public GetQueryResultResponse getResultResponse(QueryId queryId) throws ServiceException {
if (queryId.equals(QueryIdFactory.NULL_QUERY_ID)) {
return null;
}
NettyClientBase client = null;
try {
InetSocketAddress queryMasterAddr = queryMasterMap.get(queryId);
if (queryMasterAddr == null) {
LOG.warn("No Connection to QueryMaster for " + queryId);
return null;
}
client = connPool.getConnection(queryMasterAddr, QueryMasterClientProtocol.class, false);
QueryMasterClientProtocolService.BlockingInterface queryMasterService = client.getStub();
GetQueryResultRequest.Builder builder = GetQueryResultRequest.newBuilder();
builder.setQueryId(queryId.getProto());
GetQueryResultResponse response = queryMasterService.getQueryResult(null, builder.build());
return response;
} catch (Exception e) {
throw new ServiceException(e.getMessage(), e);
} finally {
connPool.releaseConnection(client);
}
}
public ResultSet getQueryResultAndWait(QueryId queryId) throws ServiceException, IOException {
if (queryId.equals(QueryIdFactory.NULL_QUERY_ID)) {
return createNullResultSet(queryId);
}
QueryStatus status = getQueryStatus(queryId);
while (status != null && isQueryRunnning(status.getState())) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
status = getQueryStatus(queryId);
}
if (status.getState() == QueryState.QUERY_SUCCEEDED) {
if (status.hasResult()) {
return getQueryResult(queryId);
} else {
return createNullResultSet(queryId);
}
} else {
LOG.warn("Query (" + status.getQueryId() + ") failed: " + status.getState());
// TODO throw SQLException(?)
return createNullResultSet(queryId);
}
}
public ResultSet getQueryResult(QueryId queryId) throws ServiceException, IOException {
if (queryId.equals(QueryIdFactory.NULL_QUERY_ID)) {
return createNullResultSet(queryId);
}
GetQueryResultResponse response = getResultResponse(queryId);
TableDesc tableDesc = CatalogUtil.newTableDesc(response.getTableDesc());
conf.setVar(ConfVars.USERNAME, response.getTajoUserName());
return new TajoResultSet(this, queryId, conf, tableDesc);
}
/**
* It submits a query statement and get a response. The main difference from {@link
* #executeQuery(String)} is a blocking method. So, this method is wait for the finish of the
* submitted query.
*
* @return If failed, return null.
*/
public ResultSet executeQueryAndGetResult(final String sql) throws ServiceException, IOException {
GetQueryStatusResponse response =
new ServerCallable<GetQueryStatusResponse>(
connPool, tajoMasterAddr, TajoMasterClientProtocol.class, false, true) {
public GetQueryStatusResponse call(NettyClientBase client) throws ServiceException {
final QueryRequest.Builder builder = QueryRequest.newBuilder();
builder.setQuery(sql);
TajoMasterClientProtocolService.BlockingInterface tajoMasterService = client.getStub();
return tajoMasterService.submitQuery(null, builder.build());
}
}.withRetries();
QueryId queryId = new QueryId(response.getQueryId());
if (queryId.equals(QueryIdFactory.NULL_QUERY_ID)) {
return this.createNullResultSet(queryId);
} else {
return this.getQueryResultAndWait(queryId);
}
}