Frequently Asked Questions around PyFlink.
Q2: Java gateway process exited before sending its port number
Q2: ClassNotFoundException: com.mysql.cj.jdbc.Driver
Q1: OverflowError: timeout value is too large
Q2: An error occurred while calling z:org.apache.flink.client.python.PythonEnvUtils.resetCallbackClient
Q1: 'tuple' object has no attribute '_values'
Q2: AttributeError: 'int' object has no attribute 'encode'
Q3: Types.BIG_INT() VS Types.LONG()
PyFlink only provides official installation packages which contain JAR packages for Scala 2.11 before Flink 1.15 and Scala 2.12 since Flink 1.15+. If you want to use Scala 2.12, you can download the binary distribution of Scala 2.12, unzip it and then set the environment variable FLINK_HOME to point to the unzipped directory. This makes it use the JAR packages specified by FLINK_HOME instead of the JAR packages under PyFlink installation package. You can refer to PyFlink documentation for more details.
The exception stack is as following:
Traceback (most recent call last):
File "/Users/dianfu/code/src/github/pyflink-faq/testing/test_utils.py", line 122, in setUp
self.t_env = TableEnvironment.create(EnvironmentSettings.in_streaming_mode())
File "/Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/apache_flink-1.14.4-py3.8-macosx-10.9-x86_64.egg/pyflink/table/environment_settings.py", line 267, in in_streaming_mode
get_gateway().jvm.EnvironmentSettings.inStreamingMode())
File "/Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/apache_flink-1.14.4-py3.8-macosx-10.9-x86_64.egg/pyflink/java_gateway.py", line 62, in get_gateway
_gateway = launch_gateway()
File "/Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/apache_flink-1.14.4-py3.8-macosx-10.9-x86_64.egg/pyflink/java_gateway.py", line 112, in launch_gateway
raise Exception("Java gateway process exited before sending its port number")
Exception: Java gateway process exited before sending its port numberThis issue is usually caused by the reason that PyFlink isn't installed correctly. You can verify whether PyFlink is installed correctly as following:
Execute the following command:
python -c "import pyflink;import os;print(os.path.dirname(os.path.abspath(pyflink.__file__)))"
It will print something like the following:
/Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/pyflinkExecute the following command:
ls -lh /Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/pyflink/The structure should be as following:
total 136
-rw-r--r-- 1 dianfu staff 1.3K Apr 25 09:26 README.txt
-rw-r--r-- 1 dianfu staff 1.9K Apr 25 09:26 __init__.py
drwxr-xr-x 11 dianfu staff 352B Apr 25 09:26 __pycache__
drwxr-xr-x 25 dianfu staff 800B Apr 25 09:26 bin
drwxr-xr-x 21 dianfu staff 672B Apr 25 09:26 common
drwxr-xr-x 13 dianfu staff 416B Apr 25 09:26 conf
drwxr-xr-x 20 dianfu staff 640B Apr 25 09:26 datastream
drwxr-xr-x 4 dianfu staff 128B Apr 25 09:26 examples
-rw-r--r-- 1 dianfu staff 3.2K Apr 25 09:26 find_flink_home.py
drwxr-xr-x 25 dianfu staff 800B Apr 25 09:26 fn_execution
-rw-r--r-- 1 dianfu staff 9.1K Apr 25 09:26 gen_protos.py
-rw-r--r-- 1 dianfu staff 7.6K Apr 25 09:26 java_gateway.py
drwxr-xr-x 11 dianfu staff 352B Apr 25 09:26 lib
drwxr-xr-x 28 dianfu staff 896B Apr 25 09:26 licenses
drwxr-xr-x 4 dianfu staff 128B Apr 25 09:26 log
drwxr-xr-x 5 dianfu staff 160B Apr 25 09:26 metrics
drwxr-xr-x 4 dianfu staff 128B Apr 25 09:26 opt
drwxr-xr-x 11 dianfu staff 352B Apr 25 09:26 plugins
