sandynz opened a new issue, #19797:
URL: https://github.com/apache/shardingsphere/issues/19797
Related code in MySQLClient:
```
private void reconnect() {
reconnectTimes++;
log.info("reconnect mysql client, retryTimes={}",
reconnectTimes);
closeChannel();
connect();
subscribe(lastBinlogEvent.getFileName(),
lastBinlogEvent.getPosition());
}
public void closeChannel() {
if (null == channel || !channel.isOpen()) {
return;
}
try {
channel.close();
// CHECKSTYLE:OFF
} catch (final RuntimeException ex) {
// CHECKSTYLE:ON
log.error("close channel error", ex);
}
}
```
`channel.close();` will return `io.netty.channel.ChannelFuture`, but result
is ignored and there's no sync/await. So connect again might be occur before
old channel is closed.
Is it possible to cause issue?
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