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<div class="subTitle">org.apache.geode.cache</div>
<h2 title="Interface DiskStore" class="title">Interface DiskStore</h2>
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<pre>public interface <span class="typeNameLabel">DiskStore</span></pre>
<div class="block">Provides disk storage for one or more regions. The regions in the same disk store will share the
same disk persistence attributes. A region without a disk store name belongs to the default disk
store.
<p>
Instances of this interface are created using <a href="../../../../org/apache/geode/cache/DiskStoreFactory.html#create-java.lang.String-"><code>DiskStoreFactory.create(java.lang.String)</code></a>. So to create a
<code>DiskStore</code> named <code>myDiskStore</code> do this:
<PRE>
new DiskStoreFactory().create("myDiskStore");
</PRE>
<p>
Existing DiskStore instances can be found using <a href="../../../../org/apache/geode/cache/GemFireCache.html#findDiskStore-java.lang.String-"><code>GemFireCache.findDiskStore(String)</code></a></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 6.5</dd>
</dl>
</li>
</ul>
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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="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract 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/geode/cache/DiskStore.html#destroy--">destroy</a></span>()</code>
<div class="block">Destroys this disk store.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#flush--">flush</a></span>()</code>
<div class="block">Causes any data that is currently in the asynchronous queue to be written to disk.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#forceCompaction--">forceCompaction</a></span>()</code>
<div class="block">Allows a disk compaction to be forced on this disk store.</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/geode/cache/DiskStore.html#forceRoll--">forceRoll</a></span>()</code>
<div class="block">Asks the disk store to start writing to a new oplog.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getAllowForceCompaction--">getAllowForceCompaction</a></span>()</code>
<div class="block">Returns true if manual compaction of disk files is allowed on this region.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getAutoCompact--">getAutoCompact</a></span>()</code>
<div class="block">Returns true if the disk files are to be automatically compacted.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getCompactionThreshold--">getCompactionThreshold</a></span>()</code>
<div class="block">Returns the threshold at which an oplog will become compactable.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getDiskDirs--">getDiskDirs</a></span>()</code>
<div class="block">Returns the directories to which the region's data are written.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getDiskDirSizes--">getDiskDirSizes</a></span>()</code>
<div class="block">Returns the sizes of the disk directories in megabytes</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getDiskStoreUUID--">getDiskStoreUUID</a></span>()</code>
<div class="block">Returns the universally unique identifier for the Disk Store across the GemFire distributed
system.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getDiskUsageCriticalPercentage--">getDiskUsageCriticalPercentage</a></span>()</code>
<div class="block">Returns the critical threshold for disk usage as a percentage of the total disk volume.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>float</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getDiskUsageWarningPercentage--">getDiskUsageWarningPercentage</a></span>()</code>
<div class="block">Returns the warning threshold for disk usage as a percentage of the total disk volume.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getMaxOplogSize--">getMaxOplogSize</a></span>()</code>
<div class="block">Get the maximum size in megabytes a single oplog (operation log) file should be</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<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/geode/cache/DiskStore.html#getName--">getName</a></span>()</code>
<div class="block">Get the name of the DiskStore</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getQueueSize--">getQueueSize</a></span>()</code>
<div class="block">Returns the maximum number of operations that can be asynchronously queued to be written to
disk.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getTimeInterval--">getTimeInterval</a></span>()</code>
<div class="block">Returns the number of milliseconds that can elapse before unwritten data is written to disk.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/geode/cache/DiskStore.html#getWriteBufferSize--">getWriteBufferSize</a></span>()</code>
<div class="block">Returns the size of the write buffer that this disk store will use when writing data to disk.</div>
</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/geode/cache/DiskStore.html#setDiskUsageCriticalPercentage-float-">setDiskUsageCriticalPercentage</a></span>(float&nbsp;criticalPercent)</code>
<div class="block">Sets the value of the disk usage critical percentage.</div>
</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/geode/cache/DiskStore.html#setDiskUsageWarningPercentage-float-">setDiskUsageWarningPercentage</a></span>(float&nbsp;warningPercent)</code>
<div class="block">Sets the value of the disk usage warning percentage.</div>
</td>
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<h4>getName</h4>
<pre><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>&nbsp;getName()</pre>
<div class="block">Get the name of the DiskStore</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the name of the DiskStore</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/geode/cache/DiskStoreFactory.html#create-java.lang.String-"><code>DiskStoreFactory.create(java.lang.String)</code></a></dd>
</dl>
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<h4>getAutoCompact</h4>
<pre>boolean&nbsp;getAutoCompact()</pre>
<div class="block">Returns true if the disk files are to be automatically compacted.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns true if the disk files are to be automatically compacted; false if automatic
compaction is turned off</dd>
</dl>
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<a name="getCompactionThreshold--">
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<h4>getCompactionThreshold</h4>
<pre>int&nbsp;getCompactionThreshold()</pre>
<div class="block">Returns the threshold at which an oplog will become compactable. Until it reaches this
threshold the oplog will not be compacted. The threshold is a percentage in the range 0..100.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the threshold, as a percentage, at which an oplog is considered compactable.</dd>
</dl>
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<h4>getAllowForceCompaction</h4>
<pre>boolean&nbsp;getAllowForceCompaction()</pre>
<div class="block">Returns true if manual compaction of disk files is allowed on this region. Manual compaction is
done be calling <a href="../../../../org/apache/geode/cache/DiskStore.html#forceCompaction--"><code>forceCompaction()</code></a>.
