public void removeSingleElement(Object key, Element value) {
final Delete delete = new Delete(ByteArraySerializer.fromObject(key));
delete.deleteColumns(Bytes.toBytes(VALUES), (byte[]) value.getId());
try {
backingTable.delete(delete);
} catch (IOException e) {
LOG.severe("Cannot delete from backing table");
e.printStackTrace();
}
}
@Override
public Set<Element> remove(Object key) {
Delete del = new Delete(ByteArraySerializer.fromObject(key));
try {
backingTable.delete(del);
} catch (IOException e) {
LOG.severe("Error while deleting from table");
e.printStackTrace();
}
return null;
}
/**
* Deletes the specified table with all its columns. ATTENTION: Invoking this method will delete
* the table if it exists and therefore causes data loss.
*/
@Override
public void clearStorage() throws StorageException {
HBaseAdmin adm = getAdminInterface();
try { // first of all, check if table exists, if not - we are done
if (!adm.tableExists(tableName)) {
logger.debug("clearStorage() called before table {} was created, skipping.", tableName);
return;
}
} catch (IOException e) {
throw new TemporaryStorageException(e);
}
HTable table = null;
try {
table = new HTable(hconf, tableName);
Scan scan = new Scan();
scan.setBatch(100);
scan.setCacheBlocks(false);
scan.setCaching(2000);
ResultScanner scanner = null;
try {
scanner = table.getScanner(scan);
for (Result res : scanner) {
table.delete(new Delete(res.getRow()));
}
} finally {
IOUtils.closeQuietly(scanner);
}
} catch (IOException e) {
throw new TemporaryStorageException(e);
} finally {
IOUtils.closeQuietly(table);
}
}
