Note that this operation does not appear atomic to readers. Appends are done under a single row lock, so write operations to a row are synchronized, but readers do not take row locks so get and scan operations can see this operation partially completed.
To append to a set of columns of a row, instantiate an Append object with the row to append to. At least one column to append must be specified using the {@link #add(byte[],byte[],byte[])} method.
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