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https://issues.apache.org/jira/browse/FLINK-7365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16125774#comment-16125774
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Stephan Ewen commented on FLINK-7365:
-------------------------------------
One issue is that Flink instantiated Hadoop's file systems a bit too naively.
That results in repeated config loading / parsing.
In the course of improving Flink's handling of File Systems and
handling/loading of Hadoop's file systems, we should make sure that the Hadoop
File Systems are instantiated only once, which ensures that the conflig is
parsed once and not per checkpoint (that seems actually a bit too wasteful
anyways).
> excessive warning logs of attempt to override final parameter:
> fs.s3.buffer.dir
> -------------------------------------------------------------------------------
>
> Key: FLINK-7365
> URL: https://issues.apache.org/jira/browse/FLINK-7365
> Project: Flink
> Issue Type: Bug
> Components: Configuration
> Affects Versions: 1.3.0
> Reporter: Bowen Li
>
> I'm seeing hundreds of line of the following log in my JobManager log file:
> {code:java}
> 2017-08-03 19:48:45,330 WARN org.apache.hadoop.conf.Configuration
> - /usr/lib/hadoop/etc/hadoop/core-site.xml:an attempt to
> override final parameter: fs.s3.buffer.dir; Ignoring.
> 2017-08-03 19:48:45,485 WARN org.apache.hadoop.conf.Configuration
> - /etc/hadoop/conf/core-site.xml:an attempt to override final
> parameter: fs.s3.buffer.dir; Ignoring.
> 2017-08-03 19:48:45,486 WARN org.apache.hadoop.conf.Configuration
> - /usr/lib/hadoop/etc/hadoop/core-site.xml:an attempt to
> override final parameter: fs.s3.buffer.dir; Ignoring.
> 2017-08-03 19:48:45,626 WARN org.apache.hadoop.conf.Configuration
> - /etc/hadoop/conf/core-site.xml:an attempt to override final
> parameter: fs.s3.buffer.dir; Ignoring
> ......
> {code}
> Info of my Flink cluster:
> - Running on EMR with emr-5.6.0
> - Using FSStateBackend, writing checkpointing data files to s3
> - Configured s3 with S3AFileSystem according to
> https://ci.apache.org/projects/flink/flink-docs-release-1.4/setup/aws.html#set-s3-filesystem
> - AWS forbids resetting 'fs.s3.buffer.dir' value (it has a <final> tag on
> this property in core-site.xml), so I set 'fs.s3a.buffer.dir' as '/tmp'
> Here's my core-site.xml file:
> {code:java}
> <?xml version="1.0"?>
> <?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
> <!-- Licensed to the Apache Software Foundation (ASF) under one or more
> -->
> <!-- contributor license agreements. See the NOTICE file distributed with
> -->
> <!-- this work for additional information regarding copyright ownership.
> -->
> <!-- The ASF licenses this file to You under the Apache License, Version 2.0
> -->
> <!-- (the "License"); you may not use this file except in compliance with
> -->
> <!-- the License. You may obtain a copy of the License at
> -->
> <!--
> -->
> <!-- http://www.apache.org/licenses/LICENSE-2.0
> -->
> <!--
> -->
> <!-- Unless required by applicable law or agreed to in writing, software
> -->
> <!-- distributed under the License is distributed on an "AS IS" BASIS,
> -->
> <!-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> -->
> <!-- See the License for the specific language governing permissions and
> -->
> <!-- limitations under the License.
> -->
> <configuration>
> <property>
> <name>fs.s3.buffer.dir</name>
> <value>/mnt/s3,/mnt1/s3</value>
> <final>true</final>
> </property>
> <property>
> <name>fs.s3.impl</name>
> <value>org.apache.hadoop.fs.s3a.S3AFileSystem</value>
> </property>
> <property>
> <name>fs.s3n.impl</name>
> <value>com.amazon.ws.emr.hadoop.fs.EmrFileSystem</value>
> </property>
> <property>
> <name>ipc.client.connect.max.retries.on.timeouts</name>
> <value>5</value>
> </property>
> <property>
> <name>hadoop.security.key.default.bitlength</name>
> <value>256</value>
> </property>
> <property>
> <name>hadoop.proxyuser.hadoop.groups</name>
> <value>*</value>
> </property>
> <property>
> <name>hadoop.tmp.dir</name>
> <value>/mnt/var/lib/hadoop/tmp</value>
> </property>
> <property>
> <name>hadoop.proxyuser.hadoop.hosts</name>
> <value>*</value>
> </property>
> <property>
> <name>io.file.buffer.size</name>
> <value>65536</value>
> </property>
> <property>
> <name>fs.AbstractFileSystem.s3.impl</name>
> <value>org.apache.hadoop.fs.s3.EMRFSDelegate</value>
> </property>
> <property>
> <name>fs.s3a.buffer.dir</name>
> <value>/tmp</value>
> </property>
> <property>
> <name>fs.s3bfs.impl</name>
> <value>org.apache.hadoop.fs.s3.S3FileSystem</value>
> </property>
> </configuration>
> {code}
> This bug is about excessive logging.
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