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https://issues.apache.org/jira/browse/HDFS-14141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718273#comment-16718273
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Wei-Chiu Chuang commented on HDFS-14141:
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JvmPauseMonitor outputs in log messages, and log messages are not guaranteed to
be backward compatible. So I suggest make it the default (i.e. no extra flags)
https://hadoop.apache.org/docs/r3.1.0/hadoop-project-dist/hadoop-common/AdminCompatibilityGuide.html
bq. Note that any change to CLI tool output is considered an incompatible
change, so between major versions, the CLI output will not change. Note that
the CLI tool output is distinct from the log output produced by the CLI tools.
Log output is not intended for automated consumption and may change at any time.
> Enable GC monitoring thread for OIV tool
> ----------------------------------------
>
> Key: HDFS-14141
> URL: https://issues.apache.org/jira/browse/HDFS-14141
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.0.0
> Reporter: Siyao Meng
> Priority: Minor
>
> It took OIV quite a long time (84 minutes) to dump a 14G FSImage. I suspect
> there was a lot of GC going on. I think we could add an option like
> '-m,--gc-monitor' to enable GC monitoring thread for OIV tool.
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