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title="class or interface in java.lang">Object</a> implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/IOEngine.html" title="interface in org.apache.hadoop.hbase.io.hfile.bucket">IOEngine</a></pre> <div class="block">IO engine that stores data in memory using an array of ByteBuffers - <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a></div> + <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a>. + +<h2>How it Works</h2> + First, see <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a> and how it gives a view across multiple ByteBuffers managed + by it internally. This class does the physical BB create and the write and read to the + underlying BBs. So we will create N BBs based on the total BC capacity specified on create + of the ByteBufferArray. So say we have 10 GB of off heap BucketCache, we will create 2560 such + BBs inside our ByteBufferArray. + + <p>Now the way BucketCache works is that the entire 10 GB is split into diff sized buckets: by + default from 5 KB to 513 KB. Within each bucket of a particular size, there are + usually more than one bucket 'block'. The way it is calculate in bucketcache is that the total + bucketcache size is divided by 4 (hard-coded currently) * max size option. So using defaults, + buckets will be is 4 * 513kb (the biggest default value) = 2052kb. A bucket of 2052kb at offset + zero will serve out bucket 'blocks' of 5kb, the next bucket will do the next size up and so on + up to the maximum (default) of 513kb). + + <p>When we write blocks to the bucketcache, we will see which bucket size group it best fits. + So a 4 KB block size goes to the 5 KB size group. Each of the block writes, writes within its + appropriate bucket. Though the bucket is '4kb' in size, it will occupy one of the + 5 KB bucket 'blocks' (even if actual size of the bucket is less). Bucket 'blocks' will not span + buckets. + + <p>But you can see the physical memory under the bucket 'blocks' can be split across the + underlying backing BBs from ByteBufferArray. All is split into 4 MB sized BBs. + + <p>Each Bucket knows its offset in the entire space of BC and when block is written the offset + arrives at ByteBufferArray and it figures which BB to write to. It may so happen that the entire + block to be written does not fit a particular backing ByteBufferArray so the remainder goes to + another BB. See <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html#putMultiple(long,%20int,%20byte[])"><code>ByteBufferArray.putMultiple(long, int, byte[])</code></a>. + +So said all these, when we read a block it may be possible that the bytes of that blocks is physically placed in 2 adjucent BBs. In such case also, we avoid any copy need by having the MBB...</div> </li> </ul> </div> @@ -243,7 +274,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>bufferArray</h4> -<pre>private <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util">ByteBufferArray</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.38">bufferArray</a></pre> +<pre>private <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util">ByteBufferArray</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.69">bufferArray</a></pre> </li> </ul> <a name="capacity"> @@ -252,7 +283,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>capacity</h4> -<pre>private final long <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.39">capacity</a></pre> +<pre>private final long <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.70">capacity</a></pre> </li> </ul> <a name="direct"> @@ -261,7 +292,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockListLast"> <li class="blockList"> <h4>direct</h4> -<pre>private final boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.40">direct</a></pre> +<pre>private final boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.71">direct</a></pre> </li> </ul> </li> @@ -278,7 +309,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockListLast"> <li class="blockList"> <h4>ByteBufferIOEngine</h4> -<pre>public <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.48">ByteBufferIOEngine</a>(long capacity, +<pre>public <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.79">ByteBufferIOEngine</a>(long capacity, boolean direct) throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true"; title="class or interface in java.io">IOException</a></pre> <div class="block">Construct the ByteBufferIOEngine with the given capacity</div> @@ -301,7 +332,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>toString</h4> -<pre>public <a href="http://docs.oracle.com/javase/7/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/io/hfile/bucket/ByteBufferIOEngine.html#line.67">toString</a>()</pre> +<pre>public <a href="http://docs.oracle.com/javase/7/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/io/hfile/bucket/ByteBufferIOEngine.html#line.98">toString</a>()</pre> <dl> <dt><strong>Overrides:</strong></dt> <dd><code><a href="http://docs.oracle.com/javase/7/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="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true"; title="class or interface in java.lang">Object</a></code></dd> @@ -314,7 +345,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>isPersistent</h4> -<pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.78">isPersistent</a>()</pre> +<pre>public boolean <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.109">isPersistent</a>()</pre> <div