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| <div class="subTitle">org.apache.hadoop.hbase.mob.mapreduce</div> |
| <h2 title="Class MobRefReporter" class="title">Class MobRefReporter</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.conf.Configured</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.hbase.mob.mapreduce.MobRefReporter</li> |
| </ul> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd>org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool</dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.164">MobRefReporter</a> |
| extends org.apache.hadoop.conf.Configured |
| implements org.apache.hadoop.util.Tool</pre> |
| <div class="block">Scans a given table + CF for all mob reference cells to get the list of backing mob files. |
| For each referenced file we attempt to verify that said file is on the FileSystem in a place |
| that the MOB system will look when attempting to resolve the actual value. |
| |
| The job includes counters that can help provide a rough sketch of the mob data. |
| |
| <pre> |
| Map-Reduce Framework |
| Map input records=10000 |
| ... |
| Reduce output records=99 |
| ... |
| CELLS PER ROW |
| Number of rows with 1s of cells per row=10000 |
| MOB |
| NUM_CELLS=52364 |
| PROBLEM |
| Affected rows=338 |
| Problem MOB files=2 |
| ROWS WITH PROBLEMS PER FILE |
| Number of HFiles with 100s of affected rows=2 |
| SIZES OF CELLS |
| Number of cells with size in the 10,000s of bytes=627 |
| Number of cells with size in the 100,000s of bytes=51392 |
| Number of cells with size in the 1,000,000s of bytes=345 |
| SIZES OF ROWS |
| Number of rows with total size in the 100,000s of bytes=6838 |
| Number of rows with total size in the 1,000,000s of bytes=3162 |
| </pre> |
| |
| * Map-Reduce Framework:Map input records - the number of rows with mob references |
| * Map-Reduce Framework:Reduce output records - the number of unique hfiles referenced |
| * MOB:NUM_CELLS - the total number of mob reference cells |
| * PROBLEM:Affected rows - the number of rows that reference hfiles with an issue |
| * PROBLEM:Problem MOB files - the number of unique hfiles that have an issue |
| * CELLS PER ROW: - this counter group gives a histogram of the order of magnitude of the |
| number of cells in a given row by grouping by the number of digits used in each count. |
| This allows us to see more about the distribution of cells than what we can determine |
| with just the cell count and the row count. In this particular example we can see that |
| all of our rows have somewhere between 1 - 9 cells. |
| * ROWS WITH PROBLEMS PER FILE: - this counter group gives a histogram of the order of |
| magnitude of the number of rows in each of the hfiles with a problem. e.g. in the |
| example there are 2 hfiles and they each have the same order of magnitude number of rows, |
| specifically between 100 and 999. |
| * SIZES OF CELLS: - this counter group gives a histogram of the order of magnitude of |
| the size of mob values according to our reference cells. e.g. in the example above we |
| have cell sizes that are all between 10,000 bytes and 9,999,999 bytes. From this |
| histogram we can also see that _most_ cells are 100,000 - 999,000 bytes and the smaller |
| and bigger ones are outliers making up less than 2% of mob cells. |
| * SIZES OF ROWS: - this counter group gives a histogram of the order of magnitude of the |
| size of mob values across each row according to our reference cells. In the example above |
| we have rows that are are between 100,000 bytes and 9,999,999 bytes. We can also see that |
| about 2/3rd of our rows are 100,000 - 999,999 bytes. |
| |
| Generates a report that gives one file status per line, with tabs dividing fields. |
| |
| <pre> |
| RESULT OF LOOKUP FILE REF comma seperated, base64 encoded rows when there's a problem |
| </pre> |
| |
| e.g. |
| |
| <pre> |
| MOB DIR 09c576e28a65ed2ead0004d192ffaa382019110184b30a1c7e034573bf8580aef8393402 |
| MISSING FILE 28e252d7f013973174750d483d358fa020191101f73536e7133f4cd3ab1065edf588d509 MmJiMjMyYzBiMTNjNzc0OTY1ZWY4NTU4ZjBmYmQ2MTUtNTIz,MmEzOGE0YTkzMTZjNDllNWE4MzM1MTdjNDVkMzEwNzAtODg= |
| </pre> |
| |
| Possible results are listed; the first three indicate things are working properly. |
| * MOB DIR - the reference is in the normal MOB area for the given table and CF |
| * HLINK TO ARCHIVE FOR SAME TABLE - the reference is present in the archive area for this |
| table and CF |
| * HLINK TO ARCHIVE FOR OTHER TABLE - the reference is present in a different table and CF, |
| either in the MOB or archive areas (e.g. from a snapshot restore or clone) |
| * ARCHIVE WITH HLINK BUT NOT FROM OUR TABLE - the reference is currently present in the archive |
| area for this table and CF, but it is kept there because a _different_ table has a |
| reference to it (e.g. from a snapshot clone). If these other tables are removed then |
| the file will likely be deleted unless there is a snapshot also referencing it. |
| * ARCHIVE BUT NO HLINKS - the reference is currently present in the archive for this table and |
| CF, but there are no references present to prevent its removal. Unless it is newer than |
| the general TTL (default 5 minutes) or referenced in a snapshot it will be subject to |
| cleaning. |
| * ARCHIVE BUT FAILURE WHILE CHECKING HLINKS - Check the job logs to see why things failed while |
| looking for why this file is being kept around. |
| * MISSING FILE - We couldn't find the reference on the FileSystem. Either there is dataloss due |
| to a bug in the MOB storage system or the MOB storage is damaged but in an edge case that |
| allows it to work for now. You can verify which by doing a raw reference scan to get the |
| referenced hfile and check the underlying filesystem. See the ref guide section on mob |
| for details. |
| * HLINK BUT POINT TO MISSING FILE - There is a pointer in our mob area for this table and CF |
| to a file elsewhere on the FileSystem, however the file it points to no longer exists. |
