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Posted to commits@helix.apache.org by jx...@apache.org on 2022/05/12 05:29:06 UTC
svn commit: r1900823 [5/22] - in /helix/site-content: ./ 0.9.9-docs/ 0.9.9-docs/css/ 0.9.9-docs/images/ 0.9.9-docs/js/ 0.9.9-docs/recipes/ 0.9.9-docs/releasenotes/ 1.0.2-docs/ 1.0.2-docs/css/ 1.0.2-docs/images/ 1.0.2-docs/js/ 1.0.2-docs/recipes/ 1.0.2-...
Modified: helix/site-content/1.0.3-docs/tutorial_distributed_lock.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_distributed_lock.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_distributed_lock.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_distributed_lock.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Distributed Lock</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_health.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_health.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_health.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_health.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Customizing Heath Checks</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_messaging.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_messaging.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_messaging.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_messaging.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Messaging</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_participant.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_participant.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_participant.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_participant.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Participant</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_propstore.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_propstore.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_propstore.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_propstore.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Application Property Store</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_rebalance.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_rebalance.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_rebalance.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_rebalance.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Rebalancing Algorithms</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
@@ -192,7 +192,7 @@ under the License.
<section>
<h3 id="FULL_AUTO">FULL_AUTO</h3>
<p>When the rebalance mode is set to FULL_AUTO, Helix controls both the location of the replica along with the state. This option is useful for applications where creation of a replica is not expensive.</p>
- <p>For example, consider this system that uses a MasterSlave state model, with 3 partitions and 2 replicas in the ideal state.</p>
+ <p>For example, consider this system that uses a LeaderStandby state model, with 3 partitions and 2 replicas in the ideal state.</p>
<div class="source">
<pre><code>{
"id" : "MyResource",
@@ -200,7 +200,7 @@ under the License.
"REBALANCE_MODE" : "FULL_AUTO",
"NUM_PARTITIONS" : "3",
"REPLICAS" : "2",
- "STATE_MODEL_DEF_REF" : "MasterSlave",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
}
"listFields" : {
"MyResource_0" : [],
@@ -212,27 +212,27 @@ under the License.
}
</code></pre>
</div>
- <p>If there are 3 nodes in the cluster, then Helix will balance the masters and slaves equally. The ideal state is therefore:</p>
+ <p>If there are 3 nodes in the cluster, then Helix will balance the leaders and standbys equally. The ideal state is therefore:</p>
<div class="source">
<pre><code>{
"id" : "MyResource",
"simpleFields" : {
"NUM_PARTITIONS" : "3",
"REPLICAS" : "2",
- "STATE_MODEL_DEF_REF" : "MasterSlave",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
},
"mapFields" : {
"MyResource_0" : {
- "N1" : "MASTER",
- "N2" : "SLAVE",
+ "N1" : "LEADER",
+ "N2" : "STANDBY",
},
"MyResource_1" : {
- "N2" : "MASTER",
- "N3" : "SLAVE",
+ "N2" : "LEADER",
+ "N3" : "STANDBY",
},
"MyResource_2" : {
- "N3" : "MASTER",
- "N1" : "SLAVE",
+ "N3" : "LEADER",
+ "N1" : "STANDBY",
}
}
}
@@ -243,7 +243,7 @@ under the License.
<section>
<h3 id="SEMI_AUTO">SEMI_AUTO</h3>
<p>When the application needs to control the placement of the replicas, use the SEMI_AUTO rebalance mode.</p>
- <p>Example: In the ideal state below, the partition 'MyResource_0' is constrained to be placed only on node1 or node2. The choice of <i>state</i> is still controlled by Helix. That means MyResource_0.MASTER could be on node1 and MyResource_0.SLAVE on node2, or vice-versa but neither would be placed on node3.</p>
+ <p>Example: In the ideal state below, the partition 'MyResource_0' is constrained to be placed only on node1 or node2. The choice of <i>state</i> is still controlled by Helix. That means MyResource_0.LEADER could be on node1 and MyResource_0.STANDBY on node2, or vice-versa but neither would be placed on node3.</p>
<div class="source">
<pre><code>{
"id" : "MyResource",
@@ -251,7 +251,7 @@ under the License.
"REBALANCE_MODE" : "SEMI_AUTO",
"NUM_PARTITIONS" : "3",
"REPLICAS" : "2",
- "STATE_MODEL_DEF_REF" : "MasterSlave",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
}
"listFields" : {
"MyResource_0" : [node1, node2],
@@ -263,13 +263,13 @@ under the License.
}
</code></pre>
</div>
- <p>The MasterSlave state model requires that a partition has exactly one MASTER at all times, and the other replicas should be SLAVEs. In this simple example with 2 replicas per partition, there would be one MASTER and one SLAVE. Upon failover, a SLAVE has to assume mastership, and a new SLAVE will be generated.</p>
- <p>In this mode when node1 fails, unlike in FULL_AUTO mode the partition is <i>not</i> moved from node1 to node3. Instead, Helix will decide to change the state of MyResource_0 on node2 from SLAVE to MASTER, based on the system constraints.</p>
+ <p>The LeaderStandby state model requires that a partition has exactly one LEADER at all times, and the other replicas should be STANDBYs. In this simple example with 2 replicas per partition, there would be one LEADER and one STANDBY. Upon failover, a STANDBY has to assume leadership, and a new STANDBY will be generated.</p>
+ <p>In this mode when node1 fails, unlike in FULL_AUTO mode the partition is <i>not</i> moved from node1 to node3. Instead, Helix will decide to change the state of MyResource_0 on node2 from STANDBY to LEADER, based on the system constraints.</p>
</section>
<section>
<h3 id="CUSTOMIZED">CUSTOMIZED</h3>
<p>Helix offers a third mode called CUSTOMIZED, in which the application controls the placement <i>and</i> state of each replica. The application needs to implement a callback interface that Helix invokes when the cluster state changes. Within this callback, the application can recompute the idealstate. Helix will then issue appropriate transitions such that <i>Idealstate</i> and <i>Currentstate</i> converges.</p>
- <p>Here's an example, again with 3 partitions, 2 replicas per partition, and the MasterSlave state model:</p>
+ <p>Here's an example, again with 3 partitions, 2 replicas per partition, and the LeaderStandby state model:</p>
<div class="source">
<pre><code>{
"id" : "MyResource",
@@ -277,26 +277,26 @@ under the License.
