public void setTrackWroteKeys(boolean enable) {
    trackWroteKeys = enable;
  }
Used for a joint write/read workload. Enables tracking the last inserted/updated key, which
requires a blocking queue and a consumer thread.
@param enable whether to enable tracking the last inserted/updated key
hbase-diagnostics/src/main/java/org/apache/hadoop/hbase/util/MultiThreadedWriterBase.java