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| <div class="subTitle">org.apache.hadoop.yarn.server.timelineservice.storage.common</div> |
| <h2 title="Class TimestampGenerator" class="title">Class TimestampGenerator</h2> |
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| <pre>public class <span class="typeNameLabel">TimestampGenerator</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">Utility class that allows HBase coprocessors to interact with unique |
| timestamps.</div> |
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| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/timelineservice/storage/common/TimestampGenerator.html#TS_MULTIPLIER">TS_MULTIPLIER</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/timelineservice/storage/common/TimestampGenerator.html#TimestampGenerator--">TimestampGenerator</a></span>()</code> </td> |
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| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/timelineservice/storage/common/TimestampGenerator.html#currentTime--">currentTime</a></span>()</code> |
| <div class="block">Returns the current wall clock time in milliseconds, multiplied by the |
| required precision.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/timelineservice/storage/common/TimestampGenerator.html#getSupplementedTimestamp-long-java.lang.String-">getSupplementedTimestamp</a></span>(long incomingTS, |
| <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> appId)</code> |
| <div class="block">Returns a timestamp multiplied with TS_MULTIPLIER and last few digits of |
| application id.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/timelineservice/storage/common/TimestampGenerator.html#getTruncatedTimestamp-long-">getTruncatedTimestamp</a></span>(long incomingTS)</code> |
| <div class="block">truncates the last few digits of the timestamp which were supplemented by |
| the TimestampGenerator#getSupplementedTimestamp function.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/hadoop/yarn/server/timelineservice/storage/common/TimestampGenerator.html#getUniqueTimestamp--">getUniqueTimestamp</a></span>()</code> |
| <div class="block">Returns a timestamp value unique within the scope of this |
| <code>TimestampGenerator</code> instance.</div> |
| </td> |
| </tr> |
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| <a name="TS_MULTIPLIER"> |
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| <h4>TS_MULTIPLIER</h4> |
| <pre>public static final long TS_MULTIPLIER</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../../../constant-values.html#org.apache.hadoop.yarn.server.timelineservice.storage.common.TimestampGenerator.TS_MULTIPLIER">Constant Field Values</a></dd> |
| </dl> |
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| <a name="TimestampGenerator--"> |
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| </a> |
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| <h4>TimestampGenerator</h4> |
| <pre>public TimestampGenerator()</pre> |
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| <h4>currentTime</h4> |
| <pre>public long currentTime()</pre> |
| <div class="block">Returns the current wall clock time in milliseconds, multiplied by the |
| required precision.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>current timestamp.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getUniqueTimestamp--"> |
| <!-- --> |
| </a> |
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| <h4>getUniqueTimestamp</h4> |
| <pre>public long getUniqueTimestamp()</pre> |
| <div class="block">Returns a timestamp value unique within the scope of this |
| <code>TimestampGenerator</code> instance. For usage by HBase |
| <code>RegionObserver</code> coprocessors, this normally means unique within a |
| given region. |
| |
| Unlikely scenario of generating a non-unique timestamp: if there is a |
| sustained rate of more than 1M hbase writes per second AND if region fails |
| over within that time range of timestamps being generated then there may be |
| collisions writing to a cell version of the same column.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>unique timestamp.</dd> |
| </dl> |
| </li> |
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| <h4>getSupplementedTimestamp</h4> |
| <pre>public static long getSupplementedTimestamp(long incomingTS, |
| <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> appId)</pre> |
| <div class="block">Returns a timestamp multiplied with TS_MULTIPLIER and last few digits of |
| application id. |
| |
| Unlikely scenario of generating a timestamp that is a duplicate: If more |
| than a 1M concurrent apps are running in one flow run AND write to same |
| column at the same time, then say appId of 1M and 1 will overlap |
| with appId of 001 and there may be collisions for that flow run's |
| specific column.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>incomingTS</code> - Timestamp to be converted.</dd> |
| <dd><code>appId</code> - Application Id.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a timestamp multiplied with TS_MULTIPLIER and last few digits of |
| application id</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getTruncatedTimestamp</h4> |
| <pre>public static long getTruncatedTimestamp(long incomingTS)</pre> |
| <div class="block">truncates the last few digits of the timestamp which were supplemented by |
| the TimestampGenerator#getSupplementedTimestamp function.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>incomingTS</code> - Timestamp to be truncated.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a truncated timestamp value</dd> |
| </dl> |
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