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apache / hadoop-site / 952d547359cafef280f0a0324055741b2ed55be1 / . / content / docs / r3.3.1 / hadoop-project-dist / hadoop-hdfs / build / source / hadoop-hdfs-project / hadoop-hdfs / target / api / org / apache / hadoop / hdfs / qjournal / server / Journal.html
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<div class="subTitle">org.apache.hadoop.hdfs.qjournal.server</div>
<h2 title="Class Journal" class="title">Class Journal</h2>
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<li>org.apache.hadoop.hdfs.qjournal.server.Journal</li>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></dd>
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<pre>public class <span class="typeNameLabel">Journal</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>
implements <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre>
<div class="block">A JournalNode can manage journals for several clusters at once.
Each such journal is entirely independent despite being hosted by
the same JVM.</div>
</li>
</ul>
</div>
<div class="summary">
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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">&nbsp;</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>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/hdfs/qjournal/server/Journal.html#LAST_PROMISED_FILENAME">LAST_PROMISED_FILENAME</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<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/hdfs/qjournal/server/Journal.html#LAST_WRITER_EPOCH">LAST_WRITER_EPOCH</a></span></code>&nbsp;</td>
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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">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</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>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#acceptRecovery-org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo-org.apache.hadoop.hdfs.qjournal.protocol.QJournalProtocolProtos.SegmentStateProto-java.net.URL-">acceptRecovery</a></span>(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
<a href="../../../../../../org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocolProtos.SegmentStateProto.html" title="class in org.apache.hadoop.hdfs.qjournal.protocol">QJournalProtocolProtos.SegmentStateProto</a>&nbsp;segment,
<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URL.html?is-external=true" title="class or interface in java.net">URL</a>&nbsp;fromUrl)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#canRollBack-org.apache.hadoop.hdfs.server.common.StorageInfo-org.apache.hadoop.hdfs.server.common.StorageInfo-int-">canRollBack</a></span>(org.apache.hadoop.hdfs.server.common.StorageInfo&nbsp;storage,
org.apache.hadoop.hdfs.server.common.StorageInfo&nbsp;prevStorage,
int&nbsp;targetLayoutVersion)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#close--">close</a></span>()</code>
<div class="block">Unlock and release resources.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#doFinalize--">doFinalize</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#doPreUpgrade--">doPreUpgrade</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#doRollback--">doRollback</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#doUpgrade-org.apache.hadoop.hdfs.server.common.StorageInfo-">doUpgrade</a></span>(org.apache.hadoop.hdfs.server.common.StorageInfo&nbsp;sInfo)</code>&nbsp;</td>
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<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#finalizeLogSegment-org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo-long-long-">finalizeLogSegment</a></span>(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;startTxId,
long&nbsp;endTxId)</code>
<div class="block">Finalize the log segment at the given transaction ID.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/server/protocol/RemoteEditLogManifest.html" title="class in org.apache.hadoop.hdfs.server.protocol">RemoteEditLogManifest</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#getEditLogManifest-long-boolean-">getEditLogManifest</a></span>(long&nbsp;sinceTxId,
boolean&nbsp;inProgressOk)</code>&nbsp;</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><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/hdfs/qjournal/server/Journal.html#getJournalCTime--">getJournalCTime</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocolProtos.GetJournaledEditsResponseProto.html" title="class in org.apache.hadoop.hdfs.qjournal.protocol">QJournalProtocolProtos.GetJournaledEditsResponseProto</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#getJournaledEdits-long-int-">getJournaledEdits</a></span>(long&nbsp;sinceTxId,
int&nbsp;maxTxns)</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#getLastWriterEpoch--">getLastWriterEpoch</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#getTriedJournalSyncerStartedwithnsId--">getTriedJournalSyncerStartedwithnsId</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#heartbeat-org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo-">heartbeat</a></span>(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo)</code>&nbsp;</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#isFormatted--">isFormatted</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocolProtos.PrepareRecoveryResponseProto.html" title="class in org.apache.hadoop.hdfs.qjournal.protocol">QJournalProtocolProtos.PrepareRecoveryResponseProto</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#prepareRecovery-org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo-long-">prepareRecovery</a></span>(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;segmentTxId)</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#purgeLogsOlderThan-org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo-long-">purgeLogsOlderThan</a></span>(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;minTxIdToKeep)</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#setTriedJournalSyncerStartedwithnsId-boolean-">setTriedJournalSyncerStartedwithnsId</a></span>(boolean&nbsp;started)</code>&nbsp;</td>
</tr>
<tr id="i18" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hdfs/qjournal/server/Journal.html#startLogSegment-org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo-long-int-">startLogSegment</a></span>(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;txid,