"REBALANCE_MODE" : "CUSTOMIZED",
"NUM_PARTITIONS" : "3",
"REPLICAS" : "2",
- "STATE_MODEL_DEF_REF" : "MasterSlave",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
},
"mapFields" : {
"MyResource_0" : {
- "N1" : "MASTER",
- "N2" : "SLAVE",
+ "N1" : "LEADER",
+ "N2" : "STANDBY",
},
"MyResource_1" : {
- "N2" : "MASTER",
- "N3" : "SLAVE",
+ "N2" : "LEADER",
+ "N3" : "STANDBY",
},
"MyResource_2" : {
- "N3" : "MASTER",
- "N1" : "SLAVE",
+ "N3" : "LEADER",
+ "N1" : "STANDBY",
}
}
}
</code></pre>
</div>
- <p>Suppose the current state of the system is âMyResource_0â -> {N1:MASTER, N2:SLAVE} and the application changes the ideal state to âMyResource_0â -> {N1:SLAVE,N2:MASTER}. While the application decides which node is MASTER and which is SLAVE, Helix will not blindly issue MASTER-->SLAVE to N1 and SLAVE-->MASTER to N2 in parallel, since that might result in a transient state where both N1 and N2 are masters, which violates the MasterSlave constraint that there is exactly one MASTER at a time. Helix will first issue MASTER-->SLAVE to N1 and after it is completed, it will issue SLAVE-->MASTER to N2.</p>
+ <p>Suppose the current state of the system is âMyResource_0â -> {N1:LEADER, N2:STANDBY} and the application changes the ideal state to âMyResource_0â -> {N1:STANDBY,N2:LEADER}. While the application decides which node is LEADER and which is STANDBY, Helix will not blindly issue LEADER-->STANDBY to N1 and STANDBY-->LEADER to N2 in parallel, since that might result in a transient state where both N1 and N2 are leaders, which violates the LeaderStandby constraint that there is exactly one LEADER at a time. Helix will first issue LEADER-->STANDBY to N1 and after it is completed, it will issue STANDBY-->LEADER to N2.</p>
</section>
<section>
<h3 id="USER_DEFINED">USER_DEFINED</h3>
Modified: helix/site-content/1.0.3-docs/tutorial_rest_service.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_rest_service.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_rest_service.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_rest_service.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - REST Service 2.0</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
@@ -391,9 +391,9 @@ curl http://localhost:12345/admin/v2/clu
<li><b>GET</b> - get the state model definition</li>
</ul>
<div class="source">
- <pre><code>$curl -X POST -H "Content-Type: application/json" http://localhost:1234/admin/v2/clusters/myCluster/statemodeldefs/MasterSlave
+ <pre><code>$curl -X POST -H "Content-Type: application/json" http://localhost:1234/admin/v2/clusters/myCluster/statemodeldefs/LeaderStandby
{
- "id" : "MasterSlave",
+ "id" : "STANDBY",
"simpleFields" : {
"INITIAL_STATE" : "OFFLINE"
},
@@ -408,34 +408,34 @@ curl http://localhost:12345/admin/v2/clu
"DROPPED" : "DROPPED",
"OFFLINE" : "OFFLINE"
},
- "MASTER.meta" : {
+ "LEADER.meta" : {
"count" : "1"
},
- "MASTER.next" : {
- "SLAVE" : "SLAVE",
- "DROPPED" : "SLAVE",
- "OFFLINE" : "SLAVE"
+ "LEADER.next" : {
+ "STANDBY" : "STANDBY",
+ "DROPPED" : "STANDBY",
+ "OFFLINE" : "STANDBY"
},
"OFFLINE.meta" : {
"count" : "-1"
},
"OFFLINE.next" : {
- "SLAVE" : "SLAVE",
- "MASTER" : "SLAVE",
+ "STANDBY" : "STANDBY",
+ "LEADER" : "STANDBY",
"DROPPED" : "DROPPED"
},
- "SLAVE.meta" : {
+ "STANDBY.meta" : {
"count" : "R"
},
- "SLAVE.next" : {
- "MASTER" : "MASTER",
+ "STANDBY.next" : {
+ "LEADER" : "LEADER",
"DROPPED" : "OFFLINE",
"OFFLINE" : "OFFLINE"
}
},
"listFields" : {
- "STATE_PRIORITY_LIST" : [ "MASTER", "SLAVE", "OFFLINE", "DROPPED", "ERROR" ],
- "STATE_TRANSITION_PRIORITYLIST" : [ "MASTER-SLAVE", "SLAVE-MASTER", "OFFLINE-SLAVE", "SLAVE-OFFLINE", "OFFLINE-DROPPED" ]
+ "STATE_PRIORITY_LIST" : [ "LEADER", "STANDBY", "OFFLINE", "DROPPED", "ERROR" ],
+ "STATE_TRANSITION_PRIORITYLIST" : [ "LEADER-STANDBY", "STANDBY-LEADER", "OFFLINE-STANDBY", "STANDBY-OFFLINE", "OFFLINE-DROPPED" ]
}
}
</code></pre>
@@ -518,7 +518,7 @@ curl http://localhost:12345/admin/v2/clu
,"NUM_PARTITIONS":"2"
,"REBALANCE_MODE":"SEMI_AUTO"
,"REPLICAS":"2"
- ,"STATE_MODEL_DEF_REF":"MasterSlave"
+ ,"STATE_MODEL_DEF_REF":"STANDBY"
}
,"listFields":{
"myResource_0":["host1", "host2"]
@@ -526,12 +526,12 @@ curl http://localhost:12345/admin/v2/clu
}
,"mapFields":{
"myResource_0":{
- "host1":"MASTER"
- ,"host2":"SLAVE"
+ "host1":"LEADER"
+ ,"host2":"STANDBY"
}
,"myResource_1":{
- "host1":"SLAVE"
- ,"host2":"MASTER"
+ "host1":"STANDBY"
+ ,"host2":"LEADER"
}
}
}
@@ -551,7 +551,7 @@ curl http://localhost:12345/admin/v2/clu
,"NUM_PARTITIONS":"2"
,"REBALANCE_MODE":"SEMI_AUTO"
,"REPLICAS":"2"
- ,"STATE_MODEL_DEF_REF":"MasterSlave"
+ ,"STATE_MODEL_DEF_REF":"STANDBY"
}
,"listFields":{
"myResource_0":["host1", "host2"]
@@ -559,12 +559,12 @@ curl http://localhost:12345/admin/v2/clu
}
,"mapFields":{
"myResource_0":{
- "host1":"MASTER"
+ "host1":"LEADER"
,"host2":"OFFLINE"
}
,"myResource_1":{
- "host1":"SLAVE"
- ,"host2":"MASTER"
+ "host1":"STANDBY"
+ ,"host2":"LEADER"
}
}
}
@@ -703,7 +703,7 @@ $curl -X POST -H "Content-Type: applicat
{
"id":"myResource1"
,"simpleFields":{
- "STATE_MODEL_DEF":"MasterSlave"
+ "STATE_MODEL_DEF":"STANDBY"
,"STATE_MODEL_FACTORY_NAME":"DEFAULT"
,"BUCKET_SIZE":"0"
,"SESSION_ID":"359619c2d7f109b"
@@ -712,19 +712,19 @@ $curl -X POST -H "Content-Type: applicat
}
,"mapFields":{
"myResource1_2":{
- "CURRENT_STATE":"SLAVE"
+ "CURRENT_STATE":"STANDBY"
,"INFO":""
}
,"myResource1_3":{
- "CURRENT_STATE":"MASTER"
+ "CURRENT_STATE":"LEADER"
,"INFO":""
}
,"myResource1_0":{
- "CURRENT_STATE":"MASTER"
+ "CURRENT_STATE":"LEADER"
,"INFO":""
}
,"myResource1_1":{
- "CURRENT_STATE":"SLAVE"
+ "CURRENT_STATE":"STANDBY"
,"INFO":""
}
}
Modified: helix/site-content/1.0.3-docs/tutorial_spectator.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_spectator.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_spectator.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_spectator.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Spectator</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_state.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_state.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_state.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_state.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - State Machine Configuration</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
@@ -193,8 +193,8 @@ under the License.
<p>In addition to the state machine configuration, one can specify the constraints of states and transitions.</p>
<p>For example, one can say:</p>
<ul>
- <li> <p>MASTER:1 <br>Maximum number of replicas in MASTER state at any time is 1</p> </li>
- <li> <p>OFFLINE-SLAVE:5 <br>Maximum number of OFFLINE-SLAVE transitions that can happen concurrently in the system is 5 in this example.</p> </li>
+ <li> <p>LEADER:1 <br>Maximum number of replicas in LEADER state at any time is 1</p> </li>
+ <li> <p>OFFLINE-STANDBY:5 <br>Maximum number of OFFLINE-STANDBY transitions that can happen concurrently in the system is 5 in this example.</p> </li>
</ul>
<section>
<h4 id="Dynamic_State_Constraints">Dynamic State Constraints</h4>
@@ -206,7 +206,7 @@ under the License.
</section>
<section>
<h4 id="State_Priority">State Priority</h4>
- <p>Helix uses a greedy approach to satisfy the state constraints. For example, if the state machine configuration says it needs 1 MASTER and 2 SLAVES, but only 1 node is active, Helix must promote it to MASTER. This behavior is achieved by providing the state priority list as [MASTER, SLAVE].</p>
+ <p>Helix uses a greedy approach to satisfy the state constraints. For example, if the state machine configuration says it needs 1 LEADER and 2 STANDBYS, but only 1 node is active, Helix must promote it to LEADER. This behavior is achieved by providing the state priority list as [LEADER, STANDBY].</p>
</section>
<section>
<h4 id="State_Transition_Priority">State Transition Priority</h4>
@@ -231,33 +231,33 @@ under the License.
