Jedis Pipeline - Understanding the working of Pipeline in GET operation

[Abhishek Patel]

Hi,

I just started using the Pipeline feature. Previously I evaluated performance of Pipeline for SET operation and it was quite amazing. So I decide to evaluate the performance of Pipeline in GET operation. To do this effectively, I want to understand the working of the Pipeline in GET operation. My code looks like this-




         List<Response<String>> lstofresponse = new ArrayList<Response<String>>();

         long loopstime = System.currentTimeMillis();
         for ( int k = 0; k < n; k++)
         {
            Response<String> r = pipeline.get(k+instanceid);
            lstofresponse.add(r);

         }
         long loopetime = System.currentTimeMillis();

         pipeline.sync();
         long execetime = System.currentTimeMillis();
        
         long valloopstime = System.currentTimeMillis();
         for(Response<String> r : lstofresponse)
         {
             String val = r.get();
         }
         long valloopetime = System.currentTimeMillis();
        
        
         System.out.println("Loop Time = " + (loopetime - loopstime));
         System.out.println("Execution Time = " + (execetime - loopetime));
         System.out.println("Val loop time = " + (valloopetime - valloopstime));

Output-

Loop Time = 21091
Execution Time = 3431
Val loop time = 10040
Get 10000000 in Time : 34563



Now, my question is, when I get the actual values for my keys from Redis, when statement ' pipeline.sync(); ' is executed or when I actually iterate over the List of Response and I write response.get() (as done in the second loop) ?

Thanks in advance

Abhishek Patel 

[Marcos Lilljedahl]

Hi Abhishek, 

The values are retrieved when the sync method is called. 

Cheers, 

Marcos.

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