Re: exception in windows while using FilePageStore

[Sven Meier]

Hi Ernesto,

I'm no expert in this, but as I understood it FileChannel should be save 
to be written to in parallel:

https://docs.oracle.com/javase/1.5.0/docs/api/java/nio/channels/FileChannel.html

"File channels are safe for use by multiple concurrent threads. ...  
Only one operation that involves the channel's position or can change 
its file's size may be in progress at any given time; attempts to 
initiate a second such operation while the first is still in progress 
will block until the first operation completes. ... The view of a file 
provided by an instance of this class is guaranteed to be consistent 
with other views of the same file provided by other instances in the 
same program."

This sounds related though:

https://stackoverflow.com/questions/45441249/why-does-java-filechannel-truncate-fail-predictably-on-windows-only

Regards
Sven


On 16.11.21 19:56, Ernesto Reinaldo Barreiro wrote:
Hi Sven,

Many thanks for your answer. Main problem is I do not have Windows
around... this happens only in our Jenkins (which needs to be a windows
machine). I did some googling around and it seems it can be the operating
system itself if you access the same file in a very fast sequence: this
might be our case, as we are generating many web sockets messages (pushing
components) and this seems to trigger page serialization.

On Linux and Mac we have no problems at all.


On Tue, Nov 16, 2021 at 7:28 PM Sven Meier <s...@meiers.net> wrote:

Hi Ernesto,

maybe an issue with concurrent file writes?

I've tested the new FilePageStore on Linux only, and as it seems I
didn't add any synchronization to it.

Could you try out FilePageStoreTest?

Regards
Sven


On 16.11.21 16:18, Ernesto Reinaldo Barreiro wrote:
Hi,

We are trying to use FilePageStore and we are getting following
exception (a lot of them actually)

he requested operation cannot be performed on a file with a user-mapped
section open
[2021-11-16T07:34:00.699Z] at

sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:92)
~[?:?]
[2021-11-16T07:34:00.699Z] at

sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
~[?:?]
[2021-11-16T07:34:00.699Z] at

sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
~[?:?]
[2021-11-16T07:34:00.699Z] at

sun.nio.fs.WindowsFileSystemProvider.newFileChannel(WindowsFileSystemProvider.java:121)
~[?:?]
[2021-11-16T07:34:00.699Z] at
java.nio.channels.FileChannel.open(FileChannel.java:298) ~[?:?]
[2021-11-16T07:34:00.699Z] at
java.nio.channels.FileChannel.open(FileChannel.java:357) ~[?:?]
[2021-11-16T07:34:00.699Z] at

org.apache.wicket.pageStore.FilePageStore.writeFile(FilePageStore.java:188)
[wicket-core-9.6.0.jar:9.6.0]
[2021-11-16T07:34:00.699Z] at

org.apache.wicket.pageStore.FilePageStore.addPersistedPage(FilePageStore.java:178)
[wicket-core-9.6.0.jar:9.6.0]
[2021-11-16T07:34:00.699Z] at

org.apache.wicket.pageStore.AbstractPersistentPageStore.addPage(AbstractPersistentPageStore.java:128)
[wicket-core-9.6.0.jar:9.6.0]
[2021-11-16T07:34:00.699Z] at

org.apache.wicket.pageStore.AsynchronousPageStore$PageAddingRunnable.run(AsynchronousPageStore.java:292)
[wicket-core-9.6.0.jar:9.6.0]
[2021-11-16T07:34:00.699Z] at java.lang.Thread.run(Thread.java:833) [?:?]

This does not happen for other operating systems. Is this a known
limitation? Is there anything else that needs to be configured at
operating
system level?

Thanks in advance.

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