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| <div class="subTitle">org.apache.drill.exec.planner.fragment</div> |
| <h2 title="Interface QueryParallelizer" class="title">Interface QueryParallelizer</h2> |
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| <dl> |
| <dt>All Superinterfaces:</dt> |
| <dd><a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html" title="interface in org.apache.drill.exec.planner.fragment">ParallelizationParameters</a></dd> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/drill/exec/planner/fragment/DefaultQueryParallelizer.html" title="class in org.apache.drill.exec.planner.fragment">DefaultQueryParallelizer</a>, <a href="../../../../../../org/apache/drill/exec/planner/fragment/QueueQueryParallelizer.html" title="class in org.apache.drill.exec.planner.fragment">QueueQueryParallelizer</a>, <a href="../../../../../../org/apache/drill/exec/planner/fragment/SimpleParallelizer.html" title="class in org.apache.drill.exec.planner.fragment">SimpleParallelizer</a>, <a href="../../../../../../org/apache/drill/exec/planner/fragment/contrib/SplittingParallelizer.html" title="class in org.apache.drill.exec.planner.fragment.contrib">SplittingParallelizer</a></dd> |
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| <pre>public interface <span class="typeNameLabel">QueryParallelizer</span> |
| extends <a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html" title="interface in org.apache.drill.exec.planner.fragment">ParallelizationParameters</a></pre> |
| <div class="block">Parallelizes the query plan. Once the optimizer finishes its job by producing a |
| optimized plan, it is the job of this parallelizer to generate a parallel plan out of the |
| optimized physical plan. It does so by using the optimizers estimates for row count etc. |
| There are two kinds of parallelizers as explained below. Currently the difference in |
| both of these parallelizers is only in the memory assignment for the physical operators. |
| <p> |
| a) Default Parallelizer: It optimistically assumes that the whole cluster is running only the |
| current query and based on heuristics assigns the optimal memory to the buffered operators. |
| <p> |
| b) Queue Parallelizer: This parallelizer computes the memory that can be allocated at best based |
| on the current cluster state(as to how much memory is available) and also the configuration |
| of the queue that it can run on.</div> |
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| <h3>Method Summary</h3> |
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| <td class="colFirst"><code><a href="../../../../../../org/apache/drill/exec/work/QueryWorkUnit.html" title="class in org.apache.drill.exec.work">QueryWorkUnit</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/drill/exec/planner/fragment/QueryParallelizer.html#generateWorkUnit-org.apache.drill.exec.server.options.OptionList-org.apache.drill.exec.proto.CoordinationProtos.DrillbitEndpoint-org.apache.drill.exec.proto.UserBitShared.QueryId-java.util.Collection-org.apache.drill.exec.planner.fragment.Fragment-org.apache.drill.exec.rpc.user.UserSession-org.apache.drill.exec.proto.BitControl.QueryContextInformation-">generateWorkUnit</a></span>(<a href="../../../../../../org/apache/drill/exec/server/options/OptionList.html" title="class in org.apache.drill.exec.server.options">OptionList</a> options, |
| <a href="../../../../../../org/apache/drill/exec/proto/CoordinationProtos.DrillbitEndpoint.html" title="class in org.apache.drill.exec.proto">CoordinationProtos.DrillbitEndpoint</a> foremanNode, |
| <a href="../../../../../../org/apache/drill/exec/proto/UserBitShared.QueryId.html" title="class in org.apache.drill.exec.proto">UserBitShared.QueryId</a> queryId, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/drill/exec/proto/CoordinationProtos.DrillbitEndpoint.html" title="class in org.apache.drill.exec.proto">CoordinationProtos.DrillbitEndpoint</a>> activeEndpoints, |
| <a href="../../../../../../org/apache/drill/exec/planner/fragment/Fragment.html" title="class in org.apache.drill.exec.planner.fragment">Fragment</a> rootFragment, |
