[INLONG-101] Optimize code & Fix type

[dockerzhang]

1. Optimize code

if (addrMap4Failover.get(tmpNodeAddrInfo.getHostPortStr()) == null) {
addrMap4Failover.put(tmpNodeAddrInfo.getHostPortStr(), tmpNodeAddrInfo);
}

Change to

addrMap4Failover.putIfAbsent(tmpNodeAddrInfo.getHostPortStr(), tmpNodeAddrInfo);

2. Fix type
getParameteres -> getParameters
datestring -> dateString
setunFlushDataHold -> setUnflushDataHold
getunFlushDataHold -> getUnflushDataHold

Because I do n’t know whether it will affect other components, such as log parsing, etc., I did not change it here

.append(",\"unFlushDataHold\":").append(getUnflushDataHold())

JIRA link - [INLONG-101] created by viviel