private boolean rmLive(DiskEntry de) {
    if (isCompactionPossible()) {
      // Fix for 49898 - by synchronizing on the live entries, we ensure
      // that if the compaction thread does not find an entry in the live list,
      // it will also see an updated totalLiveCount.
      synchronized (liveEntries) {
        if (liveEntries.remove(de)) {
          totalLiveCount.decrementAndGet();
          return true;
        } else {
          return false;
        }
      }
    } else {
      totalLiveCount.decrementAndGet();
      return true;
    }
  }
The number of records in this oplog that contain the most recent value of the entry.
geode-core/src/main/java/org/apache/geode/internal/cache/OverflowOplog.java