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| <h2 title="Interface HFile.CachingBlockReader" class="title">Interface HFile.CachingBlockReader</h2> |
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| <pre>public static interface <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFile.html#line.367">HFile.CachingBlockReader</a></pre> |
| <div class="block">An abstraction used by the block index. |
| Implementations will check cache for any asked-for block and return cached block if found. |
| Otherwise, after reading from fs, will try and put block into cache before returning.</div> |
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| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFile.CachingBlockReader.html#readBlock-long-long-boolean-boolean-boolean-boolean-org.apache.hadoop.hbase.io.hfile.BlockType-org.apache.hadoop.hbase.io.encoding.DataBlockEncoding-">readBlock</a></span>(long offset, |
| long onDiskBlockSize, |
| boolean cacheBlock, |
| boolean pread, |
| boolean isCompaction, |
| boolean updateCacheMetrics, |
| <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a> expectedBlockType, |
| <a href="../../../../../../org/apache/hadoop/hbase/io/encoding/DataBlockEncoding.html" title="enum in org.apache.hadoop.hbase.io.encoding">DataBlockEncoding</a> expectedDataBlockEncoding)</code> |
| <div class="block">Read in a file block.</div> |
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| <h4>readBlock</h4> |
| <pre><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/HFileBlock.html" title="class in org.apache.hadoop.hbase.io.hfile">HFileBlock</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/HFile.CachingBlockReader.html#line.382">readBlock</a>(long offset, |
| long onDiskBlockSize, |
| boolean cacheBlock, |
| boolean pread, |
| boolean isCompaction, |
| boolean updateCacheMetrics, |
| <a href="../../../../../../org/apache/hadoop/hbase/io/hfile/BlockType.html" title="enum in org.apache.hadoop.hbase.io.hfile">BlockType</a> expectedBlockType, |
| <a href="../../../../../../org/apache/hadoop/hbase/io/encoding/DataBlockEncoding.html" title="enum in org.apache.hadoop.hbase.io.encoding">DataBlockEncoding</a> expectedDataBlockEncoding) |
| 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">Read in a file block.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>offset</code> - offset to read.</dd> |
| <dd><code>onDiskBlockSize</code> - size of the block</dd> |
| <dd><code>isCompaction</code> - is this block being read as part of a compaction</dd> |
| <dd><code>expectedBlockType</code> - the block type we are expecting to read with this read operation, |
| or null to read whatever block type is available and avoid checking (that might reduce |
| caching efficiency of encoded data blocks)</dd> |
| <dd><code>expectedDataBlockEncoding</code> - the data block encoding the caller is expecting data blocks |
| to be in, or null to not perform this check and return the block irrespective of the |
| encoding. This check only applies to data blocks and can be set to null when the caller is |
| expecting to read a non-data block and has set expectedBlockType accordingly.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Block wrapped in a ByteBuffer.</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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