Github user melrief commented on the issue:
https://github.com/apache/accumulo/pull/145
The new `KeyBuilderImpl` now keeps not only the byte arrays but also
offsets and lengths of each byte and each method now takes this offset and
length as optional parameters. In this way we are able to reuse byte arrays to
create `Key`s:
```java
byte[] keyBytes = new byte[] { 0, 1, 2, 3, 4, 5 }
Key key = Key.builder().row(keyBytes, 0, 2).column(keyBytes, 2,
2).qualifier(keyBytes, 4, 2).build();
```
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