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<h2 title="Class TestIOFencing" class="title">Class TestIOFencing</h2>
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<pre>public class <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.84">TestIOFencing</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">Test for the case where a regionserver going down has enough cycles to do damage to regions that
have actually been assigned elsehwere.
<p>
If we happen to assign a region before it fully done with in its old location -- i.e. it is on
two servers at the same time -- all can work fine until the case where the region on the dying
server decides to compact or otherwise change the region file set. The region in its new location
will then get a surprise when it tries to do something w/ a file removed by the region in its old
location on dying server.
<p>
Making a test for this case is a little tough in that even if a file is deleted up on the
namenode, if the file was opened before the delete, it will continue to let reads happen until
something changes the state of cached blocks in the dfsclient that was already open (a block from
the deleted file is cleaned from the datanode by NN).
<p>
What we will do below is do an explicit check for existence on the files listed in the region
that has had some files removed because of a compaction. This sort of hurry's along and makes
certain what is a chance occurance.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.BlockCompactionsInCompletionHStore.html" title="class in org.apache.hadoop.hbase">TestIOFencing.BlockCompactionsInCompletionHStore</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.BlockCompactionsInCompletionRegion.html" title="class in org.apache.hadoop.hbase">TestIOFencing.BlockCompactionsInCompletionRegion</a></span></code>
<div class="block">An override of HRegion that allows us park compactions in a holding pattern and
then when appropriate for the test, allow them proceed again.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.BlockCompactionsInPrepRegion.html" title="class in org.apache.hadoop.hbase">TestIOFencing.BlockCompactionsInPrepRegion</a></span></code>
<div class="block">An override of HRegion that allows us park compactions in a holding pattern and
then when appropriate for the test, allow them proceed again.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.CompactionBlockerRegion.html" title="class in org.apache.hadoop.hbase">TestIOFencing.CompactionBlockerRegion</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/hbase/HBaseClassTestRule.html" title="class in org.apache.hadoop.hbase">HBaseClassTestRule</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#CLASS_RULE">CLASS_RULE</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static byte[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#FAMILY">FAMILY</a></span></code>&nbsp;</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/TestIOFencing.html#FIRST_BATCH_COUNT">FIRST_BATCH_COUNT</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static org.slf4j.Logger</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#LOG">LOG</a></span></code>&nbsp;</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/TestIOFencing.html#SECOND_BATCH_COUNT">SECOND_BATCH_COUNT</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static org.apache.hadoop.hbase.TableName</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#TABLE_NAME">TABLE_NAME</a></span></code>&nbsp;</td>
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<td class="colFirst"><code>private static <a href="../../../../org/apache/hadoop/hbase/HBaseTestingUtil.html" title="class in org.apache.hadoop.hbase">HBaseTestingUtil</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#TEST_UTIL">TEST_UTIL</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#TestIOFencing--">TestIOFencing</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#doTest-java.lang.Class-org.apache.hadoop.hbase.MemoryCompactionPolicy-">doTest</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;&nbsp;regionClass,
org.apache.hadoop.hbase.MemoryCompactionPolicy&nbsp;policy)</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#testFencingAroundCompaction--">testFencingAroundCompaction</a></span>()</code>
<div class="block">Test that puts up a regionserver, starts a compaction on a loaded region but holds the
compaction until after we have killed the server and the region has come up on
a new regionserver altogether.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/hbase/TestIOFencing.html#testFencingAroundCompactionAfterWALSync--">testFencingAroundCompactionAfterWALSync</a></span>()</code>
<div class="block">Test that puts up a regionserver, starts a compaction on a loaded region but holds the
compaction completion until after we have killed the server and the region has come up on
a new regionserver altogether.</div>
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<pre>public static final&nbsp;<a href="../../../../org/apache/hadoop/hbase/HBaseClassTestRule.html" title="class in org.apache.hadoop.hbase">HBaseClassTestRule</a> <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.87">CLASS_RULE</a></pre>
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<pre>private static final&nbsp;org.slf4j.Logger <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.90">LOG</a></pre>
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<pre>private static final&nbsp;<a href="../../../../org/apache/hadoop/hbase/HBaseTestingUtil.html" title="class in org.apache.hadoop.hbase">HBaseTestingUtil</a> <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.224">TEST_UTIL</a></pre>
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<pre>private static final&nbsp;org.apache.hadoop.hbase.TableName <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.225">TABLE_NAME</a></pre>
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<pre>private static final&nbsp;byte[] <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.227">FAMILY</a></pre>
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<pre>private static final&nbsp;int <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.228">FIRST_BATCH_COUNT</a></pre>
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<pre>private static final&nbsp;int <a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.229">SECOND_BATCH_COUNT</a></pre>
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<pre>public&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.84">TestIOFencing</a>()</pre>
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<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.238">testFencingAroundCompaction</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Test that puts up a regionserver, starts a compaction on a loaded region but holds the
compaction until after we have killed the server and the region has come up on
a new regionserver altogether. This fakes the double assignment case where region in one
location changes the files out from underneath a region being served elsewhere.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.251">testFencingAroundCompactionAfterWALSync</a>()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Test that puts up a regionserver, starts a compaction on a loaded region but holds the
compaction completion until after we have killed the server and the region has come up on
a new regionserver altogether. This fakes the double assignment case where region in one
location changes the files out from underneath a region being served elsewhere.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/hadoop/hbase/TestIOFencing.html#line.257">doTest</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a>&lt;?&gt;&nbsp;regionClass,
org.apache.hadoop.hbase.MemoryCompactionPolicy&nbsp;policy)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd>
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