public void runQuery() throws IOException {
MultigetSliceQuery<DataPointsRowKey, Integer, ByteBuffer> msliceQuery =
HFactory.createMultigetSliceQuery(
m_keyspace, ROW_KEY_SERIALIZER, IntegerSerializer.get(), ByteBufferSerializer.get());
msliceQuery.setColumnFamily(m_columnFamily);
msliceQuery.setKeys(m_rowKeys);
if (m_descending) msliceQuery.setRange(m_endTime, m_startTime, true, m_multiRowReadSize);
else msliceQuery.setRange(m_startTime, m_endTime, false, m_multiRowReadSize);
Rows<DataPointsRowKey, Integer, ByteBuffer> rows = msliceQuery.execute().get();
List<Row<DataPointsRowKey, Integer, ByteBuffer>> unfinishedRows =
new ArrayList<Row<DataPointsRowKey, Integer, ByteBuffer>>();
for (Row<DataPointsRowKey, Integer, ByteBuffer> row : rows) {
List<HColumn<Integer, ByteBuffer>> columns = row.getColumnSlice().getColumns();
if (!m_limit && columns.size() == m_multiRowReadSize) unfinishedRows.add(row);
writeColumns(row.getKey(), columns);
}
// Iterate through the unfinished rows and get the rest of the data.
// todo: use multiple threads to retrieve this data
for (Row<DataPointsRowKey, Integer, ByteBuffer> unfinishedRow : unfinishedRows) {
DataPointsRowKey key = unfinishedRow.getKey();
SliceQuery<DataPointsRowKey, Integer, ByteBuffer> sliceQuery =
HFactory.createSliceQuery(
m_keyspace, ROW_KEY_SERIALIZER, IntegerSerializer.get(), ByteBufferSerializer.get());
sliceQuery.setColumnFamily(m_columnFamily);
sliceQuery.setKey(key);
List<HColumn<Integer, ByteBuffer>> columns = unfinishedRow.getColumnSlice().getColumns();
do {
Integer lastTime = columns.get(columns.size() - 1).getName();
if (m_descending) sliceQuery.setRange(lastTime - 1, m_startTime, true, m_singleRowReadSize);
else sliceQuery.setRange(lastTime + 1, m_endTime, false, m_singleRowReadSize);
columns = sliceQuery.execute().get().getColumns();
writeColumns(key, columns);
} while (columns.size() == m_singleRowReadSize);
}
}
public List<byte[]> scan(
String startKey, String columnFamilyName, int maxRows) // throws IOException
{
List<byte[]> results = new ArrayList<byte[]>();
MultigetSliceQuery<String, String, byte[]> multigetSliceQuery =
HFactory.createMultigetSliceQuery(
this._keyspace,
StringSerializer.get(),
StringSerializer.get(),
BytesArraySerializer.get());
multigetSliceQuery.setColumnFamily(columnFamilyName);
multigetSliceQuery.setKeys(startKey);
multigetSliceQuery.setRange(startKey, "", false, maxRows);
QueryResult<Rows<String, String, byte[]>> queryResult = multigetSliceQuery.execute();
Rows<String, String, byte[]> rows = queryResult.get();
for (Row<String, String, byte[]> row : rows) {
boolean fail = true;
HColumn<String, byte[]> column = row.getColumnSlice().getColumnByName(DEFAULT_COLUMN_NAME);
if (column != null) {
byte[] value = column.getValue();
if (value != null) {
results.add(value);
fail = false;
/*
if (this._debug)
{
String key = rows.getKey();
if (this._failMap.containsKey(key))
{
System.out.println("Successful scan for previously failed key: " + key);
}
}
*/
}
}
if (fail) {
/*
if (this._debug)
{
String key = rows.getKey();
// Track the keys that fail and check whether we ever see a key for a value that failed before
if (this._failMap.containsKey(key))
{
int count = this._failMap.get(key);
count++;
this._failMap.put(key, count);
}
else
{
this._failMap.put(key, 1);
}
}
*/
}
}
return results;
}