Java client for Apache Druid

[iamtomkeen]

Apparently druidry is not maintained anymore.

Can anyone advise the best common approach to querying Druid from Java application at the moment?

[aleksi75]

At first I would recommend to use 'Druid SQL' and not 'Native queries', but in both cases you just send JSON to a REST endpoint (Broker).

Following a simple example with an 'org.eclipse.jetty.client.HttpClient'

public String callDruid() throws Exception {
    HttpClient httpClient = new HttpClient();
    httpClient.start();

    String result = "{}";   // emtpy JSON as default

    try {
        final String body = "{ \"query\" : \"SELECT * from your_datasource\ LIMIT 10" }";   // SQL Query  as JSON
        final String url = DRUID_BROKER_URL_INCL_PORT + "/druid/v2/sql";
        final Request request = httpClient.newRequest(url);

        request.timeout(60000, TimeUnit.MILLISECONDS);
        request.method(HttpMethod.POST);
        request.content(new BytesContentProvider(body.getBytes()), MediaType.APPLICATION_JSON_VALUE);
        request.header(HttpHeader.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);

        final ContentResponse response = request.send();

        if (HttpStatus.OK_200 == response.getStatus()) {
            result = response.getContentAsString();
        } else {
            LOGGER.warn("callDruid - query received unexpected response status " + response.getStatus() + " and content " + response.getContentAsString());
        }
    } catch (final InterruptedException | TimeoutException | ExecutionException e) {
        LOGGER.error("callDruid - query got exception processing call: " + e.getMessage(), e);
    }

    httpClient.stop();

    return result;
}

Note: This is not an issue, for questions like this better use Google Druid User Group.

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