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| <h2 title="Class MetaRegionLocationCache" class="title">Class MetaRegionLocationCache</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.48">MetaRegionLocationCache</a> |
| extends <a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></pre> |
| <div class="block">A cache of meta region location metadata. Registers a listener on ZK to track changes to the |
| meta table znodes. Clients are expected to retry if the meta information is stale. This class |
| is thread-safe (a single instance of this class can be shared by multiple threads without race |
| conditions).</div> |
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| <td class="colFirst"><code>private static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.ZNodeOpType.html" title="enum in org.apache.hadoop.hbase.master">MetaRegionLocationCache.ZNodeOpType</a></span></code> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/types/CopyOnWriteArrayMap.html" title="class in org.apache.hadoop.hbase.types">CopyOnWriteArrayMap</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="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#cachedMetaLocations">cachedMetaLocations</a></span></code> |
| <div class="block">Cached meta region locations indexed by replica ID.</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/master/MetaRegionLocationCache.html#LOG">LOG</a></span></code> </td> |
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| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#MAX_ZK_META_FETCH_RETRIES">MAX_ZK_META_FETCH_RETRIES</a></span></code> |
| <div class="block">Maximum number of times we retry when ZK operation times out.</div> |
| </td> |
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| <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/master/MetaRegionLocationCache.html#retryCounterFactory">retryCounterFactory</a></span></code> </td> |
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| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#SLEEP_INTERVAL_MS_BETWEEN_RETRIES">SLEEP_INTERVAL_MS_BETWEEN_RETRIES</a></span></code> |
| <div class="block">Sleep interval ms between ZK operation retries.</div> |
| </td> |
| </tr> |
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| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#SLEEP_INTERVAL_MS_MAX">SLEEP_INTERVAL_MS_MAX</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#MetaRegionLocationCache-org.apache.hadoop.hbase.zookeeper.ZKWatcher-">MetaRegionLocationCache</a></span>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a> zkWatcher)</code> </td> |
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| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#getMetaRegionLocation-int-">getMetaRegionLocation</a></span>(int replicaId)</code> |
| <div class="block">Gets the HRegionLocation for a given meta replica ID.</div> |
| </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#getMetaRegionLocations--">getMetaRegionLocations</a></span>()</code> </td> |
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| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#isValidMetaPath-java.lang.String-">isValidMetaPath</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">Helper to check if the given 'path' corresponds to a meta znode.</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/master/MetaRegionLocationCache.html#loadMetaLocationsFromZk-org.apache.hadoop.hbase.util.RetryCounter-org.apache.hadoop.hbase.master.MetaRegionLocationCache.ZNodeOpType-">loadMetaLocationsFromZk</a></span>(<a href="../../../../../org/apache/hadoop/hbase/util/RetryCounter.html" title="class in org.apache.hadoop.hbase.util">RetryCounter</a> retryCounter, |
| <a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.ZNodeOpType.html" title="enum in org.apache.hadoop.hbase.master">MetaRegionLocationCache.ZNodeOpType</a> opType)</code> |
| <div class="block">Populates the current snapshot of meta locations from ZK.</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/master/MetaRegionLocationCache.html#nodeChildrenChanged-java.lang.String-">nodeChildrenChanged</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">Called when an existing node has a child node added or removed.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#nodeCreated-java.lang.String-">nodeCreated</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">Called when a new node has been created.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#nodeDataChanged-java.lang.String-">nodeDataChanged</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">Called when an existing node has changed data.</div> |
| </td> |
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| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#nodeDeleted-java.lang.String-">nodeDeleted</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">Called when a node has been deleted</div> |
| </td> |
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| <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/master/MetaRegionLocationCache.html#updateMetaLocation-java.lang.String-org.apache.hadoop.hbase.master.MetaRegionLocationCache.ZNodeOpType-">updateMetaLocation</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, |
| <a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.ZNodeOpType.html" title="enum in org.apache.hadoop.hbase.master">MetaRegionLocationCache.ZNodeOpType</a> opType)</code> </td> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.50">LOG</a></pre> |
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| <h4>retryCounterFactory</h4> |
| <pre>private final <a href="../../../../../org/apache/hadoop/hbase/util/RetryCounterFactory.html" title="class in org.apache.hadoop.hbase.util">RetryCounterFactory</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.61">retryCounterFactory</a></pre> |
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| <h4>cachedMetaLocations</h4> |
| <pre>private final <a href="../../../../../org/apache/hadoop/hbase/types/CopyOnWriteArrayMap.html" title="class in org.apache.hadoop.hbase.types">CopyOnWriteArrayMap</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="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.71">cachedMetaLocations</a></pre> |
| <div class="block">Cached meta region locations indexed by replica ID. |
| CopyOnWriteArrayMap ensures synchronization during updates and a consistent snapshot during |
| client requests. Even though CopyOnWriteArrayMap copies the data structure for every write, |
| that should be OK since the size of the list is often small and mutations are not too often |
| and we do not need to block client requests while mutations are in progress.</div> |
| </li> |
