Question

我想做什么： 保存Mllib模型

我在Spark中运行的代码：

model = RandomForest.trainClassifier(train_data, 
                                 numClasses=2, categoricalFeaturesInfo=categoricalFeaturesInfo,
                                 numTrees=numTrees, featureSubsetStrategy="auto",
                                 impurity=impurity, maxDepth=maxDepth, maxBins=maxBins)

model.save(sc, "file:///path/to/models/model_name")

错误消息为：

本机snappy库不可用：此版本的libhadoop是在没有snappy支持的情况下构建的

Spark的信息

Spark版本： 1.6.1

启动Spark的代码：

pyspark --packages com.databricks:spark-csv_2.11:1.5.0 --master "local[8]" --driver-memory 6G --executor-memory 6G --jars /usr/local/path/to/hadoop/lib/snappy-java-1.0.4.1.jar

环境变量（spark_env.sh）：

HADOOP_HOME=/usr/local/path/to/hadoop 
SPARK_HOME=/usr/local/path/to/spark
HADOOP_CONF_DIR=/usr/local/path/to/hadoop/etc/hadoop
SPARK_CONF_DIR=/usr/local/path/to/spark/conf
HADOOP_LZO_DIR=/usr/local/path/to/hadoop/lib
HADOOP_CLASSPATH=$HADOOP_CLASSPATH:/usr/local/path/to/spark/*:/usr/local/path/to/spark/lib/*:/usr/local/path/to/hadoop/lib/*:/usr/local/path/to/hadoop/lib/native/*
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/path/to/hadoop/lib/native
SPARK_CLASSPATH=$SPARK_CLASSPATH:/usr/local/path/to/hadoop/lib/native/*:/usr/local/path/to/hadoop/lib/snappy-java-1.0.4.1.jar:/usr.local/path/to/spark/lib/*:$CLASSPATH

我有意在SPARK_CLASSPATH中添加/usr/local/path/to/hadoop/lib/snappy-java-1.0.4.1.jar但无济于事。

Answer 1

接下来的步骤帮助我解决了类似的问题：

从https://hadoop.apache.org/releases.html下载hadoop库，在本地解压缩并将spark.driver.extraLibraryPath设置为$HADOOP_PATH/lib/native。

示例：

pyspark --packages com.databricks:spark-csv_2.11:1.5.0 --master "local[8]" --conf "spark.driver.extraLibraryPath=/home/hadoop/hadoop-2.8.1/lib/native" --driver-memory 6G --executor-memory 6G --jars /usr/local/path/to/hadoop/lib/snappy-java-1.0.4.1.jar

如果spark.executor.extraLibraryPath不适合您，可以尝试将id="myModal"设置为相同的值。

Spark - Snappy Libary不可用

Spark的信息

1 个答案: