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| <h1 title="Package" class="title">Package org.apache.drill.yarn.zk</h1> |
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| <div class="block">Interface between the Application Master and ZooKeeper.</div> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/yarn/zk/AMRegistry.html" title="class in org.apache.drill.yarn.zk">AMRegistry</a></td> |
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| <div class="block">Register this App Master in ZK to prevent duplicates.</div> |
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| <div class="block">Manages cluster coordination utilizing zookeeper.</div> |
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| <div class="block">Driver class for the ZooKeeper cluster coordinator.</div> |
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| <td class="colFirst"><a href="../../../../../org/apache/drill/yarn/zk/ZKRegistry.DrillbitTracker.html" title="class in org.apache.drill.yarn.zk">ZKRegistry.DrillbitTracker</a></td> |
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| <div class="block">State of each Drillbit that we've discovered through ZK or launched via the |
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| <div class="block">A Drillbit can be in one of four states.</div> |
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| <h2 title="Package org.apache.drill.yarn.zk Description">Package org.apache.drill.yarn.zk Description</h2> |
| <div class="block">Interface between the Application Master and ZooKeeper. Classes here manage two |
| registrations: Drillbits and the AM itself. |
| <p> |
| Drillbit registration is used to confirm that Drillbits have indeed come online. |
| If Drillbits fail to come online, then the AM concludes that somethign went wrong. |
| If Drilbits drop offline unexpectedly, the AM concludes that the Drillbit is sick |
| and restarts it. |
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| The AM registry prevents two AMs from attempting to manage the same cluster.</div> |
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