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https://issues.apache.org/jira/browse/HDFS-14485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838519#comment-16838519
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Wei-Chiu Chuang commented on HDFS-14485:
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Ah. You're definitely right. I'll close it.
I don't really care about MiniDFSCluster. My use case is I want to load a big
fsimage with say 100 million files, and this thread takes up too much resources
walking through all files. It's not a problem in unit test.
> Optionally disable LazyPersistFileScrubber thread
> -------------------------------------------------
>
> Key: HDFS-14485
> URL: https://issues.apache.org/jira/browse/HDFS-14485
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Wei-Chiu Chuang
> Priority: Major
>
> NameNode automatically starts a LazyPersistFileScrubber thread to remove
> missing block files from namespace.
> However, for testing/dev purposes, if I simply want to load a NameNode with a
> fsimage, the thread would still kick off and consume CPU resources. That's
> quite annoying.
>
> I would like to propose an option to disable this thread if a developer knows
> exact what he/she is doing.
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