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| <div class="subTitle">org.apache.hadoop.hbase.chaos</div> |
| <h2 title="Class ChaosAgent" class="title">Class ChaosAgent</h2> |
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| <ul class="inheritance"> |
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| <ul class="inheritance"> |
| <li>org.apache.hadoop.hbase.chaos.ChaosAgent</li> |
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| <div class="description"> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a>, org.apache.zookeeper.Watcher</dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.74">ChaosAgent</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements org.apache.zookeeper.Watcher, <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Runnable.html?is-external=true" title="class or interface in java.lang">Runnable</a></pre> |
| <div class="block">An agent for executing destructive actions for ChaosMonkey. |
| Uses ZooKeeper Watchers and LocalShell, to do the killing |
| and getting status of service on targeted host without SSH. |
| uses given ZNode Structure: |
| /perfChaosTest (root) |
| | |
| | |
| /chaosAgents (Used for registration has |
| hostname ephemeral nodes as children) |
| | |
| | |
| /chaosAgentTaskStatus (Used for task |
| Execution, has hostname persistent |
| nodes as child with tasks as their children) |
| | |
| | |
| /hostname |
| | |
| | |
| /task0000001 (command as data) |
| (has two types of command : |
| 1: starts with "exec" |
| for executing a destructive action. |
| 2: starts with "bool" for getting |
| only status of service.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>protected static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.LocalShell.html" title="class in org.apache.hadoop.hbase.chaos">ChaosAgent.LocalShell</a></span></code> |
| <div class="block">Executes Command locally.</div> |
| </td> |
| </tr> |
| </table> |
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| </a> |
| <h3>Nested classes/interfaces inherited from interface org.apache.zookeeper.Watcher</h3> |
| <code>org.apache.zookeeper.Watcher.Event, org.apache.zookeeper.Watcher.WatcherType</code></li> |
| </ul> |
| </li> |
| </ul> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <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/hadoop/hbase/chaos/ChaosAgent.html#agentName">agentName</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.conf.Configuration</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#conf">conf</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#connected">connected</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) org.apache.zookeeper.AsyncCallback.StringCallback</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#createEphemeralZNodeCallback">createEphemeralZNodeCallback</a></span></code> |
| <div class="block">Callback used while creating a Ephemeral ZNode tries to create ZNode again |
| if Connection was lost in previous try.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) org.apache.zookeeper.AsyncCallback.StringCallback</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#createZNodeCallback">createZNodeCallback</a></span></code> |
| <div class="block">Callback used while creating a Persistent ZNode tries to create |
| ZNode again if Connection was lost in previous try.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) org.apache.zookeeper.AsyncCallback.DataCallback</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#getTaskForExecutionCallback">getTaskForExecutionCallback</a></span></code> |
| <div class="block">Callback used by getTasksForAgentCallback while getting command, |
| after getting command successfully, it executes command and |
| set its status with respect to the command type.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) org.apache.zookeeper.AsyncCallback.ChildrenCallback</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#getTasksForAgentCallback">getTasksForAgentCallback</a></span></code> |
| <div class="block">Callback used while getting Tasks for agent if call executed without Exception, |
| It creates a separate thread for each children to execute given Tasks parallely.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) org.apache.zookeeper.Watcher</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#newTaskCreatedWatcher">newTaskCreatedWatcher</a></span></code> |
| <div class="block">Watcher for notifying if any task is assigned to agent or not, |
| by seeking if any Node is being added to agent as Child.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <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/hadoop/hbase/chaos/ChaosAgent.html#quorum">quorum</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/RetryCounterFactory.html" title="class in org.apache.hadoop.hbase.util">RetryCounterFactory</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#retryCounterFactory">retryCounterFactory</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) org.apache.zookeeper.AsyncCallback.StatCallback</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#setStatusOfTaskZNodeCallback">setStatusOfTaskZNodeCallback</a></span></code> |
| <div class="block">Callback used while setting status of a given task, Logs given status.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicBoolean</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#stopChaosAgent">stopChaosAgent</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.zookeeper.ZooKeeper</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#zk">zk</a></span></code> </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="constructor.summary"> |
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| <h3>Constructor Summary</h3> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#ChaosAgent-org.apache.hadoop.conf.Configuration-java.lang.String-java.lang.String-">ChaosAgent</a></span>(org.apache.hadoop.conf.Configuration conf, |
| <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> quorum, |
| <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> agentName)</code> </td> |
| </tr> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <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/hadoop/hbase/chaos/ChaosAgent.html#close--">close</a></span>()</code> </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/hadoop/hbase/chaos/ChaosAgent.html#createEphemeralZNode-java.lang.String-byte:A-">createEphemeralZNode</a></span>(<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> path, |
| byte[] data)</code> |
| <div class="block">Function to create EPHEMERAL ZNODE with given path and data as params.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#createIfZNodeNotExists-java.lang.String-">createIfZNodeNotExists</a></span>(<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> path)</code> |
| <div class="block">Checks if given ZNode exists, if not creates a PERSISTENT ZNODE for same.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#createZKConnection-org.apache.zookeeper.Watcher-">createZKConnection</a></span>(org.apache.zookeeper.Watcher watcher)</code> |
| <div class="block">Creates Connection with ZooKeeper.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#createZNode-java.lang.String-byte:A-">createZNode</a></span>(<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> path, |
| byte[] data)</code> |
| <div class="block">Function to create PERSISTENT ZNODE with given path and data given as params</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<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/hadoop/hbase/chaos/ChaosAgent.html#exec-java.lang.String-java.lang.String-">exec</a></span>(<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> user, |
| <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> cmd)</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<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/hadoop/hbase/chaos/ChaosAgent.html#execWithRetries-java.lang.String-java.lang.String-">execWithRetries</a></span>(<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> user, |
| <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> cmd)</code> |
| <div class="block">Below function executes command with retries with given user.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#getTasks--">getTasks</a></span>()</code> |