</section>
<section>
<h3 id="Annotated_Example">Annotated Example</h3>
- <p>Below is a complete definition of a Master-Slave state model. Notice the fields marked REQUIRED; these are essential for any state model definition.</p>
+ <p>Below is a complete definition of a Leader-Standby state model. Notice the fields marked REQUIRED; these are essential for any state model definition.</p>
<div class="source">
- <pre><code>StateModelDefinition stateModel = new StateModelDefinition.Builder("MasterSlave")
+ <pre><code>StateModelDefinition stateModel = new StateModelDefinition.Builder("LeaderStandby")
// OFFLINE is the state that the system starts in (initial state is REQUIRED)
.initialState("OFFLINE")
// Lowest number here indicates highest priority, no value indicates lowest priority
- .addState("MASTER", 1)
- .addState("SLAVE", 2)
+ .addState("LEADER", 1)
+ .addState("STANDBY", 2)
.addState("OFFLINE")
// Note the special inclusion of the DROPPED state (REQUIRED)
.addState(HelixDefinedState.DROPPED.toString())
- // No more than one master allowed
- .upperBound("MASTER", 1)
+ // No more than one leader allowed
+ .upperBound("LEADER", 1)
// R indicates an upper bound of number of replicas for each partition
- .dynamicUpperBound("SLAVE", "R")
+ .dynamicUpperBound("STANDBY", "R")
// Add some high-priority transitions
- .addTransition("SLAVE", "MASTER", 1)
- .addTransition("OFFLINE", "SLAVE", 2)
+ .addTransition("STANDBY", "LEADER", 1)
+ .addTransition("OFFLINE", "STANDBY", 2)
// Using the same priority value indicates that these transitions can fire in any order
- .addTransition("MASTER", "SLAVE", 3)
- .addTransition("SLAVE", "OFFLINE", 3)
+ .addTransition("LEADER", "STANDBY", 3)
+ .addTransition("STANDBY", "OFFLINE", 3)
// Not specifying a value defaults to lowest priority
// Notice the inclusion of the OFFLINE to DROPPED transition
Modified: helix/site-content/1.0.3-docs/tutorial_task_framework.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_task_framework.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_task_framework.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_task_framework.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Task Framework</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_task_throttling.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_task_throttling.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_task_throttling.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_task_throttling.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Task Throttling</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_throttling.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_throttling.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_throttling.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_throttling.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Throttling</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
@@ -170,7 +170,7 @@ under the License.
<p>Helix allows applications to set a threshold on transitions. The threshold can be set at multiple scopes:</p>
<ul>
<li>MessageType e.g STATE_TRANSITION</li>
- <li>TransitionType e.g SLAVE-MASTER</li>
+ <li>TransitionType e.g STANDBY-LEADER</li>
<li>Resource e.g database</li>
<li>Node i.e per-node maximum transitions in parallel</li>
</ul>
Modified: helix/site-content/1.0.3-docs/tutorial_ui.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_ui.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_ui.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_ui.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - Helix UI Setup</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_user_content_store.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_user_content_store.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_user_content_store.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_user_content_store.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - User Defined Content Store for Tasks</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_user_def_rebalancer.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_user_def_rebalancer.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_user_def_rebalancer.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_user_def_rebalancer.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - User-Defined Rebalancing</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Modified: helix/site-content/1.0.3-docs/tutorial_yaml.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.3-docs/tutorial_yaml.html?rev=1900823&r1=1900822&r2=1900823&view=diff
==============================================================================
--- helix/site-content/1.0.3-docs/tutorial_yaml.html (original)
+++ helix/site-content/1.0.3-docs/tutorial_yaml.html Thu May 12 05:29:03 2022
@@ -7,7 +7,7 @@
<!--
- Generated by Apache Maven Doxia at 2022-04-25 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
-->
<html xml:lang="en" lang="en">
@@ -132,7 +132,7 @@
<li><a href="./" title="Release 1.0.3">Release 1.0.3</a></li>
<li class="divider">/</li>
<li>Tutorial - YAML Cluster Setup</li>
- <li class="publishDate version-date pull-right">Last Published: 2022-04-25</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
</ul>
</div>
</header>
Added: helix/site-content/1.0.5-docs/.htaccess
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.5-docs/.htaccess?rev=1900823&view=auto
==============================================================================
--- helix/site-content/1.0.5-docs/.htaccess (added)
+++ helix/site-content/1.0.5-docs/.htaccess Thu May 12 05:29:03 2022
@@ -0,0 +1,20 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+Redirect /download.html /download.cgi
Added: helix/site-content/1.0.5-docs/Building.html
URL: http://svn.apache.org/viewvc/helix/site-content/1.0.5-docs/Building.html?rev=1900823&view=auto
==============================================================================
--- helix/site-content/1.0.5-docs/Building.html (added)
+++ helix/site-content/1.0.5-docs/Building.html Thu May 12 05:29:03 2022
@@ -0,0 +1,279 @@
+
+<!DOCTYPE html>
+
+
+
+
+
+
+<!--
+ Generated by Apache Maven Doxia at 2022-05-11 Rendered using Reflow Maven Skin 2.0.0 (https://olamy.github.io/reflow-maven-skin)
+-->
+<html xml:lang="en" lang="en">
+
+ <head>
+ <meta charset="UTF-8" />
+ <title>Apache Helix – Build Instructions</title>
+ <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+ <meta name="description" content="" />
+ <meta http-equiv="content-language" content="en" />
+
+ <link href="./css/bootstrap.min.css" rel="stylesheet" />
+ <link href="./css/bootstrap-responsive.min.css" rel="stylesheet" />
+ <link href="./css/docs.css" rel="stylesheet" />
+ <link href="./css/reflow-skin.css" rel="stylesheet" />
+
+
+ <link href="./css/lightbox.css" rel="stylesheet" />
+
+ <link href="./css/site.css" rel="stylesheet" />
