[jira] [Created] (HADOOP-14889) Suppress the fsnamesystem lock warning on nn startup

["Ajay Kumar (JIRA)" <ji...@apache.org>]

Ajay Kumar created HADOOP-14889:
-----------------------------------

             Summary: Suppress the fsnamesystem lock warning on nn startup
                 Key: HADOOP-14889
                 URL: https://issues.apache.org/jira/browse/HADOOP-14889
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Ajay Kumar


If FsNameSystemLock is held for more than 10 seconds then we log stacktrace . 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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