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| <h2 title="Interface Scheduler" class="title">Interface Scheduler</h2> |
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| <pre>public interface <span class="typeNameLabel">Scheduler</span></pre> |
| <div class="block">The scheduler describes the set of tasks to run. It provides the details |
| required to launch each task and optionally a specification of the containers |
| required to run the task. |
| <p> |
| Schedulers can manage batch task (which do their job and complete), or |
| persistent tasks (which run until terminated.) |
| <p> |
| The scheduler tracks task completion (for batch tasks) and task levels (for |
| persistent tasks.)</div> |
| </li> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Interface and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.TaskManager.html" title="interface in org.apache.drill.yarn.appMaster">Scheduler.TaskManager</a></span></code> </td> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#adjust--">adjust</a></span>()</code> |
| <div class="block">Adjust the number of running tasks to better track the desired number.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#change-int-">change</a></span>(int delta)</code> |
| <div class="block">Increase (positive) or decrease (negative) the number of desired tasks by |
| the given amount.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#completed-org.apache.drill.yarn.appMaster.Task-">completed</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a> task)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getName--">getName</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getProgress--">getProgress</a></span>()</code> |
| <div class="block">Return an estimate of progress given as a ratio of (work completed, total |
| work).</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getRequestTimeoutSec--">getRequestTimeoutSec</a></span>()</code> |
| <div class="block">Maximum amount of time to wait when cancelling a job in the REQUESTING |
| state.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/drill/yarn/core/ContainerRequestSpec.html" title="class in org.apache.drill.yarn.core">ContainerRequestSpec</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getResource--">getResource</a></span>()</code> |
| <div class="block">For reporting, get the YARN resources requested by processes in |
| this pool.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getTarget--">getTarget</a></span>()</code> |
| <div class="block">Get the desired number of running tasks.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.TaskManager.html" title="interface in org.apache.drill.yarn.appMaster">Scheduler.TaskManager</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getTaskManager--">getTaskManager</a></span>()</code> </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#getType--">getType</a></span>()</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#hasMoreTasks--">hasMoreTasks</a></span>()</code> |
| <div class="block">If this is a batch scheduler, whether all tasks for the batch have |
| completed.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#isTracked--">isTracked</a></span>()</code> |
| <div class="block">Whether tasks from this scheduler should incorporate app startup/shutdown |
| acknowledgements (acks) into the task lifecycle.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#limitContainerSize-org.apache.hadoop.yarn.api.records.Resource-">limitContainerSize</a></span>(org.apache.hadoop.yarn.api.records.Resource maxResource)</code> </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#registerState-org.apache.drill.yarn.appMaster.SchedulerState-">registerState</a></span>(<a href="../../../../../org/apache/drill/yarn/appMaster/SchedulerState.html" title="interface in org.apache.drill.yarn.appMaster">SchedulerState</a> state)</code> |
| <div class="block">Register the state object that tracks tasks launched by this scheduler.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#requestTimedOut--">requestTimedOut</a></span>()</code> |
| <div class="block">Informs the scheduler that a YARN resource request timed out.</div> |
| </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#resize-int-">resize</a></span>(int level)</code> |
| <div class="block">Set the number of desired tasks to the given level.</div> |
| </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#setPriority-int-">setPriority</a></span>(int priority)</code> |
| <div class="block">Controller-assigned priority for this scheduler.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h4>setPriority</h4> |
| <pre>void setPriority(int priority)</pre> |
| <div class="block">Controller-assigned priority for this scheduler. Used to differentiate |
| container requests by scheduler.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>priority</code> - </dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="registerState-org.apache.drill.yarn.appMaster.SchedulerState-"> |
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| <h4>registerState</h4> |
| <pre>void registerState(<a href="../../../../../org/apache/drill/yarn/appMaster/SchedulerState.html" title="interface in org.apache.drill.yarn.appMaster">SchedulerState</a> state)</pre> |
