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From "Stephan Ewen (Jira)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-17923) It will throw MemoryAllocationException if rocksdb statebackend and Python UDF are used in the same slot
Date Tue, 02 Jun 2020 13:27:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-17923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17123783#comment-17123783
] 

Stephan Ewen commented on FLINK-17923:
--------------------------------------

[~dian.fu] Using Task off-heap memory is probably a good workaround for now.

> It will throw MemoryAllocationException if rocksdb statebackend and Python UDF are used
in the same slot  
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-17923
>                 URL: https://issues.apache.org/jira/browse/FLINK-17923
>             Project: Flink
>          Issue Type: Bug
>          Components: API / Python, Runtime / State Backends
>    Affects Versions: 1.10.0, 1.11.0
>            Reporter: Dian Fu
>            Assignee: Dian Fu
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 1.11.0
>
>
> For the following job:
> {code}
> import logging
> import os
> import shutil
> import sys
> import tempfile
> from pyflink.datastream import StreamExecutionEnvironment
> from pyflink.table import TableConfig, StreamTableEnvironment, DataTypes
> from pyflink.table.udf import udf
> def word_count():
>     content = "line Licensed to the Apache Software Foundation ASF under one " \
>               "line or more contributor license agreements See the NOTICE file " \
>               "line distributed with this work for additional information " \
>               "line regarding copyright ownership The ASF licenses this file " \
>               "to you under the Apache License Version the " \
>               "License you may not use this file except in compliance " \
>               "with the License"
>     t_config = TableConfig()
>     env = StreamExecutionEnvironment.get_execution_environment()
>     t_env = StreamTableEnvironment.create(env, t_config)
>     # register Results table in table environment
>     tmp_dir = tempfile.gettempdir()
>     result_path = tmp_dir + '/result'
>     if os.path.exists(result_path):
>         try:
>             if os.path.isfile(result_path):
>                 os.remove(result_path)
>             else:
>                 shutil.rmtree(result_path)
>         except OSError as e:
>             logging.error("Error removing directory: %s - %s.", e.filename, e.strerror)
>     logging.info("Results directory: %s", result_path)
>     sink_ddl = """
>         create table Results(
>             word VARCHAR,
>             `count` BIGINT
>         ) with (
>             'connector' = 'blackhole'
>         )
>         """
>     t_env.sql_update(sink_ddl)
>     @udf(input_types=[DataTypes.BIGINT()], result_type=DataTypes.BIGINT())
>     def inc(count):
>         return count + 1
>     t_env.register_function("inc", inc)
>     elements = [(word, 1) for word in content.split(" ")]
>     t_env.from_elements(elements, ["word", "count"]) \
>          .group_by("word") \
>          .select("word, count(1) as count") \
>          .select("word, inc(count) as count") \
>          .insert_into("Results")
>     t_env.execute("word_count")
> if __name__ == '__main__':
>     logging.basicConfig(stream=sys.stdout, level=logging.INFO, format="%(message)s")
>     word_count()
> {code}
> It will throw the following exception if rocksdb state backend is used:
> {code}
> Caused by: org.apache.flink.util.FlinkException: Could not restore keyed state backend
for KeyedProcessOperator_c27dcf7b54ef6bfd6cff02ca8870b681_(1/1) from any of the 1 provided
restore options.
> 	at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:135)
> 	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.keyedStatedBackend(StreamTaskStateInitializerImpl.java:317)
> 	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.streamOperatorStateContext(StreamTaskStateInitializerImpl.java:144)
> 	... 9 more
> Caused by: java.io.IOException: Failed to acquire shared cache resource for RocksDB
> 	at org.apache.flink.contrib.streaming.state.RocksDBOperationUtils.allocateSharedCachesIfConfigured(RocksDBOperationUtils.java:212)
> 	at org.apache.flink.contrib.streaming.state.RocksDBStateBackend.createKeyedStateBackend(RocksDBStateBackend.java:516)
> 	at org.apache.flink.streaming.api.operators.StreamTaskStateInitializerImpl.lambda$keyedStatedBackend$1(StreamTaskStateInitializerImpl.java:301)
> 	at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.attemptCreateAndRestore(BackendRestorerProcedure.java:142)
> 	at org.apache.flink.streaming.api.operators.BackendRestorerProcedure.createAndRestore(BackendRestorerProcedure.java:121)
> 	... 11 more
> Caused by: org.apache.flink.runtime.memory.MemoryAllocationException: Could not created
the shared memory resource of size 536870920. Not enough memory left to reserve from the slot's
managed memory.
> 	at org.apache.flink.runtime.memory.MemoryManager.lambda$getSharedMemoryResourceForManagedMemory$8(MemoryManager.java:603)
> 	at org.apache.flink.runtime.memory.SharedResources.createResource(SharedResources.java:130)
> 	at org.apache.flink.runtime.memory.SharedResources.getOrAllocateSharedResource(SharedResources.java:72)
> 	at org.apache.flink.runtime.memory.MemoryManager.getSharedMemoryResourceForManagedMemory(MemoryManager.java:617)
> 	at org.apache.flink.runtime.memory.MemoryManager.getSharedMemoryResourceForManagedMemory(MemoryManager.java:566)
> 	at org.apache.flink.contrib.streaming.state.RocksDBOperationUtils.allocateSharedCachesIfConfigured(RocksDBOperationUtils.java:208)
> 	... 15 more
> Caused by: org.apache.flink.runtime.memory.MemoryReservationException: Could not allocate
536870920 bytes. Only 454033416 bytes are remaining.
> 	at org.apache.flink.runtime.memory.MemoryManager.reserveMemory(MemoryManager.java:461)
> 	at org.apache.flink.runtime.memory.MemoryManager.lambda$getSharedMemoryResourceForManagedMemory$8(MemoryManager.java:601)
> 	... 20 more
> {code}



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