[
https://issues.apache.org/jira/browse/FLINK-9626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16590612#comment-16590612
]
Stephan Ewen commented on FLINK-9626:
-------------------------------------
Note, that this happens only if there is no other FS factory in the classpath,
which is not commonly the case. So in practice, this should not really happen
outside test setups.
> Possible resource leak in FileSystem
> ------------------------------------
>
> Key: FLINK-9626
> URL: https://issues.apache.org/jira/browse/FLINK-9626
> Project: Flink
> Issue Type: Bug
> Components: FileSystem
> Affects Versions: 1.5.0
> Reporter: Piotr Nowojski
> Priority: Critical
>
> There is a potential resource leak in
> org.apache.flink.core.fs.FileSystem#getUnguardedFileSystem.
> Inside it there is a code:
>
> {code:java}
> // this "default" initialization makes sure that the FileSystem class works
> // even when not configured with an explicit Flink configuration, like on
> // JobManager or TaskManager setup
> if (FS_FACTORIES.isEmpty()) {
> initialize(new Configuration());
> }
> {code}
> which is executed on each cache miss. However this initialize method is also
> doing
>
>
> {code:java}
> CACHE.clear();
> {code}
> without closing file systems in CACHE (this could be problematic for
> HadoopFileSystem which is a wrapper around org.apache.hadoop.fs.FileSystem
> which is closable).
> Now if for example we are constantly accessing two different file systems
> (file systems are differentiated by combination of [schema and
> authority|https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Generic_syntax]
> part from the file system's URI) initialized from FALLBACK_FACTORY, each
> time we call getUnguardedFileSystem for one of them, that call will clear
> from CACHE entry for the other one. Thus we will constantly be creating new
> FileSystems without closing them.
> Solution could be to either not clear the CACHE or make sure that FileSystems
> are properly closed.
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
