一、环境:
1、版本：1.11.2
2、flink CDC 用Stream API 从mysql 同步到kudu
二、遇到的问题现象：
1、目前线上已经同步了几张mysql表到kudu了，mysql的量级都在3千万左右。
但是有一张mysql表同步了几次都遇到一个问题：大概能判断在全量阶段，还没到增量阶段。
错误日志在下面。目前想采取“autoReconnect=true”看看来避免，到是不应该加在哪个地方，看日志感觉加了这个参数也是治标不治本，重点是为啥不发送packet，造成了卡顿？
下面是具体报错：
======================================================
2020-11-24 20:00:37,547 *ERROR io.debezium.connector.mysql.SnapshotReader *
[] - Failed due to error: Aborting snapshot due to error when last running
'SELECT * FROM `uchome`.`forums_post_12`': *The last packet successfully
received from the server was 39 milliseconds ago. The last packet sent
successfully to the server was 6,772,615 milliseconds ago. is longer than
the server configured value of 'wait_timeout'. You should consider either
expiring and/or testing connection validity before use in your application,
increasing the server configured values for client timeouts, or using the
Connector/J connection property 'autoReconnect=true' to avoid this problem.*
org.apache.kafka.connect.errors.ConnectException: The last packet
successfully received from the server was 39 milliseconds ago. The last
packet sent successfully to the server was 6,772,615 milliseconds ago. is
longer than the server configured value of 'wait_timeout'. You should
consider either expiring and/or testing connection validity before use in
your application, increasing the server configured values for client
timeouts, or using the Connector/J connection property 'autoReconnect=true'
to avoid this problem. Error code: 0; SQLSTATE: 08S01.
at
io.debezium.connector.mysql.AbstractReader.wrap(AbstractReader.java:230)
~[blob_p-b339a2f89b058d1dab7e01f8c235b6bcc0c26d10-90c2b905e5c1a69c13cf6a9259bd7be8:?]
at
io.debezium.connector.mysql.AbstractReader.failed(AbstractReader.java:207)
~[blob_p-b339a2f89b058d1dab7e01f8c235b6bcc0c26d10-90c2b905e5c1a69c13cf6a9259bd7be8:?]
at
io.debezium.connector.mysql.SnapshotReader.execute(SnapshotReader.java:831)
~[blob_p-b339a2f89b058d1dab7e01f8c235b6bcc0c26d10-90c2b905e5c1a69c13cf6a9259bd7be8:?]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_231]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_231]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_231]
*Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: The last
packet successfully received from the server was 39 milliseconds ago. The
last packet sent successfully to the server was 6,772,615 milliseconds ago.
is longer than the server configured value of 'wait_timeout'. *You should
consider either expiring and/or testing connection validity before use in
your application, increasing the server configured values for client
timeouts, or using the Connector/J connection property 'autoReconnect=true'
to avoid this problem.
at
com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
~[blob_p-b339a2f89b058d1dab7e01f8c235b6bcc0c26d10-90c2b905e5c1a69c13cf6a9259bd7be8:?]
at
com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
~[blob_p-b339a2f89b058d1dab7e01f8c235b6bcc0c26d10-90c2b905e5c1a69c13cf6a9259bd7be8:?]
===============================================
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