@Override
  public boolean isFileDeletable(FileStatus fStat) {
    return false;
  }
Base class for the log cleaning function inside the master. By default, three cleaners:
<code>TimeToLiveLogCleaner</code>, <code>TimeToLiveProcedureWALCleaner</code> and
<code>ReplicationLogCleaner</code> are called in order. So if other effects are needed, implement
your own LogCleanerDelegate and add it to the configuration "hbase.master.logcleaner.plugins",
which is a comma-separated list of fully qualified class names. LogsCleaner will add it to the
chain.
<p>
HBase ships with LogsCleaner as the default implementation.
<p>
This interface extends Configurable, so setConf needs to be called once before using the cleaner.
Since LogCleanerDelegates are created in LogsCleaner by reflection. Classes that implements this
interface should provide a default constructor.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/cleaner/BaseLogCleanerDelegate.java