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| <div class="subTitle">org.apache.hadoop.hbase.io.hfile</div> |
| <h2 title="Class ChecksumUtil" class="title">Class ChecksumUtil</h2> |
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| <li>org.apache.hadoop.hbase.io.hfile.ChecksumUtil</li> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.36">ChecksumUtil</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">Utility methods to compute and validate checksums.</div> |
| </li> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#CHECKSUM_BUF_SIZE">CHECKSUM_BUF_SIZE</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#generateExceptions">generateExceptions</a></span></code> |
| <div class="block">This is used by unit tests to make checksum failures throw an |
| exception instead of returning null.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#LOG">LOG</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#ChecksumUtil--">ChecksumUtil</a></span>()</code> </td> |
| </tr> |
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| <td class="colFirst"><code>(package private) static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#generateChecksums-byte:A-int-int-byte:A-int-org.apache.hadoop.hbase.util.ChecksumType-int-">generateChecksums</a></span>(byte[] indata, |
| int startOffset, |
| int endOffset, |
| byte[] outdata, |
| int outOffset, |
| <a href="../../../../../../org/apache/hadoop/hbase/util/ChecksumType.html" title="enum in org.apache.hadoop.hbase.util">ChecksumType</a> checksumType, |
| int bytesPerChecksum)</code> |
| <div class="block">Generates a checksum for all the data in indata.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#generateExceptionForChecksumFailureForTest-boolean-">generateExceptionForChecksumFailureForTest</a></span>(boolean value)</code> |
| <div class="block">Mechanism to throw an exception in case of hbase checksum |
| failure.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>(package private) static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#numBytes-long-int-">numBytes</a></span>(long datasize, |
| int bytesPerChecksum)</code> |
| <div class="block">Returns the number of bytes needed to store the checksums for |
| a specified data size</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>(package private) static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#numChunks-long-int-">numChunks</a></span>(long datasize, |
| int bytesPerChecksum)</code> |
| <div class="block">Returns the number of checksum chunks needed to store the checksums for |
| a specified data size</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>(package private) static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#validateChecksum-org.apache.hadoop.hbase.nio.ByteBuff-java.lang.String-long-int-">validateChecksum</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> buf, |
| <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> pathName, |
| long offset, |
| int hdrSize)</code> |
| <div class="block">Validates that the data in the specified HFileBlock matches the checksum.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#verifyChunkedSums-org.apache.hadoop.util.DataChecksum-org.apache.hadoop.hbase.nio.ByteBuff-org.apache.hadoop.hbase.nio.ByteBuff-java.lang.String-">verifyChunkedSums</a></span>(org.apache.hadoop.util.DataChecksum dataChecksum, |
| <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> data, |
| <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> checksums, |
| <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> pathName)</code> |
| <div class="block">Like the hadoop's <code>DataChecksum.verifyChunkedSums(ByteBuffer, ByteBuffer, String, long)</code>, |
| this method will also verify checksum of each chunk in data.</div> |
| </td> |
| </tr> |
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| <h3>Field Detail</h3> |
| <a name="LOG"> |
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| <h4>LOG</h4> |
| <pre>public static final org.slf4j.Logger <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.37">LOG</a></pre> |
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| <h4>CHECKSUM_BUF_SIZE</h4> |
| <pre>public static final int <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.39">CHECKSUM_BUF_SIZE</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.io.hfile.ChecksumUtil.CHECKSUM_BUF_SIZE">Constant Field Values</a></dd> |
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| <h4>generateExceptions</h4> |
| <pre>private static boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.48">generateExceptions</a></pre> |
| <div class="block">This is used by unit tests to make checksum failures throw an |
| exception instead of returning null. Returning a null value from |
| checksum validation will cause the higher layer to retry that |
| read with hdfs-level checksums. Instead, we would like checksum |
| failures to cause the entire unit test to fail.</div> |
| </li> |
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| </li> |
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| <h3>Constructor Detail</h3> |
| <a name="ChecksumUtil--"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>ChecksumUtil</h4> |
| <pre>public <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.36">ChecksumUtil</a>()</pre> |
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| <a name="generateChecksums-byte:A-int-int-byte:A-int-org.apache.hadoop.hbase.util.ChecksumType-int-"> |
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| <h4>generateChecksums</h4> |
| <pre>static void <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.64">generateChecksums</a>(byte[] indata, |
| int startOffset, |
| int endOffset, |
| byte[] outdata, |
| int outOffset, |
| <a href="../../../../../../org/apache/hadoop/hbase/util/ChecksumType.html" title="enum in org.apache.hadoop.hbase.util">ChecksumType</a> checksumType, |
