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| <h2 title="Class CachedClusterId" class="title">Class CachedClusterId</h2> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/master/CachedClusterId.html#line.46">CachedClusterId</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></pre> |
| <div class="block">Caches the cluster ID of the cluster. For standby masters, this is used to serve the client |
| RPCs that fetch the cluster ID. ClusterID is only created by an active master if one does not |
| already exist. Standby masters just read the information from the file system. This class is |
| thread-safe. |
| |
| TODO: Make it a singleton without affecting concurrent junit tests.</div> |
| </li> |
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| <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/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#cacheMisses">cacheMisses</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/ClusterId.html" title="class in org.apache.hadoop.hbase">ClusterId</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#clusterId">clusterId</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) <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/master/CachedClusterId.html#fetchInProgress">fetchInProgress</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.FileSystem</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#fs">fs</a></span></code> </td> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>private <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/master/CachedClusterId.html#isClusterIdSet">isClusterIdSet</a></span></code> </td> |
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| <td class="colFirst"><code>static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#MAX_FETCH_TIMEOUT_MS">MAX_FETCH_TIMEOUT_MS</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.Path</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#rootDir">rootDir</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/Server.html" title="interface in org.apache.hadoop.hbase">Server</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#server">server</a></span></code> </td> |
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| org.apache.hadoop.conf.Configuration conf)</code> </td> |
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| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#attemptFetch--">attemptFetch</a></span>()</code> |
| <div class="block">Attempts to fetch the cluster ID from the file system.</div> |
| </td> |
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| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#getCacheStats--">getCacheStats</a></span>()</code> </td> |
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| <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/master/CachedClusterId.html#getClusterId--">getClusterId</a></span>()</code> |
| <div class="block">Returns a cached copy of the cluster ID.</div> |
| </td> |
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| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><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/master/CachedClusterId.html#getFromCacheOrFetch--">getFromCacheOrFetch</a></span>()</code> |
| <div class="block">Fetches the ClusterId from FS if it is not cached locally.</div> |
| </td> |
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| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#setClusterId-org.apache.hadoop.hbase.ClusterId-">setClusterId</a></span>(<a href="../../../../../org/apache/hadoop/hbase/ClusterId.html" title="class in org.apache.hadoop.hbase">ClusterId</a> id)</code> |
| <div class="block">Succeeds only once, when setting to a non-null value.</div> |
| </td> |
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| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/CachedClusterId.html#waitForFetchToFinish--">waitForFetchToFinish</a></span>()</code> </td> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/master/CachedClusterId.html#line.68">CachedClusterId</a>(<a href="../../../../../org/apache/hadoop/hbase/Server.html" title="interface in org.apache.hadoop.hbase">Server</a> server, |
| org.apache.hadoop.conf.Configuration conf) |
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| <div class="block">Succeeds only once, when setting to a non-null value. Overwrites are not allowed.</div> |
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| <div class="block">Returns a cached copy of the cluster ID. null if the cache is not populated.</div> |
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| <pre>private boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/master/CachedClusterId.html#line.102">attemptFetch</a>()</pre> |
| <div class="block">Attempts to fetch the cluster ID from the file system. If no attempt is already in progress, |
| synchronously fetches the cluster ID and sets it. If an attempt is already in progress, |
| returns right away and the caller is expected to wait for the fetch to finish.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the attempt is done, false if another thread is already fetching it.</dd> |
| </dl> |
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| <pre>private void <a href="../../../../../src-html/org/apache/hadoop/hbase/master/CachedClusterId.html#line.122">waitForFetchToFinish</a>() |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
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| <div class="block">Fetches the ClusterId from FS if it is not cached locally. Atomically updates the cached |
| copy and is thread-safe. Optimized to do a single fetch when there are multiple threads are |
| trying get from a clean cache.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>ClusterId by reading from FileSystem or null in any error case or cluster ID does |
| not exist on the file system or if the server initiated a tear down.</dd> |
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