| <div class="block">Register the state object that tracks tasks launched by this scheduler.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>state</code> - </dd> |
| </dl> |
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| <h4>getName</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> getName()</pre> |
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| <h4>getType</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> getType()</pre> |
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| <h4>isTracked</h4> |
| <pre>boolean isTracked()</pre> |
| <div class="block">Whether tasks from this scheduler should incorporate app startup/shutdown |
| acknowledgements (acks) into the task lifecycle.</div> |
| </li> |
| </ul> |
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| </a> |
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| <h4>getTaskManager</h4> |
| <pre><a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.TaskManager.html" title="interface in org.apache.drill.yarn.appMaster">Scheduler.TaskManager</a> getTaskManager()</pre> |
| </li> |
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| <h4>getTarget</h4> |
| <pre>int getTarget()</pre> |
| <div class="block">Get the desired number of running tasks.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The desired number of running tasks</dd> |
| </dl> |
| </li> |
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| </a> |
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| <h4>change</h4> |
| <pre>void change(int delta)</pre> |
| <div class="block">Increase (positive) or decrease (negative) the number of desired tasks by |
| the given amount.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>delta</code> - </dd> |
| </dl> |
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| <pre>int resize(int level)</pre> |
| <div class="block">Set the number of desired tasks to the given level.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>level</code> - </dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the actual resize level, which may be lower than the requested |
| level if the system cannot provide the requested level</dd> |
| </dl> |
| </li> |
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| <pre>void completed(<a href="../../../../../org/apache/drill/yarn/appMaster/Task.html" title="class in org.apache.drill.yarn.appMaster">Task</a> task)</pre> |
| </li> |
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| <h4>adjust</h4> |
| <pre>void adjust()</pre> |
| <div class="block">Adjust the number of running tasks to better track the desired number. |
| Starts or stops tasks using the <a href="../../../../../org/apache/drill/yarn/appMaster/SchedulerState.html" title="interface in org.apache.drill.yarn.appMaster"><code>SchedulerState</code></a> registered with |
| <a href="../../../../../org/apache/drill/yarn/appMaster/Scheduler.html#registerState-org.apache.drill.yarn.appMaster.SchedulerState-"><code>registerState(SchedulerState)</code></a>.</div> |
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| <h4>getProgress</h4> |
| <pre>int[] getProgress()</pre> |
| <div class="block">Return an estimate of progress given as a ratio of (work completed, total |
| work).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Estimate of progress.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>hasMoreTasks</h4> |
| <pre>boolean hasMoreTasks()</pre> |
| <div class="block">If this is a batch scheduler, whether all tasks for the batch have |
| completed. If this is a persistent task scheduler, always returns false.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the scheduler has more tasks to run, false if the |
| scheduler has no more tasks or manages a set of long-running tasks</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getResource</h4> |
| <pre><a href="../../../../../org/apache/drill/yarn/core/ContainerRequestSpec.html" title="class in org.apache.drill.yarn.core">ContainerRequestSpec</a> getResource()</pre> |
| <div class="block">For reporting, get the YARN resources requested by processes in |
| this pool.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The request spec.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>void limitContainerSize(org.apache.hadoop.yarn.api.records.Resource maxResource) |
| throws <a href="../../../../../org/apache/drill/yarn/appMaster/AMException.html" title="class in org.apache.drill.yarn.appMaster">AMException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/drill/yarn/appMaster/AMException.html" title="class in org.apache.drill.yarn.appMaster">AMException</a></code></dd> |
| </dl> |
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| <pre>int getRequestTimeoutSec()</pre> |
| <div class="block">Maximum amount of time to wait when cancelling a job in the REQUESTING |
| state. YARN will happily wait forever for a resource, this setting |
| forcibly cancels the request at timeout.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of seconds to wait for timeout. 0 means no timeout</dd> |
| </dl> |
| </li> |
| </ul> |
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