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| <h2 title="Enum Config.TopologyReliabilityMode" class="title">Enum Config.TopologyReliabilityMode</h2> |
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| <li>java.lang.Object</li> |
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| <li>java.lang.Enum<<a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a>></li> |
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| <ul class="inheritance"> |
| <li>org.apache.heron.api.Config.TopologyReliabilityMode</li> |
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| <dd><code>java.io.Serializable</code>, <code>java.lang.Comparable<<a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a>></code></dd> |
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| <dd><a href="Config.html" title="class in org.apache.heron.api">Config</a></dd> |
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| <hr> |
| <pre>public static enum <span class="typeNameLabel">Config.TopologyReliabilityMode</span> |
| extends java.lang.Enum<<a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a>></pre> |
| <div class="block">What is the reliability mode under which we are running this topology |
| Topology writers must set TOPOLOGY_RELIABILITY_MODE to one |
| one of the following modes</div> |
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| <th class="colFirst" scope="col">Enum Constant</th> |
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| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#ATLEAST_ONCE">ATLEAST_ONCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Heron guarantees that each emitted tuple is seen by the downstream components |
| atleast once.</div> |
| </td> |
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| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#ATMOST_ONCE">ATMOST_ONCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Heron provides no guarantees wrt tuple delivery.</div> |
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| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#EFFECTIVELY_ONCE">EFFECTIVELY_ONCE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">Heron guarantees that each emitted tuple is seen by the downstream components |
| effectively once.</div> |
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| <td class="colFirst"><code>static <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#valueOf(java.lang.String)">valueOf</a></span>​(java.lang.String name)</code></th> |
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| <div class="block">Returns the enum constant of this type with the specified name.</div> |
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| <td class="colFirst"><code>static <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a>[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#values()">values</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
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| <h4>ATMOST_ONCE</h4> |
| <pre>public static final <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a> ATMOST_ONCE</pre> |
| <div class="block">Heron provides no guarantees wrt tuple delivery. Tuples emitted by |
| components can get lost for any reason(network issues, component failures, |
| overloaded downstream component, etc).</div> |
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| <h4>ATLEAST_ONCE</h4> |
| <pre>public static final <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a> ATLEAST_ONCE</pre> |
| <div class="block">Heron guarantees that each emitted tuple is seen by the downstream components |
| atleast once. This is achieved via the anchoring process where emitted tuples |
| are anchored based on input tuples. Note that in failure scenarios, downstream |
| components can see the same tuple multiple times.</div> |
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| <h4>EFFECTIVELY_ONCE</h4> |
| <pre>public static final <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a> EFFECTIVELY_ONCE</pre> |
| <div class="block">Heron guarantees that each emitted tuple is seen by the downstream components |
| effectively once. This is achieved via distributed snapshotting approach is described at |
| https://docs.google.com/document/d/1pNuE77diSrYHb7vHPuPO3DZqYdcxrhywH_f7loVryCI/edit |
| In this mode Heron will try to take the snapshots of |
| all of the components of the topology every |
| TOPOLOGY_STATEFUL_CHECKPOINT_INTERVAL_SECONDS seconds. Upon failure of |
| any component or detection of any network failure, Heron will initiate a recovery |
| mechanism to revert the topology to the last globally consistent checkpoint</div> |
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| <h4>values</h4> |
| <pre class="methodSignature">public static <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (Config.TopologyReliabilityMode c : Config.TopologyReliabilityMode.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
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| <pre class="methodSignature">public static <a href="Config.TopologyReliabilityMode.html" title="enum in org.apache.heron.api">Config.TopologyReliabilityMode</a> valueOf​(java.lang.String name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if this enum type has no constant with the specified name</dd> |
| <dd><code>java.lang.NullPointerException</code> - if the argument is null</dd> |
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