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| <div class="unit four-fifths"> |
| <article> |
| <h1>ACID support</h1> |
| <p>Historically, the only way to atomically add data to a table in Hive |
| was to add a new partition. Updating or deleting data in partition |
| required removing the old partition and adding it back with the new |
| data and it wasn’t possible to do atomically.</p> |
| |
| <p>However, user’s data is continually changing and as Hive matured, |
| users required reliability guarantees despite the churning data |
| lake. Thus, we needed to implement ACID transactions that guarantee |
| atomicity, consistency, isolation, and durability. Although we support |
| ACID transactions, they are not designed to support OLTP requirements. |
| It can support millions of rows updated per a transaction, but it can |
| not support millions of transactions an hour.</p> |
| |
| <p>Additionally, we wanted to support streaming ingest in to Hive tables where |
| streaming applications like Flume or Storm could write data into Hive and |
| have transactions commit once a minute and queries would either see all of |
| a transaction or none of it.</p> |
| |
| <p>HDFS is a write once file system and ORC is a write-once file format, so edits |
| were implemented using base files and delta files where insert, update, and |
| delete operations are recorded.</p> |
| |
| <p>Hive tables without ACID enabled have each partition in HDFS look like:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Filename</th> |
| <th style="text-align: left">Contents</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">00000_0</td> |
| <td style="text-align: left">Bucket 0</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">00001_0</td> |
| <td style="text-align: left">Bucket 1</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p>With ACID enabled, the system will add delta directories:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Filename</th> |
| <th style="text-align: left">Contents</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">00000_0</td> |
| <td style="text-align: left">Bucket 0 base</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">00001_0</td> |
| <td style="text-align: left">Bucket 1 base</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">delta_0000005_0000005/bucket_00000</td> |
| <td style="text-align: left">Transaction 5 to 5, bucket 0 delta</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">delta_0000005_0000005/bucket_00001</td> |
| <td style="text-align: left">Transaction 5 to 5, bucket 1 delta</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p>When too many deltas have been created, a minor compaction will automatically |
| run and merge a set of transactions into a single delta:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Filename</th> |
| <th style="text-align: left">Contents</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">00000_0</td> |
| <td style="text-align: left">Bucket 0 base</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">00001_0</td> |
| <td style="text-align: left">Bucket 1 base</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">delta_0000005_0000010/bucket_00000</td> |
| <td style="text-align: left">Transaction 5 to 10, bucket 0 delta</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">delta_0000005_0000010/bucket_00001</td> |
| <td style="text-align: left">Transaction 5 to 10, bucket 1 delta</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p>When the deltas get large enough, major compaction will re-write the base |
| to incorporate the deltas.</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Filename</th> |
| <th style="text-align: left">Contents</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">base_0000010/bucket_00000</td> |
| <td style="text-align: left">Transactions upto 10, bucket 0 base</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">base_0000010/bucket_00001</td> |
| <td style="text-align: left">Transactions upto 10, bucket 1 base</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p>Reads and compactions do not require locks and thus compactions can |
| not destructively modify their inputs, but rather write new |
| directories.</p> |
| |
| <p>All rows are given an automatic assigned row id, which is the triple of |
| original transaction id, bucket, and row id, that is guaranteed to be unique. |
| All update and delete operations refer to that triple.</p> |
| |
| <p>The ORC files in an ACID table are extended with several column. They |
| are the operation (insert, update, or delete), the triple that |
| uniquely identifies the row (originalTransaction, bucket, rowId), and |
| the current transaction.</p> |
| |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>struct< |
| operation: int, |
| originalTransaction: bigInt, |
| bucket: int, |
| rowId: bigInt, |
| currentTransaction: bigInt, |
| row: struct<...> |
| > |
| </code></pre></div></div> |
| |
| <p>The serialization for the operation codes is:</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Operation</th> |
| <th style="text-align: left">Serialization</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">INSERT</td> |
| <td style="text-align: left">0</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">UPDATE</td> |
| <td style="text-align: left">1</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">DELETE</td> |
| <td style="text-align: left">2</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <p>When a application or query reads the ACID table, the reader provides |
| the list of committed transactions to include. This list is produced |