| * MISSING FILE BUT FAILURE WHILE CHECKING HLINKS - We could not find the referenced file, |
| however you should check the job logs to see why we couldn't check to see if there is a |
| pointer to the referenced file in our archive or another table's archive or mob area.</div> |
| </li> |
| </ul> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.MobRefMapper.html" title="class in org.apache.hadoop.hbase.mob.mapreduce">MobRefReporter.MobRefMapper</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.MobRefReducer.html" title="class in org.apache.hadoop.hbase.mob.mapreduce">MobRefReporter.MobRefReducer</a></span></code> </td> |
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| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#LOG">LOG</a></span></code> </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/hbase/mob/mapreduce/MobRefReporter.html#NAME">NAME</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>(package private) 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/hbase/mob/mapreduce/MobRefReporter.html#REPORT_JOB_ID">REPORT_JOB_ID</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>(package private) 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/hbase/mob/mapreduce/MobRefReporter.html#REPORT_START_DATETIME">REPORT_START_DATETIME</a></span></code> </td> |
| </tr> |
| </table> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#MobRefReporter--">MobRefReporter</a></span>()</code> </td> |
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| <td class="colFirst"><code>(package private) 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/hbase/mob/mapreduce/MobRefReporter.html#log10GroupedString-long-">log10GroupedString</a></span>(long number)</code> |
| <div class="block">Returns the string representation of the given number after grouping it |
| into log10 buckets.</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/mob/mapreduce/MobRefReporter.html#main-java.lang.String:A-">main</a></span>(<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>[] args)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#printUsage--">printUsage</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#run-java.lang.String:A-">run</a></span>(<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>[] args)</code> |
| <div class="block">Main method for the tool.</div> |
| </td> |
| </tr> |
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| <h3>Methods inherited from class org.apache.hadoop.conf.Configured</h3> |
| <code>getConf, setConf</code></li> |
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| </a> |
| <h3>Methods inherited from interface org.apache.hadoop.conf.Configurable</h3> |
| <code>getConf, setConf</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
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| <h3>Field Detail</h3> |
| <a name="LOG"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>LOG</h4> |
| <pre>private static org.slf4j.Logger <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.165">LOG</a></pre> |
| </li> |
| </ul> |
| <a name="NAME"> |
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| </a> |
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| <h4>NAME</h4> |
| <pre>public static final <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> <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.166">NAME</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.mob.mapreduce.MobRefReporter.NAME">Constant Field Values</a></dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>REPORT_JOB_ID</h4> |
| <pre>static final <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> <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.167">REPORT_JOB_ID</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.mob.mapreduce.MobRefReporter.REPORT_JOB_ID">Constant Field Values</a></dd> |
| </dl> |
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| <a name="REPORT_START_DATETIME"> |
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| </a> |
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| <h4>REPORT_START_DATETIME</h4> |
| <pre>static final <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> <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.168">REPORT_START_DATETIME</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.mob.mapreduce.MobRefReporter.REPORT_START_DATETIME">Constant Field Values</a></dd> |
| </dl> |
| </li> |
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| <pre>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> <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.393">log10GroupedString</a>(long number)</pre> |
| <div class="block">Returns the string representation of the given number after grouping it |
| into log10 buckets. e.g. 0-9 -> 1, 10-99 -> 10, ..., 100,000-999,999 -> 100,000, etc.</div> |
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| <h4>run</h4> |
| <pre>public int <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.402">run</a>(<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>[] args) |
| 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>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Main method for the tool.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>run</code> in interface <code>org.apache.hadoop.util.Tool</code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>0 if success, 1 for bad args. 2 if job aborted with an exception, |
| 3 if mr job was unsuccessful</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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| <pre>public static void <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.493">main</a>(<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>[] args) |
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| <pre>private void <a href="../../../../../../src-html/org/apache/hadoop/hbase/mob/mapreduce/MobRefReporter.html#line.499">printUsage</a>()</pre> |
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