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| <h1 class="title">Migration Guide: Spark Core</h1> |
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| <ul id="markdown-toc"> |
| <li><a href="#upgrading-from-core-31-to-32" id="markdown-toc-upgrading-from-core-31-to-32">Upgrading from Core 3.1 to 3.2</a></li> |
| <li><a href="#upgrading-from-core-30-to-31" id="markdown-toc-upgrading-from-core-30-to-31">Upgrading from Core 3.0 to 3.1</a></li> |
| <li><a href="#upgrading-from-core-24-to-30" id="markdown-toc-upgrading-from-core-24-to-30">Upgrading from Core 2.4 to 3.0</a></li> |
| </ul> |
| |
| <h2 id="upgrading-from-core-31-to-32">Upgrading from Core 3.1 to 3.2</h2> |
| |
| <ul> |
| <li> |
| <p>Since Spark 3.2, <code class="language-plaintext highlighter-rouge">spark.scheduler.allocation.file</code> supports read remote file using hadoop filesystem which means if the path has no scheme Spark will respect hadoop configuration to read it. To restore the behavior before Spark 3.2, you can specify the local scheme for <code class="language-plaintext highlighter-rouge">spark.scheduler.allocation.file</code> e.g. <code class="language-plaintext highlighter-rouge">file:///path/to/file</code>.</p> |
| </li> |
| <li> |
| <p>Since Spark 3.2, <code class="language-plaintext highlighter-rouge">spark.hadoopRDD.ignoreEmptySplits</code> is set to <code class="language-plaintext highlighter-rouge">true</code> by default which means Spark will not create empty partitions for empty input splits. To restore the behavior before Spark 3.2, you can set <code class="language-plaintext highlighter-rouge">spark.hadoopRDD.ignoreEmptySplits</code> to <code class="language-plaintext highlighter-rouge">false</code>.</p> |
| </li> |
| <li> |
| <p>Since Spark 3.2, <code class="language-plaintext highlighter-rouge">spark.eventLog.compression.codec</code> is set to <code class="language-plaintext highlighter-rouge">zstd</code> by default which means Spark will not fallback to use <code class="language-plaintext highlighter-rouge">spark.io.compression.codec</code> anymore.</p> |
| </li> |
| <li> |
| <p>Since Spark 3.2, <code class="language-plaintext highlighter-rouge">spark.storage.replication.proactive</code> is enabled by default which means Spark tries to replenish in case of the loss of cached RDD block replicas due to executor failures. To restore the behavior before Spark 3.2, you can set <code class="language-plaintext highlighter-rouge">spark.storage.replication.proactive</code> to <code class="language-plaintext highlighter-rouge">false</code>.</p> |
| </li> |
| <li> |
| <p>In Spark 3.2, <code class="language-plaintext highlighter-rouge">spark.launcher.childConectionTimeout</code> is deprecated (typo) though still works. Use <code class="language-plaintext highlighter-rouge">spark.launcher.childConnectionTimeout</code> instead.</p> |
| </li> |
| <li> |
| <p>In Spark 3.2, support for Apache Mesos as a resource manager is deprecated and will be removed in a future version.</p> |
| </li> |
| <li> |
| <p>In Spark 3.2, Spark will delete K8s driver service resource when the application terminates by itself. To restore the behavior before Spark 3.2, you can set <code class="language-plaintext highlighter-rouge">spark.kubernetes.driver.service.deleteOnTermination</code> to <code class="language-plaintext highlighter-rouge">false</code>.</p> |
| </li> |
| </ul> |
| |
| <h2 id="upgrading-from-core-30-to-31">Upgrading from Core 3.0 to 3.1</h2> |
| |
| <ul> |
| <li> |
| <p>In Spark 3.0 and below, <code class="language-plaintext highlighter-rouge">SparkContext</code> can be created in executors. Since Spark 3.1, an exception will be thrown when creating <code class="language-plaintext highlighter-rouge">SparkContext</code> in executors. You can allow it by setting the configuration <code class="language-plaintext highlighter-rouge">spark.executor.allowSparkContext</code> when creating <code class="language-plaintext highlighter-rouge">SparkContext</code> in executors.</p> |
