[GitHub] zhangxinyu1 opened a new pull request #6770: [FLINK-10002] [Webfrontend] WebUI shows jm/tm logs more friendly.

[GitBox <gi...@apache.org>]

zhangxinyu1 opened a new pull request #6770:  [FLINK-10002] [Webfrontend] WebUI shows jm/tm logs more friendly.
URL: https://github.com/apache/flink/pull/6770
 
 
   ## What is the purpose of the change
   This commit makes WebUI show jm/tm logs more friendly. WebUI can show historical logs by inputing a filename and a offset range to read of the file, shown as follows.
   ![image](https://user-images.githubusercontent.com/12528894/47417697-20b36b00-d768-11e8-8268-35990c08bc22.png)
   ![image](https://user-images.githubusercontent.com/12528894/47417728-30cb4a80-d768-11e8-82ee-94d39edca151.png)
   ![image](https://user-images.githubusercontent.com/12528894/47417747-388aef00-d768-11e8-86b9-ae7489742c20.png)
   ![image](https://user-images.githubusercontent.com/12528894/47417777-480a3800-d768-11e8-8652-c9f47a45c225.png)
   
   
   This pr adds 6 new REST APIs:
   
   - For JobManager
   `/jobmanager/log?filename=xxx&start=0&size=10240`    Return logs of the current log  file or a given file in the range.
   `/jobmanager/loglist`    Return the list of historical log filename.
   `/jobmanager/stdout?start=0&size=10240`    Return the stdout data in the range
   
   - For TaskManager
   `/taskmanagers/:taskmanagerid/log?filename=xxx&start=0&size=10240`    Return logs of the current log file or a given file in the range.
   `/taskmanagers/:taskmanagerid/loglist`    Return the list of historical log filename.
   `/taskmanagers/:taskmanagerid/stdout?start=0&size=10240`    Return the stdout data in the range
   
   ## Brief change log
   This pr mainly add 6 APIs in new (WebMonitorEndpoint) REST API. Besides, some related frontend codes are changed, such as
   
   1.  `JobManagerLogFileHandler` is used to handle the request to fetch stdout and log file of job manager. The related headers are `JobManagerLogFileHeaders` and `JobManagerStdoutFileHeaders`.
   2.  `JobManagerLogListHandler` is used to handle the request to fetch log list of job manager. The related header is `JobManagerLogListHeaders`, and return a `LogListInfo` value.
   3. `TaskManagerLogHandler` is used to handle the request to fetch stdout and log file of a given task manager. The related headers are `TaskManagerLogFileHeaders` and `TaskManagerStdoutFileHeaders`.
   4.  `TaskManagerLogListHandler` is used to handle the request to fetch log list of a given task manager. The related header is `TaskManagerLogListHeaders`.
   5.  `FileOffsetRange` is designed to identify a range of log files, which includes a start offset and an end offset. `LogFilenameQueryParameter`, `LogSizeQueryParameter` and `LogStartOffsetQueryParameter` are the parameters of requests.
   
   ## Verifying this change
   No tests.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no 
     - Anything that affects deployment or recovery: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? yes
     - If yes, how is the feature documented? JavaDocs
   
   

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