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| <div class="subTitle">org.apache.hadoop.hbase.regionserver.wal</div> |
| <h2 title="Class SyncFuture" class="title">Class SyncFuture</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.hadoop.hbase.regionserver.wal.SyncFuture</li> |
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| <pre>@InterfaceAudience.Private |
| class <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.47">SyncFuture</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">A Future on a filesystem sync call. It given to a client or 'Handler' for it to wait on till the |
| sync completes. |
| <p> |
| Handlers coming in call append, append, append, and then do a flush/sync of the edits they have |
| appended the WAL before returning. Since sync takes a while to complete, we give the Handlers |
| back this sync future to wait on until the actual HDFS sync completes. Meantime this sync future |
| goes across a queue and is handled by a background thread; when it completes, it finishes up the |
| future, the handler get or failed check completes and the Handler can then progress. |
| <p> |
| This is just a partial implementation of Future; we just implement get and failure. |
| <p> |
| There is not a one-to-one correlation between dfs sync invocations and instances of this class. A |
| single dfs sync call may complete and mark many SyncFutures as done; i.e. we batch up sync calls |
| rather than do a dfs sync call every time a Handler asks for it. |
| <p> |
| SyncFutures are immutable but recycled. Call #reset(long, Span) before use even if it the first |
| time, start the sync, then park the 'hitched' thread on a call to #get().</div> |
| </li> |
| </ul> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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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/util/concurrent/locks/Condition.html?is-external=true" title="class or interface in java.util.concurrent.locks">Condition</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#doneCondition">doneCondition</a></span></code> |
| <div class="block">Condition to wait on for client threads.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/ReentrantLock.html?is-external=true" title="class or interface in java.util.concurrent.locks">ReentrantLock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#doneLock">doneLock</a></span></code> |
| <div class="block">Lock protecting the thread-safe fields.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#doneTxid">doneTxid</a></span></code> |
| <div class="block">The transaction id that was set in here when we were marked done.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#forceSync">forceSync</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#NOT_DONE">NOT_DONE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#t">t</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#throwable">throwable</a></span></code> |
| <div class="block">If error, the associated throwable.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#txid">txid</a></span></code> |
| <div class="block">The transaction id of this operation, monotonically increases.</div> |
| </td> |
| </tr> |
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| </li> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#SyncFuture--">SyncFuture</a></span>()</code> </td> |
| </tr> |
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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="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>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#done-long-java.lang.Throwable-">done</a></span>(long txid, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a> t)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#get-long-">get</a></span>(long timeoutNs)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#getThread--">getThread</a></span>()</code> |
| <div class="block">Returns the thread that owned this sync future, use with caution as we return the reference to |
| the actual thread object.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#getThrowable--">getThrowable</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>(package private) long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#getTxid--">getTxid</a></span>()</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#isDone--">isDone</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>(package private) boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#isForceSync--">isForceSync</a></span>()</code> </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html" title="class in org.apache.hadoop.hbase.regionserver.wal">SyncFuture</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#reset-long-boolean-">reset</a></span>(long txid, |
| boolean forceSync)</code> |
| <div class="block">Call this method to clear old usage and get it ready for new deploy.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <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/regionserver/wal/SyncFuture.html#toString--">toString</a></span>()</code> </td> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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| <div class="details"> |
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| <!-- ============ FIELD DETAIL =========== --> |
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| <h3>Field Detail</h3> |
| <a name="NOT_DONE"> |
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| <li class="blockList"> |
| <h4>NOT_DONE</h4> |
| <pre>private static final long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.49">NOT_DONE</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.regionserver.wal.SyncFuture.NOT_DONE">Constant Field Values</a></dd> |
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| <pre>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.50">t</a></pre> |
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| <h4>doneLock</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/ReentrantLock.html?is-external=true" title="class or interface in java.util.concurrent.locks">ReentrantLock</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.55">doneLock</a></pre> |
| <div class="block">Lock protecting the thread-safe fields.</div> |
| </li> |
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| <a name="doneCondition"> |
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| <h4>doneCondition</h4> |
| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Condition.html?is-external=true" title="class or interface in java.util.concurrent.locks">Condition</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.60">doneCondition</a></pre> |
| <div class="block">Condition to wait on for client threads.</div> |
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| <pre>private long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.70">doneTxid</a></pre> |
| <div class="block">The transaction id that was set in here when we were marked done. Should be equal or > txnId. |
| Put this data member into the NOT_DONE state while this class is in use.</div> |
| </li> |
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| <a name="throwable"> |
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| </a> |
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| <h4>throwable</h4> |
| <pre>private <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.75">throwable</a></pre> |
| <div class="block">If error, the associated throwable. Set when the future is 'done'.</div> |
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| <h4>txid</h4> |
| <pre>private long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.85">txid</a></pre> |
| <div class="block">The transaction id of this operation, monotonically increases.</div> |
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| <pre>private boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.87">forceSync</a></pre> |
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| <h4>SyncFuture</h4> |
| <pre><a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.89">SyncFuture</a>()</pre> |
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| <h4>reset</h4> |
| <pre><a href="../../../../../../org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html" title="class in org.apache.hadoop.hbase.regionserver.wal">SyncFuture</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.100">reset</a>(long txid, |
| boolean forceSync)</pre> |
| <div class="block">Call this method to clear old usage and get it ready for new deploy.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>txid</code> - the new transaction id</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>this</dd> |
| </dl> |
| </li> |
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| <a name="toString--"> |
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| <h4>toString</h4> |
| <pre>public <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/regionserver/wal/SyncFuture.html#line.116">toString</a>()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code> in class <code><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></dd> |
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| <pre>long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.121">getTxid</a>()</pre> |
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| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.125">isForceSync</a>()</pre> |
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| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang">Thread</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.134">getThread</a>()</pre> |
| <div class="block">Returns the thread that owned this sync future, use with caution as we return the reference to |
| the actual thread object.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the associated thread instance.</dd> |
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| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.144">done</a>(long txid, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Throwable.html?is-external=true" title="class or interface in java.lang">Throwable</a> t)</pre> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>txid</code> - the transaction id at which this future 'completed'.</dd> |
| <dd><code>t</code> - Can be null. Set if we are 'completing' on error (and this 't' is the error).</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>True if we successfully marked this outstanding future as completed/done. Returns false |
| if this future is already 'done' when this method called.</dd> |
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| <pre>long <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.167">get</a>(long timeoutNs) |
| 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>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a>, |
| <a href="../../../../../../org/apache/hadoop/hbase/exceptions/TimeoutIOException.html" title="class in org.apache.hadoop.hbase.exceptions">TimeoutIOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><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></code></dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutionException.html?is-external=true" title="class or interface in java.util.concurrent">ExecutionException</a></code></dd> |
| <dd><code><a href="../../../../../../org/apache/hadoop/hbase/exceptions/TimeoutIOException.html" title="class in org.apache.hadoop.hbase.exceptions">TimeoutIOException</a></code></dd> |
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| <pre>boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/wal/SyncFuture.html#line.187">isDone</a>()</pre> |
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