/**
* Finds all the {@link Span}s that match this query. This is what actually scans the HBase table
* and loads the data into {@link Span}s.
*
* @return A map from HBase row key to the {@link Span} for that row key. Since a {@link Span}
* actually contains multiple HBase rows, the row key stored in the map has its timestamp
* zero'ed out.
* @throws HBaseException if there was a problem communicating with HBase to perform the search.
* @throws IllegalArgumentException if bad data was retreived from HBase.
*/
private TreeMap<byte[], Span> findSpans() throws HBaseException {
final short metric_width = tsdb.metrics.width();
final TreeMap<byte[], Span> spans = // The key is a row key from HBase.
new TreeMap<byte[], Span>(new SpanCmp(metric_width));
int nrows = 0;
int hbase_time = 0; // milliseconds.
long starttime = System.nanoTime();
final Scanner scanner = getScanner();
try {
ArrayList<ArrayList<KeyValue>> rows;
while ((rows = scanner.nextRows().joinUninterruptibly()) != null) {
hbase_time += (System.nanoTime() - starttime) / 1000000;
for (final ArrayList<KeyValue> row : rows) {
final byte[] key = row.get(0).key();
if (Bytes.memcmp(metric, key, 0, metric_width) != 0) {
throw new IllegalDataException(
"HBase returned a row that doesn't match"
+ " our scanner ("
+ scanner
+ ")! "
+ row
+ " does not start"
+ " with "
+ Arrays.toString(metric));
}
Span datapoints = spans.get(key);
if (datapoints == null) {
datapoints = new Span(tsdb);
spans.put(key, datapoints);
}
datapoints.addRow(tsdb.compact(row));
nrows++;
starttime = System.nanoTime();
}
}
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException("Should never be here", e);
} finally {
hbase_time += (System.nanoTime() - starttime) / 1000000;
scanlatency.add(hbase_time);
}
LOG.info(this + " matched " + nrows + " rows in " + spans.size() + " spans");
if (nrows == 0) {
return null;
}
return spans;
}
/** Method to call after writing the HTTP response to the wire. */
private void done() {
final int processing_time = processingTimeMillis();
httplatency.add(processing_time);
logInfo("HTTP " + getUri() + " done in " + processing_time + "ms");
deferred.callback(null);
}