In Alluxio, I can monitor the leading master through port 19998. But I also want to monitor the standby master. However, the standby master does not have RPC port 19998. Is there any way to monitor the standby master? I want to monitor the status of the process and check whether the process is working properly. For example, I want to know whether the standby master reads journal timely. Thanks.
You can check whether the standby master is alive using jps or ps and looking for "AlluxioMaster"
jps | grep AlluxioMaster
ps ax | grep AlluxioMaster
The standby master's log (logs/master.log) will report when it reads each journal file. Note that the standby master only reads completed edit log files, not in-progress edit log files. By default, the edit log rolls over once it reaches 10MB.
These are some example standby master log messages:
2019-03-12 10:59:32,794 INFO UfsJournalReader - Reading journal file /opt/alluxio/journal/FileSystemMaster/v1/logs/0x0-0x223ff.
2019-03-12 10:59:43,425 INFO UfsJournalReader - Reading journal file /opt/alluxio/journal/FileSystemMaster/v1/logs/0x223ff-0x441f1.
2019-03-12 10:59:49,152 INFO UfsJournalReader - Reading journal file /opt/alluxio/journal/FileSystemMaster/v1/logs/0x441f1-0x65ee8.