| int bytesPerChecksum) |
| 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">Generates a checksum for all the data in indata. The checksum is |
| written to outdata.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>indata</code> - input data stream</dd> |
| <dd><code>startOffset</code> - starting offset in the indata stream from where to |
| compute checkums from</dd> |
| <dd><code>endOffset</code> - ending offset in the indata stream upto |
| which checksums needs to be computed</dd> |
| <dd><code>outdata</code> - the output buffer where checksum values are written</dd> |
| <dd><code>outOffset</code> - the starting offset in the outdata where the |
| checksum values are written</dd> |
| <dd><code>checksumType</code> - type of checksum</dd> |
| <dd><code>bytesPerChecksum</code> - number of bytes per checksum value</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> |
| </dl> |
| </li> |
| </ul> |
| <a name="verifyChunkedSums-org.apache.hadoop.util.DataChecksum-org.apache.hadoop.hbase.nio.ByteBuff-org.apache.hadoop.hbase.nio.ByteBuff-java.lang.String-"> |
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| <h4>verifyChunkedSums</h4> |
| <pre>private static boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.92">verifyChunkedSums</a>(org.apache.hadoop.util.DataChecksum dataChecksum, |
| <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> data, |
| <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> checksums, |
| <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> pathName)</pre> |
| <div class="block">Like the hadoop's <code>DataChecksum.verifyChunkedSums(ByteBuffer, ByteBuffer, String, long)</code>, |
| this method will also verify checksum of each chunk in data. the difference is: this method can |
| accept <a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio"><code>ByteBuff</code></a> as arguments, we can not add it in hadoop-common so defined here.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dataChecksum</code> - to calculate the checksum.</dd> |
| <dd><code>data</code> - as the input</dd> |
| <dd><code>checksums</code> - to compare</dd> |
| <dd><code>pathName</code> - indicate that the data is read from which file.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a flag indicate the checksum match or mismatch.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>DataChecksum.verifyChunkedSums(ByteBuffer, ByteBuffer, String, |
| long)</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="validateChecksum-org.apache.hadoop.hbase.nio.ByteBuff-java.lang.String-long-int-"> |
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| </a> |
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| <h4>validateChecksum</h4> |
| <pre>static boolean <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.171">validateChecksum</a>(<a href="../../../../../../org/apache/hadoop/hbase/nio/ByteBuff.html" title="class in org.apache.hadoop.hbase.nio">ByteBuff</a> buf, |
| <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> pathName, |
| long offset, |
| int hdrSize)</pre> |
| <div class="block">Validates that the data in the specified HFileBlock matches the checksum. Generates the |
| checksums for the data and then validate that it matches those stored in the end of the data.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>buf</code> - Contains the data in following order: HFileBlock header, data, checksums.</dd> |
| <dd><code>pathName</code> - Path of the HFile to which the <code>data</code> belongs. Only used for logging.</dd> |
| <dd><code>offset</code> - offset of the data being validated. Only used for logging.</dd> |
| <dd><code>hdrSize</code> - Size of the block header in <code>data</code>. Only used for logging.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>True if checksum matches, else false.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>numBytes</h4> |
| <pre>static long <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.199">numBytes</a>(long datasize, |
| int bytesPerChecksum)</pre> |
| <div class="block">Returns the number of bytes needed to store the checksums for |
| a specified data size</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datasize</code> - number of bytes of data</dd> |
| <dd><code>bytesPerChecksum</code> - number of bytes in a checksum chunk</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The number of bytes needed to store the checksum values</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="numChunks-long-int-"> |
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| <h4>numChunks</h4> |
| <pre>static long <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.210">numChunks</a>(long datasize, |
| int bytesPerChecksum)</pre> |
| <div class="block">Returns the number of checksum chunks needed to store the checksums for |
| a specified data size</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>datasize</code> - number of bytes of data</dd> |
| <dd><code>bytesPerChecksum</code> - number of bytes in a checksum chunk</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The number of checksum chunks</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="generateExceptionForChecksumFailureForTest-boolean-"> |
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| <h4>generateExceptionForChecksumFailureForTest</h4> |
| <pre>public static void <a href="../../../../../../src-html/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.html#line.224">generateExceptionForChecksumFailureForTest</a>(boolean value)</pre> |
| <div class="block">Mechanism to throw an exception in case of hbase checksum |
| failure. This is used by unit tests only.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>value</code> - Setting this to true will cause hbase checksum |
| verification failures to generate exceptions.</dd> |
| </dl> |
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