* @throws IOException
*/
private void rowAtOrBeforeFromStoreFile(final StoreFile f,
final GetClosestRowBeforeTracker state)
throws IOException {
Reader r = f.getReader();
if (r == null) {
LOG.warn("StoreFile " + f + " has a null Reader");
return;
}
// TODO: Cache these keys rather than make each time?
byte [] fk = r.getFirstKey();
KeyValue firstKV = KeyValue.createKeyValueFromKey(fk, 0, fk.length);
byte [] lk = r.getLastKey();
KeyValue lastKV = KeyValue.createKeyValueFromKey(lk, 0, lk.length);
KeyValue firstOnRow = state.getTargetKey();
if (this.comparator.compareRows(lastKV, firstOnRow) < 0) {
// If last key in file is not of the target table, no candidates in this
// file. Return.
if (!state.isTargetTable(lastKV)) return;
// If the row we're looking for is past the end of file, set search key to
// last key. TODO: Cache last and first key rather than make each time.
firstOnRow = new KeyValue(lastKV.getRow(), HConstants.LATEST_TIMESTAMP);
}
HFileScanner scanner = r.getScanner();
// Seek scanner. If can't seek it, return.
if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
// If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
// Unlikely that there'll be an instance of actual first row in table.
if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;