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| <div class="subTitle">org.apache.hadoop.io.wrappedio</div> |
| <h2 title="Class WrappedStatistics" class="title">Class WrappedStatistics</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
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| <ul class="inheritance"> |
| <li>org.apache.hadoop.io.wrappedio.WrappedStatistics</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Unstable |
| public final class <span class="typeNameLabel">WrappedStatistics</span> |
| 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">Reflection-friendly access to IOStatistics APIs. |
| All <code>Serializable</code> arguments/return values are actually |
| <code>IOStatisticsSource</code> instances; passing in the wrong value |
| will raise IllegalArgumentExceptions.</div> |
| </li> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static 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>static <T> T</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#applyToIOStatisticsSnapshot-java.io.Serializable-org.apache.hadoop.util.functional.FunctionRaisingIOE-">applyToIOStatisticsSnapshot</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source, |
| org.apache.hadoop.util.functional.FunctionRaisingIOE<<a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics">IOStatisticsSnapshot</a>,T> fun)</code> |
| <div class="block">Apply a function to an object which may be an IOStatisticsSnapshot.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatistics_counters-java.io.Serializable-">iostatistics_counters</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</code> |
| <div class="block">Get the counters of an IOStatisticsSnapshot.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatistics_gauges-java.io.Serializable-">iostatistics_gauges</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</code> |
| <div class="block">Get the gauges of an IOStatisticsSnapshot.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatistics_maximums-java.io.Serializable-">iostatistics_maximums</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</code> |
| <div class="block">Get the maximums of an IOStatisticsSnapshot.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatistics_means-java.io.Serializable-">iostatistics_means</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</code> |
| <div class="block">Get the means of an IOStatisticsSnapshot.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatistics_minimums-java.io.Serializable-">iostatistics_minimums</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</code> |
| <div class="block">Get the minimums of an IOStatisticsSnapshot.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static <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/io/wrappedio/WrappedStatistics.html#iostatistics_toPrettyString-java.lang.Object-">iostatistics_toPrettyString</a></span>(<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> statistics)</code> |
| <div class="block">Convert IOStatistics to a string form, with all the metrics sorted |
| and empty value stripped.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsContext_aggregate-java.lang.Object-">iostatisticsContext_aggregate</a></span>(<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> source)</code> |
| <div class="block">Aggregate into the IOStatistics context the statistics passed in via |
| IOStatistics/source parameter.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsContext_enabled--">iostatisticsContext_enabled</a></span>()</code> |
| <div class="block">Static probe to check if the thread-level IO statistics enabled.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>static <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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsContext_getCurrent--">iostatisticsContext_getCurrent</a></span>()</code> |
| <div class="block">Get the context's <code>IOStatisticsContext</code> which |
| implements <code>IOStatisticsSource</code>.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsContext_reset--">iostatisticsContext_reset</a></span>()</code> |
| <div class="block">Reset the context's IOStatistics.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsContext_setThreadIOStatisticsContext-java.lang.Object-">iostatisticsContext_setThreadIOStatisticsContext</a></span>(<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> statisticsContext)</code> |
| <div class="block">Set the IOStatisticsContext for the current thread.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsContext_snapshot--">iostatisticsContext_snapshot</a></span>()</code> |
| <div class="block">Take a snapshot of the context IOStatistics.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_aggregate-java.io.Serializable-java.lang.Object-">iostatisticsSnapshot_aggregate</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> snapshot, |
| <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> statistics)</code> |
| <div class="block">Aggregate an existing <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> with |
| the supplied statistics.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_create--">iostatisticsSnapshot_create</a></span>()</code> |
| <div class="block">Create a new <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> instance.</div> |
| </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_create-java.lang.Object-">iostatisticsSnapshot_create</a></span>(<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> source)</code> |
| <div class="block">Create a new <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> instance.</div> |
| </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_fromJsonString-java.lang.String-">iostatisticsSnapshot_fromJsonString</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> json)</code> |
| <div class="block">Load IOStatisticsSnapshot from a JSON string.</div> |
| </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_load-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-">iostatisticsSnapshot_load</a></span>(<a href="../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <a href="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> path)</code> |
| <div class="block">Load IOStatisticsSnapshot from a Hadoop filesystem.</div> |
| </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_retrieve-java.lang.Object-">iostatisticsSnapshot_retrieve</a></span>(<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> source)</code> |
| <div class="block">Extract the IOStatistics from an object in a serializable form.</div> |
| </td> |
| </tr> |
| <tr id="i19" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_save-java.io.Serializable-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-boolean-">iostatisticsSnapshot_save</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> snapshot, |
| <a href="../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <a href="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> path, |
| boolean overwrite)</code> |
| <div class="block">Save IOStatisticsSnapshot to a Hadoop filesystem as a JSON file.</div> |
| </td> |
| </tr> |
| <tr id="i20" class="altColor"> |
| <td class="colFirst"><code>static <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/io/wrappedio/WrappedStatistics.html#iostatisticsSnapshot_toJsonString-java.io.Serializable-">iostatisticsSnapshot_toJsonString</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> snapshot)</code> |