class="block">Memory IO engine is always unable to support persistent storage for the cache</div> <dl> @@ -329,7 +360,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>read</h4> -<pre>public <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.83">read</a>(long offset, +<pre>public <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a> <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.114">read</a>(long offset, int length, <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/CacheableDeserializer.html" title="interface in org.apache.hadoop.hbase.io.hfile">CacheableDeserializer</a><<a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/Cacheable.html" title="interface in org.apache.hadoop.hbase.io.hfile">Cacheable</a>> deserializer) throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true"; title="class or interface in java.io">IOException</a></pre> @@ -350,7 +381,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>write</h4> -<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.103">write</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true"; title="class or interface in java.nio">ByteBuffer</a> srcBuffer, +<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.134">write</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true"; title="class or interface in java.nio">ByteBuffer</a> srcBuffer, long offset) throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true"; title="class or interface in java.io">IOException</a></pre> <div class="block">Transfers data from the given byte buffer to the buffer array</div> @@ -369,7 +400,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>write</h4> -<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.110">write</a>(<a href="../../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> srcBuffer, +<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.141">write</a>(<a href="../../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> srcBuffer, long offset) throws <a href="http://docs.oracle.com/javase/7/docs/api/java/io/IOException.html?is-external=true"; title="class or interface in java.io">IOException</a></pre> <div class="block"><strong>Description copied from interface: <code><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/IOEngine.html#write(org.apache.hadoop.hbase.nio.ByteBuff,%20long)">IOEngine</a></code></strong></div> @@ -388,7 +419,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockList"> <li class="blockList"> <h4>sync</h4> -<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.121">sync</a>()</pre> +<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.152">sync</a>()</pre> <div class="block">No operation for the sync in the memory IO engine</div> <dl> <dt><strong>Specified by:</strong></dt> @@ -402,7 +433,7 @@ implements <a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket <ul class="blockListLast"> <li class="blockList"> <h4>shutdown</h4> -<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.129">shutdown</a>()</pre> +<pre>public void <a href="../../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html#line.160">shutdown</a>()</pre> <div class="block">No operation for the shutdown in the memory IO engine</div> <dl> <dt><strong>Specified by:</strong></dt> http://git-wip-us.apache.org/repos/asf/hbase-site/blob/123539c5/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/class-use/IOEngine.html ---------------------------------------------------------------------- diff --git a/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/class-use/IOEngine.html b/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/class-use/IOEngine.html index 1c2826a..6c4faad 100644 --- a/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/class-use/IOEngine.html +++ b/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/class-use/IOEngine.html @@ -101,7 +101,7 @@ <td class="colFirst"><code>class </code></td> <td class="colLast"><code><strong><a href="../../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">ByteBufferIOEngine</a></strong></code> <div class="block">IO engine that stores data in memory using an array of ByteBuffers - <a href="../../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a></div> + <a href="../../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a>.</div> </td> </tr> <tr class="rowColor"> http://git-wip-us.apache.org/repos/asf/hbase-site/blob/123539c5/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/package-summary.html ---------------------------------------------------------------------- diff --git a/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/package-summary.html b/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/package-summary.html index 6e55d81..fd16118 100644 --- a/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/package-summary.html +++ b/devapidocs/org/apache/hadoop/hbase/io/hfile/bucket/package-summary.html @@ -146,7 +146,7 @@ <td class="colFirst"><a href="../../../../../../../org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html" title="class in org.apache.hadoop.hbase.io.hfile.bucket">ByteBufferIOEngine</a></td> <td class="colLast"> <div class="block">IO engine that stores data in memory using an array of ByteBuffers - <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a></div> + <a href="../../../../../../../org/apache/hadoop/hbase/util/ByteBufferArray.html" title="class in org.apache.hadoop.hbase.util"><code>ByteBufferArray</code></a>.</div> </td> </tr> <tr class="altColor">