+ <link href="./css/print.css" rel="stylesheet" media="print" />
+
+ <!-- Le HTML5 shim, for IE6-8 support of HTML5 elements -->
+ <!--[if lt IE 9]>
+ <script src="./js/html5.js"></script>
+ <![endif]-->
+
+
+
+
+
+
+<!-- Matomo -->
+<script>
+ var _paq = window._paq = window._paq || [];
+ _paq.push(['disableCookies']);
+ _paq.push(['trackPageView']);
+ _paq.push(['enableLinkTracking']);
+
+ (function() {
+ var u="https://analytics.apache.org";
+ _paq.push(['setTrackerUrl', u+'/matomo.php']);
+ _paq.push(['setSiteId', '15']);
+ var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
+ g.async=true; g.src=u+'/matomo.js'; s.parentNode.insertBefore(g,s);
+ })();
+</script>
+<!-- End Matomo Code -->
+ </head>
+
+ <body class="page-building project-105-docs" data-spy="scroll" data-offset="60" data-target="#toc-scroll-target">
+
+
+ <div class="navbar navbar-fixed-top">
+ <div class="navbar-inner">
+ <div class="container">
+ <a class="btn btn-navbar" data-toggle="collapse" data-target="#top-nav-collapse">
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ </a>
+ <a class="brand" href="http://helix.apache.org">Apache Helix</a>
+ <div class="nav-collapse collapse" id="top-nav-collapse">
+ <ul class="nav pull-right">
+ <li ><a href="index.html" title="Helix 1.0.4">Helix 1.0.4</a></li>
+ <li class="dropdown active">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Get Helix <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li ><a href="download.html" title="Download">Download</a></li>
+ <li class="active"><a href="" title="Building">Building</a></li>
+ <li ><a href="releasenotes/release-1.0.4.html" title="Release Notes">Release Notes</a></li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Hands-On <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li ><a href="Quickstart.html" title="Quick Start">Quick Start</a></li>
+ <li ><a href="Tutorial.html" title="Tutorial">Tutorial</a></li>
+ <li ><a href="../javadocs/1.0.4" title="Javadocs">Javadocs</a></li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Recipes <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li ><a href="recipes/lock_manager.html" title="Distributed lock manager">Distributed lock manager</a></li>
+ <li ><a href="recipes/rabbitmq_consumer_group.html" title="Rabbit MQ consumer group">Rabbit MQ consumer group</a></li>
+ <li ><a href="recipes/rsync_replicated_file_store.html" title="Rsync replicated file store">Rsync replicated file store</a></li>
+ <li ><a href="recipes/service_discovery.html" title="Service discovery">Service discovery</a></li>
+ <li ><a href="recipes/task_dag_execution.html" title="Distributed task DAG execution">Distributed task DAG execution</a></li>
+ </ul>
+ </li>
+ </ul>
+ </div><!--/.nav-collapse -->
+ </div>
+ </div>
+ </div>
+
+ <div class="container">
+
+ <!-- Masthead
+ ================================================== -->
+
+ <header>
+ <div class="jumbotron subhead">
+ <div class="row" id="banner">
+ <div class="span12">
+ <div class="pull-left">
+ <a href="http://helix.apache.org/" id="bannerLeft"><img src="../images/helix-logo.jpg" alt='"''"' /></a>
+ <p class="lead">A cluster management framework for partitioned and replicated distributed resources</p>
+ </div>
+ <div class="pull-right">
+ <a href="http://www.apache.org/" id="bannerRight"><img src="../images/feather_small.gif" alt='"''"' /></a>
+ </div>
+ </div>
+ </div>
+ </div>
+ <div>
+ <ul class="breadcrumb">
+ <li><a href="http://helix.apache.org/" title="Apache Helix" class="externalLink">Apache Helix</a></li>
+ <li class="divider">/</li>
+ <li><a href="../" title="Apache Helix">Apache Helix</a></li>
+ <li class="divider">/</li>
+ <li><a href="../1.0.4-docs/" title="Release 1.0.4">Release 1.0.4</a></li>
+ <li class="divider">/</li>
+ <li>Build Instructions</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
+ </ul>
+ </div>
+ </header>
+
+ <div class="main-body">
+ <div class="row">
+ <div class="span12">
+ <div class="body-content">
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+<section>
+ <div class="page-header">
+ <h2 id="Build_Instructions">Build Instructions</h2>
+ </div>
+ <section>
+ <h3 id="From_Source">From Source</h3>
+ <p>Requirements: JDK 1.8+, Maven 3.5.0+</p>
+ <div class="source">
+ <pre><code>git clone https://git-wip-us.apache.org/repos/asf/helix.git
+cd helix
+git checkout tags/helix-1.0.4
+mvn install package -DskipTests
+</code></pre>
+ </div>
+ </section>
+ <section>
+ <h3 id="Maven_Dependency">Maven Dependency</h3>
+ <div class="source">
+ <pre><code><dependency>
+ <groupId>org.apache.helix</groupId>
+ <artifactId>helix-core</artifactId>
+ <version>1.0.4</version>
+</dependency>
+</code></pre>
+ </div>
+ </section>
+</section>
+ </div>
+ </div>
+ </div>
+ </div>
+
+ </div><!-- /container -->
+
+ <!-- Footer
+ ================================================== -->
+ <footer class="well">
+ <div class="container">
+ <div class="row">
+ <div class="span3 bottom-nav">
+ <ul class="nav nav-list">
+ <li class="nav-header">Get Helix</li>
+ <li >
+ <a href="download.html" title="Download">Download</a>
+ </li>
+ <li class="active">
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+ </li>
+ <li >
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+ </li>
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+ <div class="span3 bottom-nav">
+ <ul class="nav nav-list">
+ <li class="nav-header">Hands-On</li>
+ <li >
+ <a href="Quickstart.html" title="Quick Start">Quick Start</a>
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+ <ul class="nav nav-list">
+ <li class="nav-header">Recipes</li>
+ <li >
+ <a href="recipes/lock_manager.html" title="Distributed lock manager">Distributed lock manager</a>
+ </li>
+ <li >
+ <a href="recipes/rabbitmq_consumer_group.html" title="Rabbit MQ consumer group">Rabbit MQ consumer group</a>
+ </li>
+ <li >
+ <a href="recipes/rsync_replicated_file_store.html" title="Rsync replicated file store">Rsync replicated file store</a>
+ </li>
+ <li >
+ <a href="recipes/service_discovery.html" title="Service discovery">Service discovery</a>
+ </li>
+ <li >
+ <a href="recipes/task_dag_execution.html" title="Distributed task DAG execution">Distributed task DAG execution</a>
+ </li>
+ </ul>
+ </div>
+ </div>
+ </div>
+ </footer>
+
+ <div class="container subfooter">
+ <div class="row">
+ <div class="span12">
+ <p class="pull-right"><a href="#">Back to top</a></p>
+ <p class="copyright">Copyright ©2022 <a href="https://www.apache.org/">The Apache Software Foundation</a>. All Rights Reserved.</p>
+ <p><a href="https://github.com/olamy/reflow-maven-skin" title="Reflow Maven skin">Reflow Maven skin</a> maintained by <a href="https://twitter.com/olamy" target="_blank" title="Olivier Lamy">Olivier Lamy</a>.</p>
+ <div class="row span16"><div>Apache Helix, Apache, the Apache feather logo, and the Apache Helix project logos are trademarks of The Apache Software Foundation.