| <div class="block">Save IOStatisticsSnapshot to a JSON string.</div> |
| </td> |
| </tr> |
| <tr id="i21" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#isIOStatistics-java.lang.Object-">isIOStatistics</a></span>(<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> object)</code> |
| <div class="block">Probe for an object being an instance of <code>IOStatistics</code>.</div> |
| </td> |
| </tr> |
| <tr id="i22" class="altColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#isIOStatisticsSnapshot-java.io.Serializable-">isIOStatisticsSnapshot</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> object)</code> |
| <div class="block">Probe for an object being an instance of <code>IOStatisticsSnapshot</code>.</div> |
| </td> |
| </tr> |
| <tr id="i23" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/io/wrappedio/WrappedStatistics.html#isIOStatisticsSource-java.lang.Object-">isIOStatisticsSource</a></span>(<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> object)</code> |
| <div class="block">Probe for an object being an instance of <code>IOStatisticsSource</code>.</div> |
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| <pre>public static boolean isIOStatisticsSource(<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> object)</pre> |
| <div class="block">Probe for an object being an instance of <code>IOStatisticsSource</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>object</code> - object to probe</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the object is the right type.</dd> |
| </dl> |
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| <h4>isIOStatistics</h4> |
| <pre>public static boolean isIOStatistics(<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> object)</pre> |
| <div class="block">Probe for an object being an instance of <code>IOStatistics</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>object</code> - object to probe</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the object is the right type.</dd> |
| </dl> |
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| <pre>public static boolean isIOStatisticsSnapshot(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> object)</pre> |
| <div class="block">Probe for an object being an instance of <code>IOStatisticsSnapshot</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>object</code> - object to probe</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the object is the right type.</dd> |
| </dl> |
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| <pre>public static boolean iostatisticsSnapshot_aggregate(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> snapshot, |
| <a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <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> statistics)</pre> |
| <div class="block">Aggregate an existing <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> with |
| the supplied statistics.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>snapshot</code> - snapshot to update</dd> |
| <dd><code>statistics</code> - IOStatistics to add</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the snapshot was updated.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the <code>statistics</code> argument is not |
| null but not an instance of IOStatistics, or if <code>snapshot</code> is invalid.</dd> |
| </dl> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> iostatisticsSnapshot_create()</pre> |
| <div class="block">Create a new <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> instance.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an empty IOStatisticsSnapshot.</dd> |
| </dl> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> iostatisticsSnapshot_create(<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <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> source)</pre> |
| <div class="block">Create a new <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> instance.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - optional source statistics</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an IOStatisticsSnapshot.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassCastException.html?is-external=true" title="class or interface in java.lang">ClassCastException</a></code> - if the <code>source</code> is not null and not an IOStatistics instance</dd> |
| </dl> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> iostatisticsSnapshot_load(<a href="../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <a href="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> path)</pre> |
| <div class="block">Load IOStatisticsSnapshot from a Hadoop filesystem.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fs</code> - filesystem</dd> |
| <dd><code>path</code> - path</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the loaded snapshot</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/UncheckedIOException.html?is-external=true" title="class or interface in java.io">UncheckedIOException</a></code> - Any IO exception.</dd> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> iostatisticsSnapshot_retrieve(<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <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> source)</pre> |
| <div class="block">Extract the IOStatistics from an object in a serializable form.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - source object, may be null/not a statistics source/instance</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a> or null if the object is null/doesn't have statistics</dd> |
| </dl> |
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| <pre>public static void iostatisticsSnapshot_save(<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> snapshot, |
| <a href="../../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> fs, |
| <a href="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> path, |
| boolean overwrite)</pre> |
| <div class="block">Save IOStatisticsSnapshot to a Hadoop filesystem as a JSON file.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>snapshot</code> - statistics</dd> |
| <dd><code>fs</code> - filesystem</dd> |
| <dd><code>path</code> - path</dd> |
| <dd><code>overwrite</code> - should any existing file be overwritten?</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/UncheckedIOException.html?is-external=true" title="class or interface in java.io">UncheckedIOException</a></code> - Any IO exception.</dd> |
| </dl> |
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| <pre>public static <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> iostatisticsSnapshot_toJsonString(<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> snapshot)</pre> |
| <div class="block">Save IOStatisticsSnapshot to a JSON string.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>snapshot</code> - statistics; may be null or of an incompatible type</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>JSON string value</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/UncheckedIOException.html?is-external=true" title="class or interface in java.io">UncheckedIOException</a></code> - Any IO/jackson exception.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the supplied class is not a snapshot</dd> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> iostatisticsSnapshot_fromJsonString(<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> json)</pre> |