| </ul> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <ul class="blockList"> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="MetaRegionLocationCache-org.apache.hadoop.hbase.zookeeper.ZKWatcher-"> |
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| <h4>MetaRegionLocationCache</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.80">MetaRegionLocationCache</a>(<a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKWatcher.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKWatcher</a> zkWatcher)</pre> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="loadMetaLocationsFromZk-org.apache.hadoop.hbase.util.RetryCounter-org.apache.hadoop.hbase.master.MetaRegionLocationCache.ZNodeOpType-"> |
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| <h4>loadMetaLocationsFromZk</h4> |
| <pre>private void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.101">loadMetaLocationsFromZk</a>(<a href="../../../../../org/apache/hadoop/hbase/util/RetryCounter.html" title="class in org.apache.hadoop.hbase.util">RetryCounter</a> retryCounter, |
| <a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.ZNodeOpType.html" title="enum in org.apache.hadoop.hbase.master">MetaRegionLocationCache.ZNodeOpType</a> opType)</pre> |
| <div class="block">Populates the current snapshot of meta locations from ZK. If no meta znodes exist, it registers |
| a watcher on base znode to check for any CREATE/DELETE events on the children.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>retryCounter</code> - controls the number of retries and sleep between retries.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getMetaRegionLocation-int-"> |
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| <h4>getMetaRegionLocation</h4> |
| <pre>private <a href="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.146">getMetaRegionLocation</a>(int replicaId) |
| throws org.apache.zookeeper.KeeperException</pre> |
| <div class="block">Gets the HRegionLocation for a given meta replica ID. Renews the watch on the znode for |
| future updates.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>replicaId</code> - ReplicaID of the region.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>HRegionLocation for the meta replica.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>org.apache.zookeeper.KeeperException</code> - if there is any issue fetching/parsing the serialized data.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="updateMetaLocation-java.lang.String-org.apache.hadoop.hbase.master.MetaRegionLocationCache.ZNodeOpType-"> |
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| <h4>updateMetaLocation</h4> |
| <pre>private void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.159">updateMetaLocation</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> path, |
| <a href="../../../../../org/apache/hadoop/hbase/master/MetaRegionLocationCache.ZNodeOpType.html" title="enum in org.apache.hadoop.hbase.master">MetaRegionLocationCache.ZNodeOpType</a> opType)</pre> |
| </li> |
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| <h4>getMetaRegionLocations</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html?is-external=true" title="class or interface in java.util">Optional</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../org/apache/hadoop/hbase/HRegionLocation.html" title="class in org.apache.hadoop.hbase">HRegionLocation</a>>> <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.204">getMetaRegionLocations</a>()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Optional list of HRegionLocations for meta replica(s), null if the cache is empty.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isValidMetaPath-java.lang.String-"> |
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| <h4>isValidMetaPath</h4> |
| <pre>private boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.223">isValidMetaPath</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> path)</pre> |
| <div class="block">Helper to check if the given 'path' corresponds to a meta znode. This listener is only |
| interested in changes to meta znodes.</div> |
| </li> |
| </ul> |
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| <h4>nodeCreated</h4> |
| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.228">nodeCreated</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> path)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeCreated-java.lang.String-">ZKListener</a></code></span></div> |
| <div class="block">Called when a new node has been created.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeCreated-java.lang.String-">nodeCreated</a></code> in class <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - full path of the new node</dd> |
| </dl> |
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| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.233">nodeDeleted</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> path)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDeleted-java.lang.String-">ZKListener</a></code></span></div> |
| <div class="block">Called when a node has been deleted</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDeleted-java.lang.String-">nodeDeleted</a></code> in class <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - full path of the deleted node</dd> |
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| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.238">nodeDataChanged</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> path)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDataChanged-java.lang.String-">ZKListener</a></code></span></div> |
| <div class="block">Called when an existing node has changed data.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeDataChanged-java.lang.String-">nodeDataChanged</a></code> in class <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - full path of the updated node</dd> |
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| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/MetaRegionLocationCache.html#line.243">nodeChildrenChanged</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> path)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeChildrenChanged-java.lang.String-">ZKListener</a></code></span></div> |
| <div class="block">Called when an existing node has a child node added or removed.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html#nodeChildrenChanged-java.lang.String-">nodeChildrenChanged</a></code> in class <code><a href="../../../../../org/apache/hadoop/hbase/zookeeper/ZKListener.html" title="class in org.apache.hadoop.hbase.zookeeper">ZKListener</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>path</code> - full path of the node whose children have changed</dd> |
| </dl> |
| </li> |
| </ul> |
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