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| <h2 title="Class ComputeResponseTool" class="title">Class ComputeResponseTool</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
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| <li>org.apache.hadoop.conf.Configured</li> |
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| <li>org.apache.pirk.responder.wideskies.mapreduce.ComputeResponseTool</li> |
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| <pre>public class <span class="typeNameLabel">ComputeResponseTool</span> |
| extends org.apache.hadoop.conf.Configured |
| implements org.apache.hadoop.util.Tool</pre> |
| <div class="block">Tool for computing the PIR response in MapReduce |
| <p> |
| Each query run consists of three MR jobs: |
| <p> |
| (1) Map: Initialization mapper reads data using an extension of the BaseInputFormat or elasticsearch and, according to the QueryInfo object, extracts the |
| selector from each dataElement according to the QueryType, hashes selector, and outputs <hash(selector), dataElement> |
| <p> |
| Reduce: Calculates the encrypted row values for each selector and corresponding data element, striping across columns,and outputs each row entry by column |
| position: <colNum, colVal> |
| <p> |
| (2) Map: Pass through mapper to aggregate by column number |
| <p> |
| Reduce: Input: <colnum, <colVals>>; multiplies all colVals according to the encryption algorithm and outputs <colNum, colVal> for each colNum |
| <p> |
| (3) Map: Pass through mapper to move all final columns to one reducer |
| <p> |
| Reduce: Creates the Response object |
| <P> |
| NOTE: If useHDFSExpLookupTable in the QueryInfo object is true, then the expLookupTable for the watchlist must be generated if it does not already exist in |
| hdfs. |
| <p> |
| TODO: |
| <p> |
| -Currently processes one query at time - can change to process multiple queries at the same time (under the same time interval and with same query |
| parameters) - using MultipleOutputs for extensibility to multiple queries per job later... |
| <p> |
| - Could place Query objects in DistributedCache (instead of a direct file based pull in task setup) |
| <p> |
| - Redesign exp lookup table to be smart and fully distributed/partitioned</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/pirk/responder/wideskies/mapreduce/ComputeResponseTool.html#ComputeResponseTool--">ComputeResponseTool</a></span>()</code> </td> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/pirk/responder/wideskies/mapreduce/ComputeResponseTool.html#run-java.lang.String:A-">run</a></span>(java.lang.String[] arg0)</code> </td> |
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| <h4>ComputeResponseTool</h4> |
| <pre>public ComputeResponseTool() |
| throws java.io.IOException, |
| <a href="../../../../../../org/apache/pirk/utils/PIRException.html" title="class in org.apache.pirk.utils">PIRException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code></dd> |
| <dd><code><a href="../../../../../../org/apache/pirk/utils/PIRException.html" title="class in org.apache.pirk.utils">PIRException</a></code></dd> |
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