| <div class="block">Load IOStatisticsSnapshot from a JSON string.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>json</code> - JSON string value.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>deserialized snapshot.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/UncheckedIOException.html?is-external=true" title="class or interface in java.io">UncheckedIOException</a></code> - Any IO/jackson exception.</dd> |
| </dl> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>> iostatistics_counters(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</pre> |
| <div class="block">Get the counters of an IOStatisticsSnapshot.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - source of statistics.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the map of counters.</dd> |
| </dl> |
| </li> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>> iostatistics_gauges(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</pre> |
| <div class="block">Get the gauges of an IOStatisticsSnapshot.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - source of statistics.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the map of gauges.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>> iostatistics_minimums(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</pre> |
| <div class="block">Get the minimums of an IOStatisticsSnapshot.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - source of statistics.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the map of minimums.</dd> |
| </dl> |
| </li> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>> iostatistics_maximums(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</pre> |
| <div class="block">Get the maximums of an IOStatisticsSnapshot.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - source of statistics.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the map of maximums.</dd> |
| </dl> |
| </li> |
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| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</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="https://docs.oracle.com/javase/8/docs/api/java/util/Map.Entry.html?is-external=true" title="class or interface in java.util">Map.Entry</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>>> iostatistics_means(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source)</pre> |
| <div class="block">Get the means of an IOStatisticsSnapshot. |
| Each value in the map is the (sample, sum) tuple of the values; |
| the mean is then calculated by dividing sum/sample wherever sample count is non-zero.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - source of statistics.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a map of mean key to (sample, sum) tuples.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>public static <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> iostatisticsContext_getCurrent()</pre> |
| <div class="block">Get the context's <code>IOStatisticsContext</code> which |
| implements <code>IOStatisticsSource</code>. |
| This is either a thread-local value or a global empty context.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>instance of <code>IOStatisticsContext</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>public static void iostatisticsContext_setThreadIOStatisticsContext(<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <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> statisticsContext)</pre> |
| <div class="block">Set the IOStatisticsContext for the current thread.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>statisticsContext</code> - IOStatistics context instance for the |
| current thread. If null, the context is reset.</dd> |
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| <h4>iostatisticsContext_enabled</h4> |
| <pre>public static boolean iostatisticsContext_enabled()</pre> |
| <div class="block">Static probe to check if the thread-level IO statistics enabled.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the thread-level IO statistics are enabled.</dd> |
| </dl> |
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| <h4>iostatisticsContext_reset</h4> |
| <pre>public static void iostatisticsContext_reset()</pre> |
| <div class="block">Reset the context's IOStatistics. |
| <code>IOStatisticsContext.reset()</code></div> |
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| <h4>iostatisticsContext_snapshot</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> iostatisticsContext_snapshot()</pre> |
| <div class="block">Take a snapshot of the context IOStatistics. |
| <code>IOStatisticsContext.snapshot()</code></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an instance of <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics"><code>IOStatisticsSnapshot</code></a>.</dd> |
| </dl> |
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| <h4>iostatisticsContext_aggregate</h4> |
| <pre>public static boolean iostatisticsContext_aggregate(<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> source)</pre> |
| <div class="block">Aggregate into the IOStatistics context the statistics passed in via |
| IOStatistics/source parameter. |
| <p> |
| Returns false if the source is null or does not contain any statistics.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - implementation of <code>IOStatisticsSource</code> or <a href="../../../../../org/apache/hadoop/fs/statistics/IOStatistics.html" title="interface in org.apache.hadoop.fs.statistics"><code>IOStatistics</code></a></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the the source object was aggregated.</dd> |
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| <h4>iostatistics_toPrettyString</h4> |
| <pre>public static <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> iostatistics_toPrettyString(<a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a> |
| <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> statistics)</pre> |
| <div class="block">Convert IOStatistics to a string form, with all the metrics sorted |
| and empty value stripped.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>statistics</code> - A statistics instance; may be null</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>string value or the empty string if null</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>applyToIOStatisticsSnapshot</h4> |
| <pre>public static <T> T applyToIOStatisticsSnapshot(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a> source, |
| org.apache.hadoop.util.functional.FunctionRaisingIOE<<a href="../../../../../org/apache/hadoop/fs/statistics/IOStatisticsSnapshot.html" title="class in org.apache.hadoop.fs.statistics">IOStatisticsSnapshot</a>,T> fun)</pre> |
| <div class="block">Apply a function to an object which may be an IOStatisticsSnapshot.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - return type</dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>source</code> - statistics snapshot</dd> |
| <dd><code>fun</code> - function to invoke if <code>source</code> is valid.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the applied value</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/UncheckedIOException.html?is-external=true" title="class or interface in java.io">UncheckedIOException</a></code> - Any IO exception.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the supplied class is not a snapshot</dd> |
| </dl> |
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