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From Sabeer Hussain <>
Subject How to perform delta-import on SolrCloud mode through a scheduler?
Date Fri, 08 Dec 2017 09:40:49 GMT
I am using Solr 7.1 version and deployed it in standalone mode. I have
created a scheduler in my application itself to perform delta-import
operation based on a pre-configured frequency. I have used the following
lines of code (in java) to invoke delta-import operation
                URL url = new URL("http://localhost:8080/solr/mycorename");
                HttpURLConnection connection =
                if(connection != null )
                    connection.setRequestProperty ("Authorization",
                    connection.setConnectTimeout(10000);// 10 seconds
                    String data = URLEncoder.encode("command", "UTF-8") +
"=" + URLEncoder.encode("delta-import", "UTF-8");
                    data += "&" + URLEncoder.encode("optimize", "UTF-8") +
"=" + URLEncoder.encode("true", "UTF-8");
                    data += "&" + URLEncoder.encode("clean", "UTF-8") + "="
+ URLEncoder.encode("false", "UTF-8");
                    data += "&" + URLEncoder.encode("commit", "UTF-8") + "="
+ URLEncoder.encode("true", "UTF-8");
                     OutputStreamWriter out = new
                    BufferedReader in = new BufferedReader(
                                new InputStreamReader(

                    String decodedString;

                    while ((decodedString = in.readLine()) != null) {
                    in = null;
                    connection = null;
                    url = null;
Now, I want to deploy the application in SolrCloud mode and for each core,
there will be 2 more replicas. Each replica will be running on separate
server (say localhost:8983, localhost:8984,localhost:8985). So, my question
is, how I can use delta-import operation for my cores using my above code?
In the standlone mode, there is only core(s) and no replica available, so, I
can directly use that. On Cloud mode, whether I need to check for the active
node and create the URLConnection based on that or not. Is there any thing
from ZooKeeper that I can use (like SolrJ client). Another issue is that my
delta-import scheduler will be  available in all the three instances of my
application. So, how I can ensure that  delta-import operation will be
performed from one instance only.

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