-rw-r--r-- 1 dianfu staff 1.3K Apr 25 09:26 pyflink_callback_server.py
-rw-r--r-- 1 dianfu staff 12K Apr 25 09:26 pyflink_gateway_server.py
-rw-r--r-- 1 dianfu staff 5.3K Apr 25 09:26 serializers.py
-rw-r--r-- 1 dianfu staff 7.9K Apr 25 09:26 shell.py
drwxr-xr-x 31 dianfu staff 992B Apr 25 09:26 table
drwxr-xr-x 6 dianfu staff 192B Apr 25 09:26 util
-rw-r--r-- 1 dianfu staff 1.1K Apr 25 09:26 version.py
Please check whether the directories lib, opt are available. Besides, the jar packages under these directories should be as following:
(.venv) (base) dianfu@B-7174MD6R-1908 testing % ls -lh /Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/pyflink/lib
total 383344
-rw-r--r-- 1 dianfu staff 84K Apr 25 19:58 flink-csv-1.14.4.jar
-rw-r--r-- 1 dianfu staff 137M Apr 25 19:58 flink-dist_2.11-1.14.4.jar
-rw-r--r-- 1 dianfu staff 150K Apr 25 19:58 flink-json-1.14.4.jar
-rw-r--r-- 1 dianfu staff 7.4M Apr 25 19:58 flink-shaded-zookeeper-3.4.14.jar
-rw-r--r-- 1 dianfu staff 40M Apr 25 19:58 flink-table_2.11-1.14.4.jar
-rw-r--r-- 1 dianfu staff 203K Apr 25 19:58 log4j-1.2-api-2.17.1.jar
-rw-r--r-- 1 dianfu staff 295K Apr 25 19:58 log4j-api-2.17.1.jar
-rw-r--r-- 1 dianfu staff 1.7M Apr 25 19:58 log4j-core-2.17.1.jar
-rw-r--r-- 1 dianfu staff 24K Apr 25 19:58 log4j-slf4j-impl-2.17.1.jar
(.venv) (base) dianfu@B-7174MD6R-1908 testing % ls -lh /Users/dianfu/code/src/github/pyflink-faq/testing/.venv/lib/python3.8/site-packages/pyflink/opt
total 76464
-rw-r--r-- 1 dianfu staff 37M Apr 25 19:58 flink-python_2.11-1.14.4.jar
-rw-r--r-- 1 dianfu staff 472K Apr 25 19:58 flink-sql-client_2.11-1.14.4.jarQ1: InaccessibleObjectException: Unable to make field private final byte[] java.lang.String.value accessible: module java.base does not "opens java.lang" to unnamed module @4e4aea35
: java.lang.reflect.InaccessibleObjectException: Unable to make field private final byte[] java.lang.String.value accessible: module java.base does not "opens java.lang" to unnamed module @4e4aea35
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:106)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132)
at org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:69)
at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.clean(StreamExecutionEnvironment.java:2138)
at org.apache.flink.table.planner.plan.nodes.exec.common.CommonExecSink.createSinkFunctionTransformation(CommonExecSink.java:331)
at org.apache.flink.table.planner.plan.nodes.exec.common.CommonExecSink.applySinkProvider(CommonExecSink.java:306)
at org.apache.flink.table.planner.plan.nodes.exec.common.CommonExecSink.createSinkTransformation(CommonExecSink.java:146)
at org.apache.flink.table.planner.plan.nodes.exec.stream.StreamExecSink.translateToPlanInternal(StreamExecSink.java:140)
at org.apache.flink.table.planner.plan.nodes.exec.ExecNodeBase.translateToPlan(ExecNodeBase.java:134)
This is an issue around Java 17. It still doesn't support Java 17 in Flink. You can refer to FLINK-15736 for more details. To solve this issue, you need to use JDK 1.8 or JDK 11.
Q1: Could not find any factory for identifier 'xxx' that implements 'org.apache.flink.table.factories.DynamicTableFactory' in the classpath.
Exception Stack:
py4j.protocol.Py4JJavaError: An error occurred while calling o13.execute.
: org.apache.flink.table.api.ValidationException: Unable to create a source for reading table 'default_catalog.default_database.sourceKafka'.