+ All other marks mentioned may be trademarks or registered trademarks of their respective owners.</div>
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+ <li>Features</li>
+ <li class="publishDate version-date pull-right">Last Published: 2022-05-11</li>
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+<section>
+ <div class="page-header">
+ <h2 id="Features">Features</h2>
+ </div>
+ <section>
+ <h3 id="CONFIGURING_IDEALSTATE">CONFIGURING IDEALSTATE</h3>
+ <p>Read concepts page for definition of Idealstate.</p>
+ <p>The placement of partitions in a DDS is very critical for reliability and scalability of the system. For example, when a node fails, it is important that the partitions hosted on that node are reallocated evenly among the remaining nodes. Consistent hashing is one such algorithm that can guarantee this. Helix by default comes with a variant of consistent hashing based of the RUSH algorithm.</p>
+ <p>This means given a number of partitions, replicas and number of nodes Helix does the automatic assignment of partition to nodes such that</p>
+ <ul>
+ <li>Each node has the same number of partitions and replicas of the same partition do not stay on the same node.</li>
+ <li>When a node fails, the partitions will be equally distributed among the remaining nodes</li>
+ <li>When new nodes are added, the number of partitions moved will be minimized along with satisfying the above two criteria.</li>
+ </ul>
+ <p>Helix provides multiple ways to control the placement and state of a replica.</p>
+ <div class="source">
+ <pre><code>
+ |AUTO REBALANCE| AUTO | CUSTOM |
+ -----------------------------------------
+ LOCATION | HELIX | APP | APP |
+ -----------------------------------------
+ STATE | HELIX | HELIX | APP |
+ -----------------------------------------
+</code></pre>
+ </div>
+ <section>
+ <h4 id="HELIX_EXECUTION_MODE">HELIX EXECUTION MODE</h4>
+ <p>Idealstate is defined as the state of the DDS when all nodes are up and running and healthy. Helix uses this as the target state of the system and computes the appropriate transitions needed in the system to bring it to a stable state.</p>
+ <p>Helix supports 3 different execution modes which allows application to explicitly control the placement and state of the replica.</p>
+ <section>
+ <h5 id="AUTO_REBALANCE">AUTO_REBALANCE</h5>
+ <p>When the idealstate mode is set to AUTO_REBALANCE, Helix controls both the location of the replica along with the state. This option is useful for applications where creation of a replica is not expensive. Example</p>
+ <div class="source">
+ <pre><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO_REBALANCE",
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ }
+ "listFields" : {
+ "MyResource_0" : [],
+ "MyResource_1" : [],
+ "MyResource_2" : []
+ },
+ "mapFields" : {
+ }
+}
+</code></pre>
+ </div>
+ <p>If there are 3 nodes in the cluster, then Helix will internally compute the ideal state as</p>
+ <div class="source">
+ <pre><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ },
+ "mapFields" : {
+ "MyResource_0" : {
+ "N1" : "LEADER",
+ "N2" : "STANDBY",
+ },
+ "MyResource_1" : {
+ "N2" : "LEADER",
+ "N3" : "STANDBY",
+ },
+ "MyResource_2" : {
+ "N3" : "LEADER",
+ "N1" : "STANDBY",
+ }
+ }
+}
+</code></pre>
+ </div>
+ <p>Another typical example is evenly distributing a group of tasks among the currently alive processes. For example, if there are 60 tasks and 4 nodes, Helix assigns 15 tasks to each node. When one node fails Helix redistributes its 15 tasks to the remaining 3 nodes. Similarly, if a node is added, Helix re-allocates 3 tasks from each of the 4 nodes to the 5th node.</p>
+ </section>
+ </section>
+ <section>
+ <h4 id="AUTO">AUTO</h4>
+ <p>When the idealstate mode is set to AUTO, Helix only controls STATE of the replicas where as the location of the partition is controlled by application. Example: The below idealstate indicates thats âMyResource_0â must be only on node1 and node2. But gives the control of assigning the STATE to Helix.</p>
+ <div class="source">
+ <pre><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO",
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ }
+ "listFields" : {
+ "MyResource_0" : [node1, node2],
+ "MyResource_1" : [node2, node3],
+ "MyResource_2" : [node3, node1]
+ },
+ "mapFields" : {
+ }
+}
+</code></pre>
+ </div>
+ <p>In this mode when node1 fails, unlike in AUTO-REBALANCE mode the partition is not moved from node1 to others nodes in the cluster. Instead, Helix will decide to change the state of MyResource_0 in N2 based on the system constraints. For example, if a system constraint specified that there should be 1 Master and if the Master failed, then node2 will be made the new leader.</p>
+ </section>
+ <section>
+ <h4 id="CUSTOM">CUSTOM</h4>
+ <p>Helix offers a third mode called CUSTOM, in which application can completely control the placement and state of each replica. Applications will have to implement an interface that Helix will invoke when the cluster state changes. Within this callback, the application can recompute the idealstate. Helix will then issue appropriate transitions such that Idealstate and Currentstate converges.</p>
+ <div class="source">
