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133 lines
5.4 KiB
Markdown
133 lines
5.4 KiB
Markdown
# Hadoop/YARN User Guide
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Hadoop version: Apache Hadoop >= 2.7 (3.X included) or [CDH](https://www.cloudera.com/products/open-source/apache-hadoop/key-cdh-components.html) 5.X. CDH 6.X have not been tested and thus currently not supported.
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---
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For scala user, please see [scala user guide](./scala.md) for how to run BigDL on hadoop/yarn cluster.
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For python user, you can run BigDL programs on standard Hadoop/YARN clusters without any changes to the cluster(i.e., no need to pre-install BigDL or any Python libraries in the cluster).
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### **1. Prepare python Environment**
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- You need to first use [conda](https://docs.conda.io/projects/conda/en/latest/user-guide/install/) to prepare the Python environment _**on the local client machine**_. Create a conda environment and install all the needed Python libraries in the created conda environment:
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```bash
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conda create -n bigdl python=3.7 # "bigdl" is conda environment name, you can use any name you like.
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conda activate bigdl
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# Use conda or pip to install all the needed Python dependencies in the created conda environment.
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```
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- You need to download and install JDK in the environment, and properly set the environment variable `JAVA_HOME`, which is required by Spark. __JDK8__ is highly recommended.
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You may take the following commands as a reference for installing [OpenJDK](https://openjdk.java.net/install/):
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```bash
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# For Ubuntu
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sudo apt-get install openjdk-8-jre
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export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64/
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# For CentOS
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su -c "yum install java-1.8.0-openjdk"
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export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.282.b08-1.el7_9.x86_64/jre
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export PATH=$PATH:$JAVA_HOME/bin
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java -version # Verify the version of JDK.
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```
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- Check the Hadoop setup and configurations of your cluster. Make sure you properly set the environment variable `HADOOP_CONF_DIR`, which is needed to initialize Spark on YARN:
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```bash
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export HADOOP_CONF_DIR=the directory of the hadoop and yarn configurations
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```
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- **For CDH users**
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If you are using BigDL with pip and your CDH cluster has already installed Spark, the CDH's spark will have conflict with the pyspark installed by pip required by bigdl in next section.
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Thus before running bigdl applications, you should unset all the spark related environment variables. You can use `env | grep SPARK` to find all the existing spark environment variables.
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Also, CDH cluster's `HADOOP_CONF_DIR` should be `/etc/hadoop/conf` on CDH by default.
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---
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### **2. YARN Client Mode**
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- Install BigDL components in the created conda environment via pip, like dllib and orca:
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```bash
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pip install bigdl-dllib
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pip install bigdl-orca
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```
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View the [Python User Guide](./python.md) for more details.
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- We recommend using `init_orca_context` at the very beginning of your code to initiate and run BigDL on standard Hadoop/YARN clusters in [YARN client mode](https://spark.apache.org/docs/latest/running-on-yarn.html#launching-spark-on-yarn):
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```python
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from bigdl.orca import init_orca_context
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sc = init_orca_context(cluster_mode="yarn-client", cores=4, memory="10g", num_nodes=2)
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```
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By specifying cluster_mode to be "yarn-client", `init_orca_context` would automatically prepare the runtime Python environment, detect the current Hadoop configurations from `HADOOP_CONF_DIR` and initiate the distributed execution engine on the underlying YARN cluster. View [Orca Context](../Orca/Overview/orca-context.md) for more details.
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- You can then simply run your BigDL program in a Jupyter notebook:
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```bash
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jupyter notebook --notebook-dir=./ --ip=* --no-browser
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```
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or as a normal Python script (e.g. script.py):
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```bash
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python script.py
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```
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---
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### **3. YARN Cluster Mode**
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Follow the steps below if you need to run BigDL in [YARN cluster mode](https://spark.apache.org/docs/latest/running-on-yarn.html#launching-spark-on-yarn).
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- Download and extract [Spark](https://spark.apache.org/downloads.html). You are recommended to use [Spark 2.4.6](https://archive.apache.org/dist/spark/spark-2.4.6/spark-2.4.6-bin-hadoop2.7.tgz). Set the environment variable `SPARK_HOME`:
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```bash
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export SPARK_HOME=the root directory where you extract the downloaded Spark package
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```
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- Download and extract [BigDL](../release.md). Make sure the BigDL package you download is built with the compatible version with your Spark. Set the environment variable `BIGDL_HOME`:
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```bash
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export BIGDL_HOME=the root directory where you extract the downloaded BigDL package
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```
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- Pack the current conda environment to `environment.tar.gz` (you can use any name you like):
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```bash
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conda pack -o environment.tar.gz
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```
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- _You need to write your BigDL program as a Python script._ In the script, you can call `init_orca_context` and specify cluster_mode to be "spark-submit":
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```python
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from bigdl.orca import init_orca_context
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sc = init_orca_context(cluster_mode="spark-submit")
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```
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- Use `spark-submit` to submit your BigDL program (e.g. script.py):
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```bash
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PYSPARK_PYTHON=./environment/bin/python ${BIGDL_HOME}/bin/spark-submit-python-with-bigdl.sh \
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--conf spark.yarn.appMasterEnv.PYSPARK_PYTHON=./environment/bin/python \
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--master yarn-cluster \
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--executor-memory 10g \
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--driver-memory 10g \
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--executor-cores 8 \
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--num-executors 2 \
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--archives environment.tar.gz#environment \
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script.py
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```
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You can adjust the configurations according to your cluster settings.
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