
   "table.types": "VIEW",
   "table.whitelist": "ticket_rep",
   "mode": "incrementing",
   "topic.prefix": "mysql-",
   "name": "mysql-source",
   "validate.non.null": "false",
   "connection.url": "jdbc:mysql://XX.XXX.XX.XX:3306/database? 
    user=user&password=password"
 }

}

这些是我运行融合日志连接时的日志结果：

> [2018-09-11 16:37:57,382] ERROR Failed to run query for table TimestampIncrementingTableQuerier{name='foo', query='null', topicPrefix='mysql-', timestampColumn='null', incrementingColumn='id'}: {} (io.confluent.connect.jdbc.source.JdbcSourceTask:247)
java.sql.SQLException: Java heap space
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
    at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:975)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeQuery(ClientPreparedStatement.java:1025)
    at io.confluent.connect.jdbc.source.TimestampIncrementingTableQuerier.executeQuery(TimestampIncrementingTableQuerier.java:201)
    at io.confluent.connect.jdbc.source.TableQuerier.maybeStartQuery(TableQuerier.java:84)
    at io.confluent.connect.jdbc.source.TimestampIncrementingTableQuerier.maybeStartQuery(TimestampIncrementingTableQuerier.java:55)
    at io.confluent.connect.jdbc.source.JdbcSourceTask.poll(JdbcSourceTask.java:225)
    at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:179)
    at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:170)
    at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:214)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
[2018-09-11 16:38:02,523] ERROR Failed to run query for table TimestampIncrementingTableQuerier{name='foo', query='null', topicPrefix='mysql-', timestampColumn='null', incrementingColumn='id'}: {} (io.confluent.connect.jdbc.source.JdbcSourceTask:247)
com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large (7,562,612 > 4,194,304). You can change this value on the server by setting the 'max_allowed_packet' variable.
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:107)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:975)
    at com.mysql.cj.jdbc.ClientPreparedStatement.executeQuery(ClientPreparedStatement.java:1025)
    at io.confluent.connect.jdbc.source.TimestampIncrementingTableQuerier.executeQuery(TimestampIncrementingTableQuerier.java:201)
    at io.confluent.connect.jdbc.source.TableQuerier.maybeStartQuery(TableQuerier.java:84)
    at io.confluent.connect.jdbc.source.TimestampIncrementingTableQuerier.maybeStartQuery(TimestampIncrementingTableQuerier.java:55)
    at io.confluent.connect.jdbc.source.JdbcSourceTask.poll(JdbcSourceTask.java:225)
    at org.apache.kafka.connect.runtime.WorkerSourceTask.execute(WorkerSourceTask.java:179)
    at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:170)
    at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:214)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

Answer 1

select * from SYS.SYSTRIGGERS --where trigdefn like '%exec%' 在MySQL方面是一个问题，可以通过增加com.mysql.cj.jdbc.exceptions.PacketTooBigException: Packet for query is too large变量的值来解决。为此，您需要添加

max_allowed_packet

在max_allowed_packet=512M （或my.cnf下，具体取决于您正在运行的操作系统）下的

文件（在my.ini部分内），然后重新启动MySQL。重新启动MySQL后，

[mysqld]

应返回您在MySQL配置文件中设置的值。有关此错误的更多详细信息，请参考MySQL documentation。


SHOW VARIABLES LIKE 'max_allowed_packet'; ，指示Kafka connect堆空间不足。可以通过运行

来控制起始堆大小和最大堆大小

java.sql.SQLException: Java heap space

设置起始堆大小为512 MB，最大大小为1 GB。您可能需要根据需要更改大小。