Table options are:
'connector'='kafka'
'format'='json'
'properties.bootstrap.servers'='192.168.101.109:9092'
'scan.startup.mode'='earliest-offset'
'topic'='pyflink_test'
at org.apache.flink.table.factories.FactoryUtil.createTableSource(FactoryUtil.java:150)
at org.apache.flink.table.planner.plan.schema.CatalogSourceTable.createDynamicTableSource(CatalogSourceTable.java:116)
at org.apache.flink.table.planner.plan.schema.CatalogSourceTable.toRel(CatalogSourceTable.java:82)
at org.apache.calcite.rel.core.RelFactories$TableScanFactoryImpl.createScan(RelFactories.java:495)
at org.apache.calcite.tools.RelBuilder.scan(RelBuilder.java:1099)
at org.apache.calcite.tools.RelBuilder.scan(RelBuilder.java:1123)
at org.apache.flink.table.planner.plan.QueryOperationConverter$SingleRelVisitor.visit(QueryOperationConverter.java:351)
at org.apache.flink.table.planner.plan.QueryOperationConverter$SingleRelVisitor.visit(QueryOperationConverter.java:154)
at org.apache.flink.table.operations.CatalogQueryOperation.accept(CatalogQueryOperation.java:68)
at org.apache.flink.table.planner.plan.QueryOperationConverter.defaultMethod(QueryOperationConverter.java:151)
at org.apache.flink.table.planner.plan.QueryOperationConverter.defaultMethod(QueryOperationConverter.java:133)
at org.apache.flink.table.operations.utils.QueryOperationDefaultVisitor.visit(QueryOperationDefaultVisitor.java:92)
at org.apache.flink.table.operations.CatalogQueryOperation.accept(CatalogQueryOperation.java:68)
at org.apache.flink.table.planner.plan.QueryOperationConverter.lambda$defaultMethod$0(QueryOperationConverter.java:150)
at java.util.Collections$SingletonList.forEach(Collections.java:4824)
at org.apache.flink.table.planner.plan.QueryOperationConverter.defaultMethod(QueryOperationConverter.java:150)
at org.apache.flink.table.planner.plan.QueryOperationConverter.defaultMethod(QueryOperationConverter.java:133)
at org.apache.flink.table.operations.utils.QueryOperationDefaultVisitor.visit(QueryOperationDefaultVisitor.java:47)
at org.apache.flink.table.operations.ProjectQueryOperation.accept(ProjectQueryOperation.java:76)
at org.apache.flink.table.planner.calcite.FlinkRelBuilder.queryOperation(FlinkRelBuilder.scala:184)
at org.apache.flink.table.planner.delegation.PlannerBase.translateToRel(PlannerBase.scala:219)
at org.apache.flink.table.planner.delegation.PlannerBase$$anonfun$1.apply(PlannerBase.scala:182)
at org.apache.flink.table.planner.delegation.PlannerBase$$anonfun$1.apply(PlannerBase.scala:182)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at scala.collection.Iterator$class.foreach(Iterator.scala:891)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at org.apache.flink.table.planner.delegation.PlannerBase.translate(PlannerBase.scala:182)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.translate(TableEnvironmentImpl.java:1665)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.translateAndClearBuffer(TableEnvironmentImpl.java:1657)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.execute(TableEnvironmentImpl.java:1607)
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 org.apache.flink.api.python.shaded.py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at org.apache.flink.api.python.shaded.py4j.Gateway.invoke(Gateway.java:282)
at org.apache.flink.api.python.shaded.py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at org.apache.flink.api.python.shaded.py4j.commands.CallCommand.execute(CallCommand.java:79)
at org.apache.flink.api.python.shaded.py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.flink.table.api.ValidationException: Cannot discover a connector using option: 'connector'='kafka'
at org.apache.flink.table.factories.FactoryUtil.enrichNoMatchingConnectorError(FactoryUtil.java:587)
at org.apache.flink.table.factories.FactoryUtil.getDynamicTableFactory(FactoryUtil.java:561)
at org.apache.flink.table.factories.FactoryUtil.createTableSource(FactoryUtil.java:146)
... 45 more
Caused by: org.apache.flink.table.api.ValidationException: Could not find any factory for identifier 'kafka' that implements 'org.apache.flink.table.factories.DynamicTableFactory' in the classpath.
Available factory identifiers are:
blackhole
datagen
filesystem
print
at org.apache.flink.table.factories.FactoryUtil.discoverFactory(FactoryUtil.java:399)
at org.apache.flink.table.factories.FactoryUtil.enrichNoMatchingConnectorError(FactoryUtil.java:583)
... 47 more
It reuses the Java connectors implementations in PyFlink and most connectors are not bundled in the official PyFlink (and also Flink) distribution except the following connectors: blackhole, datagen, filesystem and print. So you need to specify the connector JAR package explicitly when executing PyFlink jobs:
- The connector JAR package could be found in the corresponding connector page in the official Flink documentation. For example, you can open the Kafka connector page and search keyword "SQL Client JAR" which is a fat JAR of Kafka connector.
