void inactiveAccessed(Oplog oplog) {
    Long key = oplog.getOplogId();
    synchronized (getOplogIdToOplog()) {
      // update last access time
      inactiveOplogs.get(key);
    }
  }
Destroy all the oplogs that are:

<pre>
1. the oldest (based on smallest oplog id)
2. empty (have no live values)
</pre>
geode-core/src/main/java/org/apache/geode/internal/cache/PersistentOplogSet.java