问题
I have a Jupyter notebook on DataProc and I need a jar to run some job. I'm aware of editting spark-defaults.conf and using the --jars=gs://spark-lib/bigquery/spark-bigquery-latest.jar to submit the job from command line - they both work well. However, if I want to directly add jar to jupyter notebook, I tried the methods below and they all fail.
Method 1:
import os
os.environ['PYSPARK_SUBMIT_ARGS'] = '--jars gs://spark-lib/bigquery/spark-bigquery-latest.jar pyspark-shell'
Method 2:
spark = SparkSession.builder.appName('Shakespeare WordCount')\
.config('spark.jars', 'gs://spark-lib/bigquery/spark-bigquery-latest.jar')\
.getOrCreate()
They both have the same error:
---------------------------------------------------------------------------
Py4JJavaError Traceback (most recent call last)
<ipython-input-1-2b7692efb32b> in <module>()
19 # Read BQ data into spark dataframe
20 # This method reads from BQ directly, does not use GCS for intermediate results
---> 21 df = spark.read.format('bigquery').option('table', table).load()
22
23 df.show(5)
/usr/lib/spark/python/pyspark/sql/readwriter.py in load(self, path, format, schema, **options)
170 return self._df(self._jreader.load(self._spark._sc._jvm.PythonUtils.toSeq(path)))
171 else:
--> 172 return self._df(self._jreader.load())
173
174 @since(1.4)
/usr/lib/spark/python/lib/py4j-0.10.7-src.zip/py4j/java_gateway.py in __call__(self, *args)
1255 answer = self.gateway_client.send_command(command)
1256 return_value = get_return_value(
-> 1257 answer, self.gateway_client, self.target_id, self.name)
1258
1259 for temp_arg in temp_args:
/usr/lib/spark/python/pyspark/sql/utils.py in deco(*a, **kw)
61 def deco(*a, **kw):
62 try:
---> 63 return f(*a, **kw)
64 except py4j.protocol.Py4JJavaError as e:
65 s = e.java_exception.toString()
/usr/lib/spark/python/lib/py4j-0.10.7-src.zip/py4j/protocol.py in get_return_value(answer, gateway_client, target_id, name)
326 raise Py4JJavaError(
327 "An error occurred while calling {0}{1}{2}.\n".
--> 328 format(target_id, ".", name), value)
329 else:
330 raise Py4JError(
Py4JJavaError: An error occurred while calling o81.load.
: java.lang.ClassNotFoundException: Failed to find data source: bigquery. Please find packages at http://spark.apache.org/third-party-projects.html
at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSource(DataSource.scala:657)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:194)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:167)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: bigquery.DefaultSource
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$20$$anonfun$apply$12.apply(DataSource.scala:634)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$20$$anonfun$apply$12.apply(DataSource.scala:634)
at scala.util.Try$.apply(Try.scala:192)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$20.apply(DataSource.scala:634)
at org.apache.spark.sql.execution.datasources.DataSource$$anonfun$20.apply(DataSource.scala:634)
at scala.util.Try.orElse(Try.scala:84)
at org.apache.spark.sql.execution.datasources.DataSource$.lookupDataSource(DataSource.scala:634)
... 13 more
The task I try to run is very simple:
table = 'publicdata.samples.shakespeare'
df = spark.read.format('bigquery').option('table', table).load()
df.show(5)
I understand there are many similar questions and answers, but they are either not working or not fitting my needs. There are ad-hoc jars I'll need and I don't want to keep all of them in the default configurations. I'd like to be more flexible and add jars on-the-go. How can I solve this? Thank you!
回答1:
Unfortunately there isn't a built-in way to do this dynamically without effectively just editing spark-defaults.conf and restarting the kernel. There's an open feature request in Spark for this.
Zeppelin has some usability features for adding jars through the UI but even in Zeppelin you have to restart the interpreter after doing so for the Spark context to pick it up in its classloader. And also those options require the jarfiles to already be staged on the local filesystem; you can't just refer to remote file paths or URLs.
One workaround would be to create an init action which sets up a systemd service which regularly polls on some HDFS directory to sync into one of the existing classpath directories like /usr/lib/spark/jars:
#!/bin/bash
# Sets up continuous sync'ing of an HDFS directory into /usr/lib/spark/jars
# Manually copy jars into this HDFS directory to have them sync into
# ${LOCAL_DIR} on all nodes.
HDFS_DROPZONE='hdfs:///usr/lib/jars'
LOCAL_DIR='file:///usr/lib/spark/jars'
readonly ROLE="$(/usr/share/google/get_metadata_value attributes/dataproc-role)"
if [[ "${ROLE}" == 'Master' ]]; then
hdfs dfs -mkdir -p "${HDFS_DROPZONE}"
fi
SYNC_SCRIPT='/usr/lib/hadoop/libexec/periodic-sync-jars.sh'
cat << EOF > "${SYNC_SCRIPT}"
#!/bin/bash
while true; do
sleep 5
hdfs dfs -ls ${HDFS_DROPZONE}/*.jar 2>/dev/null | grep hdfs: | \
sed 's/.*hdfs:/hdfs:/' | xargs -n 1 basename 2>/dev/null | sort \
> /tmp/hdfs_files.txt
hdfs dfs -ls ${LOCAL_DIR}/*.jar 2>/dev/null | grep file: | \
sed 's/.*file:/file:/' | xargs -n 1 basename 2>/dev/null | sort \
> /tmp/local_files.txt
comm -23 /tmp/hdfs_files.txt /tmp/local_files.txt > /tmp/diff_files.txt
if [ -s /tmp/diff_files.txt ]; then
for FILE in \$(cat /tmp/diff_files.txt); do
echo "$(date): Copying \${FILE} from ${HDFS_DROPZONE} into ${LOCAL_DIR}"
hdfs dfs -cp "${HDFS_DROPZONE}/\${FILE}" "${LOCAL_DIR}/\${FILE}"
done
fi
done
EOF
chmod 755 "${SYNC_SCRIPT}"
SERVICE_CONF='/usr/lib/systemd/system/sync-jars.service'
cat << EOF > "${SERVICE_CONF}"
[Unit]
Description=Period Jar Sync
[Service]
Type=simple
ExecStart=/bin/bash -c '${SYNC_SCRIPT} &>> /var/log/periodic-sync-jars.log'
Restart=on-failure
[Install]
WantedBy=multi-user.target
EOF
chmod a+rw "${SERVICE_CONF}"
systemctl daemon-reload
systemctl enable sync-jars
systemctl restart sync-jars
systemctl status sync-jars
Then, whenever you need a jarfile to be available everywhere you just copy the jarfile into hdfs:///usr/lib/jars, and the periodic poller will automatically stick it into /usr/lib/spark/jars and then you simply restart your kernel to pick it up. You can add jars to that HDFS directory either by SSH'ing in and running hdfs dfs -cp directly, or simply subprocess out from your Jupyter notebook:
import subprocess
sp = subprocess.Popen(
['hdfs', 'dfs', '-cp',
'gs://spark-lib/bigquery/spark-bigquery-latest.jar',
'hdfs:///usr/lib/jars/spark-bigquery-latest.jar'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, err = sp.communicate()
print(out)
print(err)
来源：https://stackoverflow.com/questions/55739463/cant-add-jars-pyspark-in-jupyter-of-google-dataproc