@Override
    public String toString() {
      return "AllocRecord(offset=" + this.offset + ", size=" + size + ")";
    }
After mslab close, jumboChunk is removed from {@link ChunkCreator#chunkIdMap} but because
dataChunk is recycled to pool so it is still in {@link ChunkCreator#chunkIdMap}.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestMemStoreLAB.java