<p>
Note that calls to <a href="../../../../org/apache/geode/cache/DiskStore.html#forceCompaction--"><code>forceCompaction()</code></a> will also be allowed if <a href="../../../../org/apache/geode/cache/DiskStore.html#getAutoCompact--"><code>automatic compaction</code></a> is enabled.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns true if manual compaction of disk files is allowed on this region.</dd>
</dl>
</li>
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<a name="getMaxOplogSize--">
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<h4>getMaxOplogSize</h4>
<pre>long&nbsp;getMaxOplogSize()</pre>
<div class="block">Get the maximum size in megabytes a single oplog (operation log) file should be</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maximum size in megabyte the operations log file can be</dd>
</dl>
</li>
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<a name="getTimeInterval--">
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<h4>getTimeInterval</h4>
<pre>long&nbsp;getTimeInterval()</pre>
<div class="block">Returns the number of milliseconds that can elapse before unwritten data is written to disk.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns the time interval in milliseconds that can elapse between two writes to disk</dd>
</dl>
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<h4>getWriteBufferSize</h4>
<pre>int&nbsp;getWriteBufferSize()</pre>
<div class="block">Returns the size of the write buffer that this disk store will use when writing data to disk.
Larger values may increase performance but will use more memory. The disk store will allocate
one direct memory buffer of this size.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Returns the size of the write buffer.</dd>
</dl>
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<h4>getDiskDirs</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/io/File.html?is-external=true" title="class or interface in java.io">File</a>[]&nbsp;getDiskDirs()</pre>
<div class="block">Returns the directories to which the region's data are written. If multiple directories are
used, GemFire will attempt to distribute the data evenly amongst them.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the directories to which the region's data are written</dd>
</dl>
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<h4>getDiskDirSizes</h4>
<pre>int[]&nbsp;getDiskDirSizes()</pre>
<div class="block">Returns the sizes of the disk directories in megabytes</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the sizes of the disk directories in megabytes</dd>
</dl>
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<a name="getDiskStoreUUID--">
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<h4>getDiskStoreUUID</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util">UUID</a>&nbsp;getDiskStoreUUID()</pre>
<div class="block">Returns the universally unique identifier for the Disk Store across the GemFire distributed
system.
<p></div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a UUID uniquely identifying this Disk Store in the GemFire distributed system.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html?is-external=true" title="class or interface in java.util"><code>UUID</code></a></dd>
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<pre>int&nbsp;getQueueSize()</pre>
<div class="block">Returns the maximum number of operations that can be asynchronously queued to be written to
disk. When this limit is reached, it will cause operations to block until they can be put in
the queue. If this <code>DiskStore</code> configures synchronous writing, then
<code>queueSize</code> is ignored.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the maxinum number of entries that can be queued concurrently for asynchronous writting
to disk.</dd>
</dl>
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<h4>flush</h4>
<pre>void&nbsp;flush()</pre>
<div class="block">Causes any data that is currently in the asynchronous queue to be written to disk. Does not
return until the flush is complete.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../../org/apache/geode/cache/DiskAccessException.html" title="class in org.apache.geode.cache">DiskAccessException</a></code> - If problems are encounter while writing to disk</dd>
</dl>
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<h4>forceRoll</h4>
<pre>void&nbsp;forceRoll()</pre>
<div class="block">Asks the disk store to start writing to a new oplog. The old oplog will be asynchronously
compressed if compaction is set to true. The new oplog will be created in the next available
directory with free space. If there is no directory with free space available and compaction is
set to false, then a <code>DiskAccessException</code> saying that the disk is full will be
thrown. If compaction is true then the application will wait for the other oplogs to be
compacted and more space to be created.</div>
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<h4>forceCompaction</h4>
<pre>boolean&nbsp;forceCompaction()</pre>
<div class="block">Allows a disk compaction to be forced on this disk store. The compaction is done even if
automatic compaction is not configured. If the current active oplog has had data written to it
and it is compactable then an implicit call to <a href="../../../../org/apache/geode/cache/DiskStore.html#forceRoll--"><code>forceRoll()</code></a> will be made so that the
active oplog can be compacted.
<P>
This method will block until the compaction completes.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if one or more oplogs were compacted; <code>false</code> indicates
that no oplogs were ready to be compacted or that a compaction was already in progress.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/geode/cache/DiskStore.html#getAllowForceCompaction--"><code>getAllowForceCompaction()</code></a></dd>
</dl>
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<h4>destroy</h4>
<pre>void&nbsp;destroy()</pre>
<div class="block">Destroys this disk store. Removes the disk store from the cache, and removes all files related
to the disk store from disk.
If there are any currently open regions in the disk store this method will throw an exception.
If there are any closed regions that are persisted in this disk store, the data for those
regions will be destroyed.</div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the disk store is currently in use by any regions, gateway
senders, or a PDX type registry.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 8.0</dd>
</dl>
</li>
</ul>
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<h4>getDiskUsageWarningPercentage</h4>
<pre>float&nbsp;getDiskUsageWarningPercentage()</pre>
<div class="block">Returns the warning threshold for disk usage as a percentage of the total disk volume.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the warning percent</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 8.0</dd>
</dl>
</li>
</ul>
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<h4>getDiskUsageCriticalPercentage</h4>
<pre>float&nbsp;getDiskUsageCriticalPercentage()</pre>
<div class="block">Returns the critical threshold for disk usage as a percentage of the total disk volume.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the critical percent</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>GemFire 8.0</dd>
</dl>
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<h4>setDiskUsageWarningPercentage</h4>
<pre>void&nbsp;setDiskUsageWarningPercentage(float&nbsp;warningPercent)</pre>
<div class="block">Sets the value of the disk usage warning percentage.</div>
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<h4>setDiskUsageCriticalPercentage</h4>
<pre>void&nbsp;setDiskUsageCriticalPercentage(float&nbsp;criticalPercent)</pre>
<div class="block">Sets the value of the disk usage critical percentage.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>criticalPercent</code> - the critical percent</dd>
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