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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