| by the Hive metastore when a query starts. The task does a merge |
| sort. Each of the files is sorted by (originalTransaction ascending, |
| bucket ascending, rowId ascending, and currentTransaction |
| descending). Only the first record with a currentTransaction that is |
| in the list of transactions to read is returned, which corresponds to |
| the last visible update to a row.</p> |
| |
| <p>To support streaming ingest, we add two additional features. ORC files |
| may have additional footers written in to their body that is parsable |
| as a complete ORC file that only includes the records already |
| written. As the file is later extended the preliminary file footer |
| becomes dead space within the file. Secondly, a side file named |
| “*_flush_length” is a small file that contains a set of 8 byte |
| values. The last complete 8 byte value is the end of the last |
| preliminary footer.</p> |
| |
| <p>Two properties are added to the metadata for ORC files to speed up the |
| processing of the ACID tables. In particular, when a task is reading |
| part of the base file for a bucket, it will use the first and last |
| rowIds to find the corresponding spots in the delta files. The |
| hive.acid.key.index lets the reader skip over stripes in the delta |
| file that don’t need to be read in this task.</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left">Key</th> |
| <th style="text-align: left">Meaning</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left">hive.acid.stats</td> |
| <td style="text-align: left">Number of inserts, updates, and deletes comma separated</td> |
| </tr> |
| <tr> |
| <td style="text-align: left">hive.acid.key.index</td> |
| <td style="text-align: left">The last originalTransaction, bucket, rowId for each stripe</td> |
| </tr> |
| </tbody> |
| </table> |
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| </article> |
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| <div class="unit one-fifth hide-on-mobiles"> |
| <aside> |
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| <h4>Overview</h4> |
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| <ul> |
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| <li class=""><a href="/docs/index.html">Background</a></li> |
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| <li class=""><a href="/docs/adopters.html">ORC Adopters</a></li> |
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| <li class=""><a href="/docs/indexes.html">Indexes</a></li> |
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| <li class="current"><a href="/docs/acid.html">ACID support</a></li> |
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| </ul> |
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| <h4>Installing</h4> |
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| <li class=""><a href="/docs/building.html">Building ORC</a></li> |
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| <h4>Using in Spark</h4> |
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| <li class=""><a href="/docs/spark-ddl.html">Spark DDL</a></li> |
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| <li class=""><a href="/docs/spark-config.html">Spark Configuration</a></li> |
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| </ul> |
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| <h4>Using in Python</h4> |
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| <li class=""><a href="/docs/pyarrow.html">PyArrow</a></li> |
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| <li class=""><a href="/docs/dask.html">Dask</a></li> |
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| </ul> |
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| <h4>Using in Hive</h4> |
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| <li class=""><a href="/docs/hive-ddl.html">Hive DDL</a></li> |
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| <li class=""><a href="/docs/hive-config.html">Hive Configuration</a></li> |
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| </ul> |
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| <h4>Using in MapReduce</h4> |
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| <ul> |
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| <li class=""><a href="/docs/mapred.html">Using in MapRed</a></li> |
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| <li class=""><a href="/docs/mapreduce.html">Using in MapReduce</a></li> |
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| </ul> |
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| <h4>Using ORC Core</h4> |
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| <li class=""><a href="/docs/core-java.html">Using Core Java</a></li> |
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| <li class=""><a href="/docs/core-cpp.html">Using Core C++</a></li> |
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| <li class=""><a href="/docs/core-java-config.html">ORC Java configuration</a></li> |
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| </ul> |
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| <h4>Tools</h4> |
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| <ul> |
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| <li class=""><a href="/docs/cpp-tools.html">C++ Tools</a></li> |
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| <li class=""><a href="/docs/java-tools.html">Java Tools</a></li> |
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| </ul> |
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| </aside> |
| </div> |
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