+ <pre><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "CUSTOM",
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "LeaderStandby",
+ },
+ "mapFields" : {
+ "MyResource_0" : {
+ "N1" : "LEADER",
+ "N2" : "STANDBY",
+ },
+ "MyResource_1" : {
+ "N2" : "LEADER",
+ "N3" : "STANDBY",
+ },
+ "MyResource_2" : {
+ "N3" : "LEADER",
+ "N1" : "STANDBY",
+ }
+ }
+}
+</code></pre>
+ </div>
+ <p>For example, the current state of the system might be âMyResource_0â -> {N1:LEADER,N2:STANDBY} and the application changes the ideal state to âMyResource_0â -> {N1:STANDBY,N2:LEADER}. Helix will not blindly issue LEADERâ>STANDBY to N1 and STANDBYâ>LEADER to N2 in parallel since it might result in a transient state where both N1 and N2 are leaders. Helix will first issue LEADERâ>STANDBY to N1 and after its completed it will issue STANDBYâ>LEADER to N2.</p>
+ </section>
+ </section>
+ <section>
+ <h3 id="State_Machine_Configuration">State Machine Configuration</h3>
+ <p>Helix comes with 3 default state models that are most commonly used. Its possible to have multiple state models in a cluster. Every resource that is added should have a reference to the state model.</p>
+ <ul>
+ <li>MASTER-SLAVE: Has 3 states OFFLINE,SLAVE,MASTER. Max masters is 1. Slaves will be based on the replication factor. Replication factor can be specified while adding the resource</li>
+ <li>ONLINE-OFFLINE: Has 2 states OFFLINE and ONLINE. Very simple state model and most applications start off with this state model.</li>
+ <li>LEADER-STANDBY:1 Leader and many stand bys. In general the standby's are idle.</li>
+ </ul>
+ <p>Apart from providing the state machine configuration, one can specify the constraints of states and transitions.</p>
+ <p>For example one can say Master:1. Max number of replicas in Master state at any time is 1. OFFLINE-STANDBY:5 Max number of Offline-Slave transitions that can happen concurrently in the system</p>
+ <p>STATE PRIORITY Helix uses greedy approach to satisfy the state constraints. For example if the state machine configuration says it needs 1 leader and 2 standbys but only 1 node is active, Helix must promote it to leader. This behavior is achieved by providing the state priority list as LEADER,STANDBY.</p>
+ <p>STATE TRANSITION PRIORITY Helix tries to fire as many transitions as possible in parallel to reach the stable state without violating constraints. By default Helix simply sorts the transitions alphabetically and fires as many as it can without violating the constraints. One can control this by overriding the priority order.</p>
+ </section>
+ <section>
+ <h3 id="Config_management">Config management</h3>
+ <p>Helix allows applications to store application specific properties. The configuration can have different scopes.</p>
+ <ul>
+ <li>Cluster</li>
+ <li>Node specific</li>
+ <li>Resource specific</li>
+ <li>Partition specific</li>
+ </ul>
+ <p>Helix also provides notifications when any configs are changed. This allows applications to support dynamic configuration changes.</p>
+ <p>See HelixManager.getConfigAccessor for more info</p>
+ </section>
+ <section>
+ <h3 id="Intra_cluster_messaging_api">Intra cluster messaging api</h3>
+ <p>This is an interesting feature which is quite useful in practice. Often times, nodes in DDS requires a mechanism to interact with each other. One such requirement is a process of bootstrapping a replica.</p>
+ <p>Consider a search system use case where the index replica starts up and it does not have an index. One of the commonly used solutions is to get the index from a common location or to copy the index from another replica. Helix provides a messaging api, that can be used to talk to other nodes in the system. The value added that Helix provides here is, message recipient can be specified in terms of resource, partition, state and Helix ensures that the message is delivered to all of the required recipients. In this particular use case, the instance can specify the recipient criteria as all replicas of P1. Since Helix is aware of the global state of the system, it can send the message to appropriate nodes. Once the nodes respond Helix provides the bootstrapping replica with all the responses.</p>
+ <p>This is a very generic api and can also be used to schedule various periodic tasks in the cluster like data backups etc. System Admins can also perform adhoc tasks like on demand backup or execute a system command(like rm -rf ;-)) across all nodes.</p>
+ <div class="source">
+ <pre><code> ClusterMessagingService messagingService = manager.getMessagingService();
+ //CONSTRUCT THE MESSAGE
+ Message requestBackupUriRequest = new Message(
+ MessageType.USER_DEFINE_MSG, UUID.randomUUID().toString());
+ requestBackupUriRequest
+ .setMsgSubType(BootstrapProcess.REQUEST_BOOTSTRAP_URL);
+ requestBackupUriRequest.setMsgState(MessageState.NEW);
+ //SET THE RECIPIENT CRITERIA, All nodes that satisfy the criteria will receive the message
+ Criteria recipientCriteria = new Criteria();
+ recipientCriteria.setInstanceName("%");
+ recipientCriteria.setRecipientInstanceType(InstanceType.PARTICIPANT);
+ recipientCriteria.setResource("MyDB");
+ recipientCriteria.setPartition("");
+ //Should be processed only the process that is active at the time of sending the message.