| <div class="block">Gets tasks for execution, basically sets Watch on it's respective host's Znode and |
| waits for tasks to be assigned, also has a getTasksForAgentCallback |
| which handles execution of task.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#initChaosAgent-org.apache.hadoop.conf.Configuration-java.lang.String-java.lang.String-">initChaosAgent</a></span>(org.apache.hadoop.conf.Configuration conf, |
| <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> quorum, |
| <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> agentName)</code> |
| <div class="block">sets global params and initiates connection with ZooKeeper then does registration.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#isConnected--">isConnected</a></span>()</code> </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#process-org.apache.zookeeper.WatchedEvent-">process</a></span>(org.apache.zookeeper.WatchedEvent watchedEvent)</code> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#recreateZKConnection--">recreateZKConnection</a></span>()</code> </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#register--">register</a></span>()</code> |
| <div class="block">registration of ChaosAgent by checking and creating necessary ZNodes.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>private <E extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a>><br>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#retryOrThrow-org.apache.hadoop.hbase.util.RetryCounter-E-java.lang.String-java.lang.String-">retryOrThrow</a></span>(<a href="../../../../../org/apache/hadoop/hbase/util/RetryCounter.html" title="class in org.apache.hadoop.hbase.util">RetryCounter</a> retryCounter, |
| E ex, |
| <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> user, |
| <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> cmd)</code> </td> |
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| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#run--">run</a></span>()</code> </td> |
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| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/chaos/ChaosAgent.html#setStatusOfTaskZNode-java.lang.String-java.lang.String-">setStatusOfTaskZNode</a></span>(<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> taskZNode, |
| <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> status)</code> |
| <div class="block">sets given Status for Task Znode</div> |
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| <pre>org.apache.zookeeper.Watcher <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.131">newTaskCreatedWatcher</a></pre> |
| <div class="block">Watcher for notifying if any task is assigned to agent or not, |
| by seeking if any Node is being added to agent as Child.</div> |
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| <div class="block">Callback used while setting status of a given task, Logs given status.</div> |
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| <div class="block">Callback used while creating a Persistent ZNode tries to create |
| ZNode again if Connection was lost in previous try.</div> |
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| <div class="block">Callback used while creating a Ephemeral ZNode tries to create ZNode again |
| if Connection was lost in previous try.</div> |
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| <div class="block">Callback used by getTasksForAgentCallback while getting command, |
| after getting command successfully, it executes command and |
| set its status with respect to the command type.</div> |
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| <pre>org.apache.zookeeper.AsyncCallback.ChildrenCallback <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.298">getTasksForAgentCallback</a></pre> |
| <div class="block">Callback used while getting Tasks for agent if call executed without Exception, |
| It creates a separate thread for each children to execute given Tasks parallely.</div> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.85">ChaosAgent</a>(org.apache.hadoop.conf.Configuration conf, |
| <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> quorum, |
| <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> agentName)</pre> |
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| <pre>private void <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.95">initChaosAgent</a>(org.apache.hadoop.conf.Configuration conf, |
| <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> quorum, |
| <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> agentName)</pre> |
| <div class="block">sets global params and initiates connection with ZooKeeper then does registration.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - initial configuration to use</dd> |
| <dd><code>quorum</code> - ZK Quorum</dd> |
| <dd><code>agentName</code> - AgentName to use</dd> |
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| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Creates Connection with ZooKeeper.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if something goes wrong</dd> |
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| byte[] data)</pre> |
| <div class="block">Function to create PERSISTENT ZNODE with given path and data given as params</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - Path at which ZNode to create</dd> |
| <dd><code>data</code> - Data to put under ZNode</dd> |
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| byte[] data)</pre> |
| <div class="block">Function to create EPHEMERAL ZNODE with given path and data as params.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - Path at which Ephemeral ZNode to create</dd> |
| <dd><code>data</code> - Data to put under ZNode</dd> |
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| <div class="block">Checks if given ZNode exists, if not creates a PERSISTENT ZNODE for same.</div> |
| <dl> |
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| <dd><code>path</code> - Path to check for ZNode</dd> |
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| <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> status)</pre> |
| <div class="block">sets given Status for Task Znode</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>taskZNode</code> - ZNode to set status</dd> |
| <dd><code>status</code> - Status value</dd> |
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| <div class="block">registration of ChaosAgent by checking and creating necessary ZNodes.</div> |
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| <div class="block">Gets tasks for execution, basically sets Watch on it's respective host's Znode and |
| waits for tasks to be assigned, also has a getTasksForAgentCallback |
| which handles execution of task.</div> |
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| <pre>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<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>> <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.451">execWithRetries</a>(<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> user, |
| <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> cmd) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Below function executes command with retries with given user. |
| Uses LocalShell to execute a command.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>user</code> - user name, default none</dd> |
| <dd><code>cmd</code> - Command to execute</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A pair of Exit Code and Shell output</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - Exception while executing shell command</dd> |
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| <pre>private <a href="../../../../../org/apache/hadoop/hbase/util/Pair.html" title="class in org.apache.hadoop.hbase.util">Pair</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>,<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>> <a href="../../../../../src-html/org/apache/hadoop/hbase/chaos/ChaosAgent.html#line.467">exec</a>(<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> user, |
| <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> cmd) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
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| E ex, |
| <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> user, |
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