@Override
  public String toString() {
    return getClass() + "@" + System.identityHashCode(this)
        + " onBehalfOfRemoteStub:" + onBehalfOfRemoteStub;
  }
keeps track of TransactionDataRebalancedException during txPutEntry
geode-core/src/main/java/org/apache/geode/internal/cache/TXState.java