Object key = new Object();
    Object value = new Object();
    int hash = map.hash(key);
    DummyEntry<Object, Object> entry = createDummyEntry(key, hash, value, null);
    segment.recordWrite(entry, 1, map.ticker.read());
    segment.table.set(0, entry);
    segment.readCount.incrementAndGet();
    segment.count = 1;
    segment.totalWeight = 1;

    assertSame(entry, table.get(0));

## Bug Fixes and Other Changes

*   Numerous C++ API updates.
*   New op: `parallel_stack`.
*   Introducing common tf io compression options constants for
    RecordReader/RecordWriter.
*   Add `sparse_column_with_vocabulary_file`, to specify a feature column that
    transform string features to IDs, where the mapping is defined by a
    vocabulary file.