+ //This means if the recipient is restarted after message is sent, it will not be processed.
+ recipientCriteria.setSessionSpecific(true);
+ // wait for 30 seconds
+ int timeout = 30000;
+ //The handler that will be invoked when any recipient responds to the message.
+ BootstrapReplyHandler responseHandler = new BootstrapReplyHandler();
+ //This will return only after all recipients respond or after timeout.
+ int sentMessageCount = messagingService.sendAndWait(recipientCriteria,
+ requestBackupUriRequest, responseHandler, timeout);
+</code></pre>
+ </div>
+ <p>See HelixManager.getMessagingService for more info.</p>
+ </section>
+ <section>
+ <h3 id="Application_specific_property_storage">Application specific property storage</h3>
+ <p>There are several usecases where applications needs support for distributed data structures. Helix uses Zookeeper to store the application data and hence provides notifications when the data changes. One value add Helix provides is the ability to specify cache the data and also write through cache. This is more efficient than reading from ZK every time.</p>
+ <p>See HelixManager.getHelixPropertyStore</p>
+ </section>
+ <section>
+ <h3 id="Throttling">Throttling</h3>
+ <p>Since all state changes in the system are triggered through transitions, Helix can control the number of transitions that can happen in parallel. Some of the transitions may be light weight but some might involve moving data around which is quite expensive. Helix allows applications to set threshold on transitions. The threshold can be set at the multiple scopes.</p>
+ <ul>
+ <li>MessageType e.g STATE_TRANSITION</li>
+ <li>TransitionType e.g STANDBY-LEADER</li>
+ <li>Resource e.g database</li>
+ <li>Node i.e per node max transitions in parallel.</li>
+ </ul>
+ <p>See HelixManager.getHelixAdmin.addMessageConstraint()</p>
+ </section>
+ <section>
+ <h3 id="Health_monitoring_and_alerting">Health monitoring and alerting</h3>
+ <p>This in currently in development mode, not yet productionized.</p>
+ <p>Helix provides ability for each node in the system to report health metrics on a periodic basis. Helix supports multiple ways to aggregate these metrics like simple SUM, AVG, EXPONENTIAL DECAY, WINDOW. Helix will only persist the aggregated value. Applications can define threshold on the aggregate values according to the SLA's and when the SLA is violated Helix will fire an alert. Currently Helix only fires an alert but eventually we plan to use this metrics to either mark the node dead or load balance the partitions. This feature will be valuable in for distributed systems that support multi-tenancy and have huge variation in work load patterns. Another place this can be used is to detect skewed partitions and rebalance the cluster.</p>
+ <p>This feature is not yet stable and do not recommend to be used in production.</p>
+ </section>
+ <section>
+ <h3 id="Controller_deployment_modes">Controller deployment modes</h3>
+ <p>Read Architecture wiki for more details on the Role of a controller. In simple words, it basically controls the participants in the cluster by issuing transitions.</p>
+ <p>Helix provides multiple options to deploy the controller.</p>
+ <section>
+ <h4 id="STANDALONE">STANDALONE</h4>
+ <p>Controller can be started as a separate process to manage a cluster. This is the recommended approach. How ever since one controller can be a single point of failure, multiple controller processes are required for reliability. Even if multiple controllers are running only one will be actively managing the cluster at any time and is decided by a leader election process. If the leader fails, another leader will resume managing the cluster.</p>
+ <p>Even though we recommend this method of deployment, it has the drawback of having to manage an additional service for each cluster. See Controller As a Service option.</p>
+ </section>
+ <section>
+ <h4 id="EMBEDDED">EMBEDDED</h4>
+ <p>If setting up a separate controller process is not viable, then it is possible to embed the controller as a library in each of the participant.</p>
+ </section>
+ <section>
+ <h4 id="CONTROLLER_AS_A_SERVICE">CONTROLLER AS A SERVICE</h4>
+ <p>One of the cool feature we added in helix was use a set of controllers to manage a large number of clusters. For example if you have X clusters to be managed, instead of deploying X*3(3 controllers for fault tolerance) controllers for each cluster, one can deploy only 3 controllers. Each controller can manage X/3 clusters. If any controller fails the remaining two will manage X/2 clusters. At LinkedIn, we always deploy controllers in this mode.</p>
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URL: http://svn.apache.org/viewvc/helix/site-content/1.0.5-docs/JobExample.json?rev=1900823&view=auto
==============================================================================
--- helix/site-content/1.0.5-docs/JobExample.json (added)
+++ helix/site-content/1.0.5-docs/JobExample.json Thu May 12 05:29:03 2022
@@ -0,0 +1,19 @@
+{
+ "id" : "TestJob",
+ "simpleFields": {
+ "JobID":"Job2",
+ "WorkflowID":"Workflow1"
+ },
+ "mapFields":{
+ "Task1" : {
+ "TASK_ID":"Task1",
+ "TASK_COMMAND":"Backup",
+ "TASK_TARGET_PARTITION":"p1"
+ },
+ "Task2" : {
+ "TASK_ID":"Task2",
+ "TASK_COMMAND":"ReIndex",
+ }
+ },
+ "listFields":{}
+}