Solr Trigger Optimize And Check Progress From Java Code

Question

From this topic there are two ways to trigger solr optimize from Java code.
Either sending an http request, or using solrj api.
But how to check the progress of it?
Say, an api which returns the progress of optimize in percentage
or strings like RUNNING/COMPLETED/FAILED.
Is there such an api?

Answer 1

Yes, optimize() in solrj api is a sync method.
Here is what I used to monitor the optimization progress.

CloudSolrClient client = null;
    try {
        client = new CloudSolrClient(zkClientUrl);
        client.setDefaultCollection(collectionName);
        m_logger.info("Explicit optimize of collection " + collectionName);
        long optimizeStart = System.currentTimeMillis();
        UpdateResponse optimizeResponse = client.optimize();

        for (Object object : optimizeResponse.getResponse()) {
            m_logger.info("Solr optimizeResponse" + object.toString());
        }
        if (optimizeResponse != null) {
            m_logger.info(String.format(
                    " Elapsed Time(in ms) - %d, QTime (in ms) - %d",
                    optimizeResponse.getElapsedTime(),
                    optimizeResponse.getQTime()));
        }
        m_logger.info(String.format(
                "Time spent on Optimizing a collection %s :"
                        + (System.currentTimeMillis() - optimizeStart)
                        / 1000 + " seconds", collectionName));
    } catch (Exception e) {
        m_logger.error("Failed during explicit optimize on collection "
                + collectionName, e);
    } finally {
        if (client != null) {
            try {
                client.close();
            } catch (IOException e) {
                throw new RuntimeException(
                        "Failed to close CloudSolrClient connection.", e);
            }
            client = null;
        }
    }