- It should be noted that you should use the fat JAR which contains all the dependencies. Besides, the version of the connector JAR should be consistent with PyFlink version.
- For how to specify the connector JAR in PyFlink jobs, you can refer to the dependency management page of official PyFlink documentation.
py4j.protocol.Py4JJavaError: An error occurred while calling o13.execute.
: org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
...
Caused by: java.io.IOException: unable to open JDBC writer
at org.apache.flink.connector.jdbc.internal.JdbcOutputFormat.open(JdbcOutputFormat.java:145)
at org.apache.flink.connector.jdbc.internal.GenericJdbcSinkFunction.open(GenericJdbcSinkFunction.java:52)
at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:34)
at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:100)
at org.apache.flink.streaming.api.operators.StreamSink.open(StreamSink.java:46)
at org.apache.flink.streaming.runtime.tasks.RegularOperatorChain.initializeStateAndOpenOperators(RegularOperatorChain.java:110)
at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreGates(StreamTask.java:711)
at org.apache.flink.streaming.runtime.tasks.StreamTaskActionExecutor$1.call(StreamTaskActionExecutor.java:55)
at org.apache.flink.streaming.runtime.tasks.StreamTask.restoreInternal(StreamTask.java:687)
at org.apache.flink.streaming.runtime.tasks.StreamTask.restore(StreamTask.java:654)
at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958)
at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:927)
at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:766)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: com.mysql.cj.jdbc.Driver
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at org.apache.flink.util.FlinkUserCodeClassLoader.loadClassWithoutExceptionHandling(FlinkUserCodeClassLoader.java:64)
at org.apache.flink.util.ChildFirstClassLoader.loadClassWithoutExceptionHandling(ChildFirstClassLoader.java:74)
at org.apache.flink.util.FlinkUserCodeClassLoader.loadClass(FlinkUserCodeClassLoader.java:48)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$SafetyNetWrapperClassLoader.loadClass(FlinkUserCodeClassLoaders.java:172)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider.loadDriver(SimpleJdbcConnectionProvider.java:90)
at org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider.getLoadedDriver(SimpleJdbcConnectionProvider.java:100)
at org.apache.flink.connector.jdbc.internal.connection.SimpleJdbcConnectionProvider.getOrEstablishConnection(SimpleJdbcConnectionProvider.java:117)
at org.apache.flink.connector.jdbc.internal.JdbcOutputFormat.open(JdbcOutputFormat.java:143)
This indicates that it the JDBC driver JAR package is missing. It should be noted that the JDBC driver is also required when using JDBC connector. The JAR packages of the JDBC drivers could be found in the JDBC connector page.
Q3: NoSuchMethodError: org.apache.flink.table.factories.DynamicTableFactory$Context.getCatalogTable()Lorg/apache/flink/table/catalog/CatalogTable
java.lang.NoSuchMethodError: org.apache.flink.table.factories.DynamicTableFactory$Context.getCatalogTable()Lorg/apache/flink/table/catalog/CatalogTable;
at org.apache.flink.streaming.connectors.kafka.table.KafkaDynamicTableFactory.createDynamicTableSource(KafkaDynamicTableFactory.java:145)
at org.apache.flink.table.factories.FactoryUtil.createTableSource(FactoryUtil.java:147)
... 39 more
It indicates that the version of the Kafka connector JAR package isn't consistent with the PyFlink version. This is the same case for all connectors. You need to make sure that the connector version is consistent with the PyFlink version.
File "D:\Anaconda3\envs\py37\lib\threading.py", line 926, in _bootstrap_inner
self.run()
File "D:\Anaconda3\envs\py37\lib\site-packages\apache_beam\runners\worker\data_plane.py", line 218, in run
while not self._finished.wait(next_call - time.time()):
File "D:\Anaconda3\envs\py37\lib\threading.py", line 552, in wait
signaled = self._cond.wait(timeout)
File "D:\Anaconda3\envs\py37\lib\threading.py", line 300, in wait
gotit = waiter.acquire(True, timeout)
OverflowError: timeout value is too large
This exception only occurs on Windows. It doesn't affect the execution of PyFlink jobs and so you could ignore it usually. Besides, you could also upgrade PyFlink versions to 1.12.8, 1.13.7, 1.14.4 or 1.15.0 where this issue has been fixed. You could refer to FLINK-25883 for more details.
