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https://issues.apache.org/jira/browse/VFS-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046874#comment-17046874
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Bernd Eckenfels edited comment on VFS-627 at 2/27/20 6:35 PM:
--------------------------------------------------------------
Haven't seen another provider for VFS which does SFTP, sorry.
I am not sure if we can actually for the provider and apply your patch if the
jsch project is dormant. I think might not be possible for license reasons, but
you could fork it (or find someone who can do that, they need maven central
upload capabilities).
Do you see that with a specific kind of server software or multiple?
was (Author: b.eckenfels):
Haven't seen another provider for VFS which does SFTP, sorry. I am afraid this
requires and inspecting the protocol messages by somebody who knows the
protocol well. Do you see that with a specific kind of server software or
multiple?
> SFTP randomly hangs when copying a file on remote server
> --------------------------------------------------------
>
> Key: VFS-627
> URL: https://issues.apache.org/jira/browse/VFS-627
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Java 1.8.0_92
> VFS 2.1
> JSch 0.1.53
> Reporter: Henri Hagberg
> Priority: Major
>
> I have a process where a file is first copied over SFTP to local server and
> then on the remote server the file is copied to another location on that
> server for archiving. Both are done using {{FileObject#copyFrom}}. Now I've
> encountered twice the situation where during archiving (on remote server) the
> copy action hangs indefinitely (the process was left running for over 24
> hours). In both cases the issue happened when around 2000 files had been
> transferred (typical amount is under 100).
> The problem is difficult to reproduce since it doesn't always happen even
> with large number of files. Based on the stacktrace and random occurrences it
> might be a concurrency issue. The code using VFS however is single threaded.
> {code}
> Attaching to process ID 128021, please wait...
> Debugger attached successfully.
> Server compiler detected.
> JVM version is 25.92-b14
> Deadlock Detection:
> No deadlocks found.
> Thread 19073: (state = BLOCKED)
> Thread 128165: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=143 (Compiled
> frame)
> - org.apache.commons.vfs2.cache.SoftRefFilesCache$SoftRefReleaseThread.run()
> @bci=26, line=84 (Compiled frame)
> Thread 128164: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.io.PipedInputStream.awaitSpace() @bci=23, line=273 (Compiled frame)
> - java.io.PipedInputStream.receive(byte[], int, int) @bci=31, line=231
> (Compiled frame)
> - java.io.PipedOutputStream.write(byte[], int, int) @bci=77, line=149
> (Compiled frame)
> - com.jcraft.jsch.IO.put(byte[], int, int) @bci=7, line=64 (Compiled frame)
> - com.jcraft.jsch.Channel.write(byte[], int, int) @bci=7, line=438 (Compiled
> frame)
> - com.jcraft.jsch.Session.run() @bci=1260, line=1624 (Compiled frame)
> - java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)
> Thread 128139: (state = BLOCKED)
> Thread 128138: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=143 (Compiled
> frame)
> - java.lang.ref.ReferenceQueue.remove() @bci=2, line=164 (Compiled frame)
> - java.lang.ref.Finalizer$FinalizerThread.run() @bci=36, line=209
> (Interpreted frame)
> Thread 128137: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.Object.wait() @bci=2, line=502 (Compiled frame)
> - java.lang.ref.Reference.tryHandlePending(boolean) @bci=54, line=191
> (Compiled frame)
> - java.lang.ref.Reference$ReferenceHandler.run() @bci=1, line=153
> (Interpreted frame)
> Thread 128022: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - com.jcraft.jsch.Session.write(com.jcraft.jsch.Packet,
> com.jcraft.jsch.Channel, int) @bci=89, line=1261 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp.sendWRITE(byte[], long, byte[], int, int)
> @bci=191, line=2619 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp.access$100(com.jcraft.jsch.ChannelSftp,
> byte[], long, byte[], int, int) @bci=9, line=36 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp$1.write(byte[], int, int) @bci=77, line=791
> (Compiled frame)
> - java.io.BufferedOutputStream.write(byte[], int, int) @bci=20, line=122
> (Compiled frame)
> - org.apache.commons.vfs2.util.MonitorOutputStream.write(byte[], int, int)
> @bci=8, line=123 (Compiled frame)
> - java.io.BufferedOutputStream.flushBuffer() @bci=20, line=82 (Compiled
> frame)
> - java.io.BufferedOutputStream.write(byte[], int, int) @bci=39, line=126
> (Compiled frame)
> - org.apache.commons.vfs2.util.MonitorOutputStream.write(byte[], int, int)
> @bci=8, line=123 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(java.io.OutputStream,
> int) @bci=35, line=892 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(java.io.OutputStream)
> @bci=5, line=865 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(org.apache.commons.vfs2.FileContent)
> @bci=9, line=828 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(org.apache.commons.vfs2.FileObject)
> @bci=7, line=849 (Compiled frame)
> -
> org.apache.commons.vfs2.FileUtil.copyContent(org.apache.commons.vfs2.FileObject,
> org.apache.commons.vfs2.FileObject) @bci=7, line=90 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.AbstractFileObject.copyFrom(org.apache.commons.vfs2.FileObject,
> org.apache.commons.vfs2.FileSelector) @bci=148, line=338 (Compiled frame)
> ...
> {code}
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