/** {@inheritDoc} */
@Override
public void createTable(TableLayoutDesc tableLayout, int numRegions) throws IOException {
Preconditions.checkArgument((numRegions >= 1), "numRegions must be positive: " + numRegions);
if (numRegions > 1) {
if (KijiTableLayout.getEncoding(tableLayout.getKeysFormat()) == RowKeyEncoding.RAW) {
throw new IllegalArgumentException(
"May not use numRegions > 1 if row key hashing is disabled in the layout");
}
createTable(
tableLayout,
KijiRowKeySplitter.get()
.getSplitKeys(numRegions, KijiRowKeySplitter.getRowKeyResolution(tableLayout)));
} else {
createTable(tableLayout, null);
}
}
/**
* Generate a list of start keys (one per region). Since we know that the row keys in kiji are
* byte strings of length 16, we can reliably split them evenly.
*
* @param numRegions The number of regions to generate start keys for.
* @return A list of start keys with size equal to <code>numRegions</code>.
*/
private static List<HFileKeyValue> generateEvenStartKeys(int numRegions) {
List<HFileKeyValue> startKeys = new ArrayList<HFileKeyValue>(numRegions);
// The first key is a special case, it must be empty.
startKeys.add(HFileKeyValue.createFromRowKey(HConstants.EMPTY_BYTE_ARRAY));
if (numRegions > 1) {
byte[][] splitKeys = KijiRowKeySplitter.get().getSplitKeys(numRegions);
for (byte[] hbaseRowKey : splitKeys) {
startKeys.add(HFileKeyValue.createFromRowKey(hbaseRowKey));
}
}
return startKeys;
}