| </li> |
| <li> |
| <p>In Spark 3.0 and below, Spark propagated the Hadoop classpath from <code class="language-plaintext highlighter-rouge">yarn.application.classpath</code> and <code class="language-plaintext highlighter-rouge">mapreduce.application.classpath</code> into the Spark application submitted to YARN when Spark distribution is with the built-in Hadoop. Since Spark 3.1, it does not propagate anymore when the Spark distribution is with the built-in Hadoop in order to prevent the failure from the different transitive dependencies picked up from the Hadoop cluster such as Guava and Jackson. To restore the behavior before Spark 3.1, you can set <code class="language-plaintext highlighter-rouge">spark.yarn.populateHadoopClasspath</code> to <code class="language-plaintext highlighter-rouge">true</code>.</p> |
| </li> |
| </ul> |
| |
| <h2 id="upgrading-from-core-24-to-30">Upgrading from Core 2.4 to 3.0</h2> |
| |
| <ul> |
| <li> |
| <p>The <code class="language-plaintext highlighter-rouge">org.apache.spark.ExecutorPlugin</code> interface and related configuration has been replaced with |
| <code class="language-plaintext highlighter-rouge">org.apache.spark.api.plugin.SparkPlugin</code>, which adds new functionality. Plugins using the old |
| interface must be modified to extend the new interfaces. Check the |
| <a href="monitoring.html">Monitoring</a> guide for more details.</p> |
| </li> |
| <li> |
| <p>Deprecated method <code class="language-plaintext highlighter-rouge">TaskContext.isRunningLocally</code> has been removed. Local execution was removed and it always has returned <code class="language-plaintext highlighter-rouge">false</code>.</p> |
| </li> |
| <li> |
| <p>Deprecated method <code class="language-plaintext highlighter-rouge">shuffleBytesWritten</code>, <code class="language-plaintext highlighter-rouge">shuffleWriteTime</code> and <code class="language-plaintext highlighter-rouge">shuffleRecordsWritten</code> in <code class="language-plaintext highlighter-rouge">ShuffleWriteMetrics</code> have been removed. Instead, use <code class="language-plaintext highlighter-rouge">bytesWritten</code>, <code class="language-plaintext highlighter-rouge">writeTime </code> and <code class="language-plaintext highlighter-rouge">recordsWritten</code> respectively.</p> |
| </li> |
| <li> |
| <p>Deprecated method <code class="language-plaintext highlighter-rouge">AccumulableInfo.apply</code> have been removed because creating <code class="language-plaintext highlighter-rouge">AccumulableInfo</code> is disallowed.</p> |
| </li> |
| <li> |
| <p>Deprecated accumulator v1 APIs have been removed and please use v2 APIs instead.</p> |
| </li> |
| <li> |
| <p>Event log file will be written as UTF-8 encoding, and Spark History Server will replay event log files as UTF-8 encoding. Previously Spark wrote the event log file as default charset of driver JVM process, so Spark History Server of Spark 2.x is needed to read the old event log files in case of incompatible encoding.</p> |
| </li> |
| <li> |
| <p>A new protocol for fetching shuffle blocks is used. It’s recommended that external shuffle services be upgraded when running Spark 3.0 apps. You can still use old external shuffle services by setting the configuration <code class="language-plaintext highlighter-rouge">spark.shuffle.useOldFetchProtocol</code> to <code class="language-plaintext highlighter-rouge">true</code>. Otherwise, Spark may run into errors with messages like <code class="language-plaintext highlighter-rouge">IllegalArgumentException: Unexpected message type: <number></code>.</p> |
| </li> |
| <li> |
| <p><code class="language-plaintext highlighter-rouge">SPARK_WORKER_INSTANCES</code> is deprecated in Standalone mode. It’s recommended to launch multiple executors in one worker and launch one worker per node instead of launching multiple workers per node and launching one executor per worker.</p> |
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