Q2: An error occurred while calling z:org.apache.flink.client.python.PythonEnvUtils.resetCallbackClient
py4j.protocol.Py4jError: An error occurred while calling z:org.apache.flink.client.python.PythonEnvUtils.resetCallbackClient. Trace:
org.apache.flink.api.python.shaded.py4j.Py4jException: Method resetCallbackClient([class java.lang.String, class java.lang.Integer]) does not exist
at org.apache.flink.api.python.shaded.py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:318)
...
This exception only occurs when the version of the flink-python jar (located in site-packages/pyflink/opt) isn't consistent with PyFlink version. It usually happens when you have tried to install multiple PyFlink versions and something wrong happens which make multiple versions mixed in your environment. You can try to reinstall PyFlink in a clean environment.
Caused by: java.util.concurrent.ExecutionException: java.lang.RuntimeException: Error received from SDK harness for instruction 4:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 289, in _execute response = task()
File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 362, in <lambda> lambda:
self.create_worker().do_instruction(request), request)
File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 607, in do_instruction getattr(request, request_type),
request.instruction_id)
File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 644, in process_bundle
bundle_processor.process_bundle(instruction_id))
File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/bundle_processor.py", line 1000, in process_bundle element.data)
File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/bundle_processor.py", line 228, in process_encoded self.output(decoded_value) File "apache_beam/runners/worker/operations.py", line 357, in apache_beam.runners.worker.operations.Operation.output
File "apache_beam/runners/worker/operations.py", line 359, in apache_beam.runners.worker.operations.Operation.output
File "apache_beam/runners/worker/operations.py", line 221, in apache_beam.runners.worker.operations.SingletonConsumerSet.receive
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 158, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 174, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 104, in
pyflink.fn_execution.beam.beam_operations_fast.IntermediateOutputProcessor.process_outputs
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 158, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 174, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 92, in
pyflink.fn_execution.beam.beam_operations_fast.NetworkOutputProcessor.process_outputs
File "pyflink/fn_execution/beam/beam_coder_impl_fast.pyx", line 101, in
pyflink.fn_execution.beam.beam_coder_impl_fast.FlinkLengthPrefixCoderBeamWrapper.encode_to_stream
File "pyflink/fn_execution/coder_impl_fast.pyx", line 271, in pyflink.fn_execution.coder_impl_fast.IterableCoderImpl.encode_to_stream
File "pyflink/fn_execution/coder_impl_fast.pyx", line 399, in pyflink.fn_execution.coder_impl_fast.RowCoderImpl.encode_to_stream
File "pyflink/fn_execution/coder_impl_fast.pyx", line 389, in pyflink.fn_execution.coder_impl_fast.RowCoderImpl.encode_to_streamAttributeError: 'tuple'
object has no attribute '_values'
This issue is usually caused by the reason that it returns an object other than Row type in a Python user-defined function, however, the return type of the function is declared as Row. Please double check the return value of the Python user-defined function to make sure that the type of the returned value is consitent with the declartion.
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 71, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 85, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
File "pyflink/fn_execution/coder_impl_fast.pyx", line 83, in pyflink.fn_execution.coder_impl_fast.TableFunctionRowCoderImpl.encode_to_stream
File "pyflink/fn_execution/coder_impl_fast.pyx", line 256, in pyflink.fn_execution.coder_impl_fast.FlattenRowCoderImpl._encode_one_row
File "pyflink/fn_execution/coder_impl_fast.pyx", line 260, in pyflink.fn_execution.coder_impl_fast.FlattenRowCoderImpl._encode_one_row_with_row_kind
File "pyflink/fn_execution/coder_impl_fast.pyx", line 244, in pyflink.fn_execution.coder_impl_fast.FlattenRowCoderImpl._encode_one_row_to_buffer
File "pyflink/fn_execution/coder_impl_fast.pyx", line 550, in pyflink.fn_execution.coder_impl_fast.FlattenRowCoderImpl._encode_field_simple
AttributeError: 'int' object has no attribute 'encode'
This reason to this issue is usually that the actual result value of a Python user-defined function isn't consistent with the declared result type of the Python user-defined function.
It should be noted that Types.BIG_INT() represents type information for the Java BigInteger, while Types.LONG() represents type information for long integer. There are several users are using Types.BIG_INT() for long integer by mistake.