int&nbsp;layoutVersion)</code>
<div class="block">Start a new segment at the given txid.</div>
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<h3>Methods inherited from class&nbsp;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#toString--" title="class or interface in java.lang">toString</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>
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<h4>LAST_PROMISED_FILENAME</h4>
<pre>public static final&nbsp;<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> LAST_PROMISED_FILENAME</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hdfs.qjournal.server.Journal.LAST_PROMISED_FILENAME">Constant Field Values</a></dd>
</dl>
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<h4>LAST_WRITER_EPOCH</h4>
<pre>public static final&nbsp;<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> LAST_WRITER_EPOCH</pre>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hdfs.qjournal.server.Journal.LAST_WRITER_EPOCH">Constant Field Values</a></dd>
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<h4>setTriedJournalSyncerStartedwithnsId</h4>
<pre>public&nbsp;void&nbsp;setTriedJournalSyncerStartedwithnsId(boolean&nbsp;started)</pre>
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<h4>getTriedJournalSyncerStartedwithnsId</h4>
<pre>public&nbsp;boolean&nbsp;getTriedJournalSyncerStartedwithnsId()</pre>
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<a name="close--">
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<h4>close</h4>
<pre>public&nbsp;void&nbsp;close()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Unlock and release resources.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code>&nbsp;in interface&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getLastWriterEpoch</h4>
<pre>public&nbsp;long&nbsp;getLastWriterEpoch()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>heartbeat</h4>
<pre>public&nbsp;void&nbsp;heartbeat(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>isFormatted</h4>
<pre>public&nbsp;boolean&nbsp;isFormatted()</pre>
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<h4>startLogSegment</h4>
<pre>public&nbsp;void&nbsp;startLogSegment(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;txid,
int&nbsp;layoutVersion)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Start a new segment at the given txid. The previous segment
must have already been finalized.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>finalizeLogSegment</h4>
<pre>public&nbsp;void&nbsp;finalizeLogSegment(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;startTxId,
long&nbsp;endTxId)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<div class="block">Finalize the log segment at the given transaction ID.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>purgeLogsOlderThan</h4>
<pre>public&nbsp;void&nbsp;purgeLogsOlderThan(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;minTxIdToKeep)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>LogsPurgeable.purgeLogsOlderThan(long)</code></dd>
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<h4>getEditLogManifest</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/server/protocol/RemoteEditLogManifest.html" title="class in org.apache.hadoop.hdfs.server.protocol">RemoteEditLogManifest</a>&nbsp;getEditLogManifest(long&nbsp;sinceTxId,
boolean&nbsp;inProgressOk)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>QJournalProtocol.getEditLogManifest(String, String, long, boolean)</code></dd>
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<h4>getJournaledEdits</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocolProtos.GetJournaledEditsResponseProto.html" title="class in org.apache.hadoop.hdfs.qjournal.protocol">QJournalProtocolProtos.GetJournaledEditsResponseProto</a>&nbsp;getJournaledEdits(long&nbsp;sinceTxId,
int&nbsp;maxTxns)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>QJournalProtocol.getJournaledEdits(String, String, long, int)</code></dd>
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<h4>prepareRecovery</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocolProtos.PrepareRecoveryResponseProto.html" title="class in org.apache.hadoop.hdfs.qjournal.protocol">QJournalProtocolProtos.PrepareRecoveryResponseProto</a>&nbsp;prepareRecovery(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
long&nbsp;segmentTxId)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>QJournalProtocol.prepareRecovery(RequestInfo, long)</code></dd>
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<h4>acceptRecovery</h4>
<pre>public&nbsp;void&nbsp;acceptRecovery(org.apache.hadoop.hdfs.qjournal.protocol.RequestInfo&nbsp;reqInfo,
<a href="../../../../../../org/apache/hadoop/hdfs/qjournal/protocol/QJournalProtocolProtos.SegmentStateProto.html" title="class in org.apache.hadoop.hdfs.qjournal.protocol">QJournalProtocolProtos.SegmentStateProto</a>&nbsp;segment,
<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URL.html?is-external=true" title="class or interface in java.net">URL</a>&nbsp;fromUrl)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><code>QJournalProtocol.acceptRecovery(RequestInfo, QJournalProtocolProtos.SegmentStateProto, URL)</code></dd>
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<h4>doPreUpgrade</h4>
<pre>public&nbsp;void&nbsp;doPreUpgrade()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>doUpgrade</h4>
<pre>public&nbsp;void&nbsp;doUpgrade(org.apache.hadoop.hdfs.server.common.StorageInfo&nbsp;sInfo)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>doFinalize</h4>
<pre>public&nbsp;void&nbsp;doFinalize()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>canRollBack</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html?is-external=true" title="class or interface in java.lang">Boolean</a>&nbsp;canRollBack(org.apache.hadoop.hdfs.server.common.StorageInfo&nbsp;storage,
org.apache.hadoop.hdfs.server.common.StorageInfo&nbsp;prevStorage,
int&nbsp;targetLayoutVersion)
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>doRollback</h4>
<pre>public&nbsp;void&nbsp;doRollback()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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<h4>getJournalCTime</h4>
<pre>public&nbsp;<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>&nbsp;getJournalCTime()
throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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