[Bug] the method of `log` in Entrance can be lost log info

[guoshupei]

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• [X] I searched the issues and found no similar issues.

Linkis Component

linkis-computation-governance

Steps to reproduce

If the script is executed for more than 5 minutes, and the log is actively added, the previous log will be lost.

Expected behavior

Call the log method, we can get the log normally

Your environment

• Linkis version used: 1.1.1

Anything else

More than 5 minutes, the cachedLogs will write to hdfs . And execute fakeClear method that it set all element to null, but not reset the Attributes of flag, tail, realSize, so when realLog, it still read log from cachedLogs, but it empty. (默认超过5分钟，增加新日志会执行清除缓存并刷hdfs，但是清除缓存不会重置cachedLogs的flag, tail, realSize，所以当获取日志时，!sharedCache.cachedLogs.nonEmpty 不会为空，也就是不会从hdfs读取，还是从内存读取)

Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!

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[guoshupei]

How to understand the Attributes of flag, realSize in org.apache.linkis.entrance.log.LoopArray ?

[peacewong]

Hi guoshupei RealSize records the true size after the first ring, and if you want to read data that is less than realSize fromLine<realSize, you read it from the file

flag is used in conjunction with realSize to get the real position of index, for example, when index=9 and maxCapacity=5

array(4) value stores 4 more

tail=0 The next data that can be inserted is 0

flag 1 realSize-flag is always a multiple of 5 and is used to get the true index

realSize 6