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https://issues.apache.org/jira/browse/HDFS-12516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179419#comment-16179419
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Ajay Kumar commented on HDFS-12516:
-----------------------------------
[~anu],[~arpitagarwal] thanks for review and commit.
> Suppress the fsnamesystem lock warning on nn startup
> ----------------------------------------------------
>
> Key: HDFS-12516
> URL: https://issues.apache.org/jira/browse/HDFS-12516
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ajay Kumar
> Assignee: Ajay Kumar
> Fix For: 3.1.0
>
> Attachments: HDFS-12516.01.patch, HDFS-12516.02.patch,
> HDFS-12516.03.patch
>
>
> Whenever FsNameSystemLock is held for more than configured value of
> {{dfs.namenode.write-lock-reporting-threshold-ms}}, we log stacktrace and an
> entry in metrics. Loading FSImage from disk will usually cross this
> threshold. We can suppress this FsNamesystem lock warning on NameNode startup.
> {code}
> 17/09/20 21:41:39 INFO namenode.FSNamesystem: FSNamesystem write lock held
> for 7159 ms via
> java.lang.Thread.getStackTrace(Thread.java:1552)
> org.apache.hadoop.util.StringUtils.getStackTrace(StringUtils.java:945)
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.writeUnlock(FSNamesystem.java:1659)
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1074)
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:703)
> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:688)
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:752)
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:992)
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:976)
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1701)
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1769)
> Number of suppressed write-lock reports: 0
> Longest write-lock held interval: 7159
> {code}
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