private HTableDescriptor ensureTableExists(String tableName) throws StorageException {
HBaseAdmin adm = getAdminInterface();
HTableDescriptor desc;
try { // Create our table, if necessary
if (adm.tableExists(tableName)) {
desc = adm.getTableDescriptor(tableName.getBytes());
} else {
desc = new HTableDescriptor(tableName);
adm.createTable(desc);
}
} catch (IOException e) {
throw new TemporaryStorageException(e);
}
return desc;
}
/**
* 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);
}
}