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From "Raghu Angadi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-3082) setPermssion locks FSNamesystem for logSyc.
Date Mon, 24 Mar 2008 18:21:24 GMT
setPermssion locks FSNamesystem for logSyc.
-------------------------------------------

                 Key: HADOOP-3082
                 URL: https://issues.apache.org/jira/browse/HADOOP-3082
             Project: Hadoop Core
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.16.0
            Reporter: Raghu Angadi



{{FSNameSystem.setPermission()}} and other permission related calls lock FSNamesystem across
{{getEditLog().logSync()}} unlike other calls. This increases the negative effect of slower
disk on NameNode. Contrast {code}
  public synchronized void setPermission(String src, FsPermission permission
      ) throws IOException {
    checkOwner(src);
    dir.setPermission(src, permission);
    getEditLog().logSync();
  }{code}and {code}
  public boolean setReplication(String src, short replication) 
                                throws IOException {
    boolean status = setReplicationInternal(src, replication);
    getEditLog().logSync();
    return status;
  }
{code}


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