2)export MAVEN_OPTS="-Xmx2g -XX:ReservedCodeCacheSize=512m" 1. 2. mvn编译命令: ./build/mvn -Pyarn -Phadoop-2.4 -Dhadoop.version=2.4.0 -DskipTests clean package [hadoop@hadoop001 spark-2.1.0]$ cat pom.xml [hadoop@hadoop001 spark-2.1.0]$ pwd /home/hadoop/source/spa...
spark.sql.adaptive.enabled TRUE When true, enable adaptive query execution. spark.sql.adaptive.shuffle.targetPostShuffleInputSize 67108864b The target post-shuffle input size in bytes of a task. spark.sql.autoBroadcastJoinThreshold 209715200 Configures the maximum size in bytes for a table that will...
Spark SQL 取代 Spark Core,成为新一代的引擎内核,所有其他子框架如 Mllib、Streaming 和 Graph,都可以共享 Spark SQL 的性能优化,都能从 Spark 社区对于 Spark SQL 的投入中受益。 要优化SparkSQL应用时,一定是要了解SparkSQL执行计划的。发现SQL执行慢的根本原因,才能知道应该在哪儿进行优化,是调整SQL的编写方式...
spark.sql.defaultSizeInBytes (internal) Estimated size of a table or relation used in query planning Default: Java’s Long.MaxValue Set to Java’s Long.MaxValue which is larger than spark.sql.autoBroadcastJoinThreshold to be more conservative. That is to say by default the optimizer will no...
[转] Spark sql 内置配置(V2.2) 【From】 https://blog.csdn.net/u010990043/article/details/82842995 最近整理了一下spark SQL内置配。加粗配置项是对sparkSQL 调优性能影响比较大的项,小伙伴们按需酌情配置。后续会挑出一些通用调优配置,共大家参考。有不正确的地方,欢迎大家在留言区留言讨论。
size - Optional param specifying the size of the returned list. By default it is 20 and that is the maximum. detailed - Optional query param specifying whether detailed response is returned beyond plain livy. Returns: the response.getSparkStatement public Mono getSparkStatement(int sessionId,...
hadoop-env.HADOOP_HEAPSIZE_MAX Default maximum heap size of all Hadoop JVM processes. int 2048 yarn-env.YARN_RESOURCEMANAGER_HEAPSIZE Heap size of Yarn ResourceManager. int 2048 yarn-env.YARN_NODEMANAGER_HEAPSIZE Heap size of Yarn NodeManager. int 2048 mapred-env.HADOOP_JOB_HISTORYSERVER_HEAPSIZ...
size - Optional param specifying the size of the returned list. By default it is 20 and that is the maximum. detailed - Optional query param specifying whether detailed response is returned beyond plain livy. Returns: the response.getSparkStatement public Mono getSparkStatement(int ses...
.load()//Can also load data from a Redshift queryvaldf:DataFrame=sqlContext.read .format("io.github.spark_redshift_community.spark.redshift") .option("url","jdbc:redshift://redshifthost:5439/database?user=username&password=pass")
spark.sql.adaptive.enabled && spark.sql.adaptive.shuffle.targetPostShuffleInputSize 该参数是用于开启spark的自适应执行,这是spark比较老版本的自适应执行,后面的targetPostShuffleInputSize是用于控制之后的shuffle 阶段的平均输入数据大小,防止产生过多的task。