| <a href="../../../../../../org/apache/drill/exec/rpc/user/UserSession.html" title="class in org.apache.drill.exec.rpc.user">UserSession</a> session, |
| <a href="../../../../../../org/apache/drill/exec/proto/BitControl.QueryContextInformation.html" title="class in org.apache.drill.exec.proto">BitControl.QueryContextInformation</a> queryContextInfo)</code> |
| <div class="block">This is the only function exposed to the consumer of this parallelizer (currently Foreman) to parallelize |
| the plan.</div> |
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| <h3>Methods inherited from interface org.apache.drill.exec.planner.fragment.<a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html" title="interface in org.apache.drill.exec.planner.fragment">ParallelizationParameters</a></h3> |
| <code><a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html#getAffinityFactor--">getAffinityFactor</a>, <a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html#getMaxGlobalWidth--">getMaxGlobalWidth</a>, <a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html#getMaxWidthPerNode--">getMaxWidthPerNode</a>, <a href="../../../../../../org/apache/drill/exec/planner/fragment/ParallelizationParameters.html#getSliceTarget--">getSliceTarget</a></code></li> |
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| <h4>generateWorkUnit</h4> |
| <pre><a href="../../../../../../org/apache/drill/exec/work/QueryWorkUnit.html" title="class in org.apache.drill.exec.work">QueryWorkUnit</a> generateWorkUnit(<a href="../../../../../../org/apache/drill/exec/server/options/OptionList.html" title="class in org.apache.drill.exec.server.options">OptionList</a> options, |
| <a href="../../../../../../org/apache/drill/exec/proto/CoordinationProtos.DrillbitEndpoint.html" title="class in org.apache.drill.exec.proto">CoordinationProtos.DrillbitEndpoint</a> foremanNode, |
| <a href="../../../../../../org/apache/drill/exec/proto/UserBitShared.QueryId.html" title="class in org.apache.drill.exec.proto">UserBitShared.QueryId</a> queryId, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><<a href="../../../../../../org/apache/drill/exec/proto/CoordinationProtos.DrillbitEndpoint.html" title="class in org.apache.drill.exec.proto">CoordinationProtos.DrillbitEndpoint</a>> activeEndpoints, |
| <a href="../../../../../../org/apache/drill/exec/planner/fragment/Fragment.html" title="class in org.apache.drill.exec.planner.fragment">Fragment</a> rootFragment, |
| <a href="../../../../../../org/apache/drill/exec/rpc/user/UserSession.html" title="class in org.apache.drill.exec.rpc.user">UserSession</a> session, |
| <a href="../../../../../../org/apache/drill/exec/proto/BitControl.QueryContextInformation.html" title="class in org.apache.drill.exec.proto">BitControl.QueryContextInformation</a> queryContextInfo) |
| throws <a href="../../../../../../org/apache/drill/common/exceptions/ExecutionSetupException.html" title="class in org.apache.drill.common.exceptions">ExecutionSetupException</a></pre> |
| <div class="block">This is the only function exposed to the consumer of this parallelizer (currently Foreman) to parallelize |
| the plan. The caller transforms the plan to a fragment tree and supplies the required information for |
| the parallelizer to do its job.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>options</code> - List of all options that are set for the current session.</dd> |
| <dd><code>foremanNode</code> - Endpoint information of the foreman node.</dd> |
| <dd><code>queryId</code> - Unique ID of the query.</dd> |
| <dd><code>activeEndpoints</code> - Currently active endpoints on which the plan can run.</dd> |
| <dd><code>rootFragment</code> - root of the fragment tree of the transformed physical plan</dd> |
| <dd><code>session</code> - user session object.</dd> |
| <dd><code>queryContextInfo</code> - query context.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Executable query plan which contains all the information like minor frags and major frags.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/drill/common/exceptions/ExecutionSetupException.html" title="class in org.apache.drill.common.exceptions">ExecutionSetupException</a></code></dd> |
| </dl> |
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