Hi, Sorry to hear you're have an issue with VFS. I'm not sure how to help. The usual route for support here is to provide a failing unit test or a whole standalone project we could debug. Short of that I would start by making sure you're using the latest versions of everything. Providing a reproducible bug in a program is key.
Gary On Fri, Feb 25, 2022, 14:38 Shekhar B <shekhar....@gmail.com> wrote: > I have noticed slowness in reading data from SFTP server, I have 10 > parallel processes running in the different containers which are reading > this data and slowness is usually observed in one or two containers > randomly. I am using commons-vfs to read data from SFTP server and I have > extended SFTP related classes to add some sort logic. I am using centos-7.9 > to host my SFTP server. I have noticed the reader thread is in blocked > state and waiting for monitor thread to release lock. > > Can someone please guide me on how to fix this issue. > > > Thread dump: > > "Thread-135" #150 prio=5 os_prio=0 tid=0x00007f1e3808d800 nid=0x3a2 > waiting for monitor entry [0x00007f1ea5eed000] > java.lang.Thread.State: BLOCKED (on object monitor) > at > org.apache.commons.vfs2.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:306) > - waiting to lock <0x00000005cedf23f8> (a > org.apache.commons.vfs2.provider.sftp.MySftpFileSystem) > at > org.apache.commons.vfs2.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:301) > at > org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:76) > at > org.apache.commons.vfs2.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:56) > at > org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:711) > at > org.apache.commons.vfs2.impl.DefaultVfsComponentContext.resolveFile(DefaultVfsComponentContext.java:46) > at > org.apache.commons.vfs2.provider.AbstractLayeredFileProvider.findFile(AbstractLayeredFileProvider.java:54) > at > org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:711) > at > org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:677) > at > org.apache.commons.vfs2.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:632) > at > com.sqlstream.aspen.namespace.filevfs.FileVFSInputSource$FileReader.run(FileVFSInputSource.java:894) > at java.lang.Thread.run(Thread.java:748) > "Thread-134" #149 daemon prio=1 os_prio=0 tid=0x00007f1e381e7800 > nid=0x3a1 in Object.wait() [0x00007f1ea6af9000] > java.lang.Thread.State: TIMED_WAITING (on object monitor) > at java.lang.Object.wait(Native Method) > at java.io.PipedInputStream.read(PipedInputStream.java:326) > - eliminated <0x00000005d821ea90> (a > com.jcraft.jsch.Channel$MyPipedInputStream) > at java.io.PipedInputStream.read(PipedInputStream.java:377) > - locked <0x00000005d821ea90> (a > com.jcraft.jsch.Channel$MyPipedInputStream) > at com.jcraft.jsch.ChannelSftp.fill(ChannelSftp.java:2909) > at com.jcraft.jsch.ChannelSftp.header(ChannelSftp.java:2935) > at com.jcraft.jsch.ChannelSftp.ls(ChannelSftp.java:1643) > at com.jcraft.jsch.ChannelSftp.ls(ChannelSftp.java:1553) > at > org.apache.commons.vfs2.provider.sftp.MySftpFileObject.doListChildrenResolved(MySftpFileObject.java:376) > at > org.apache.commons.vfs2.provider.AbstractFileObject.getChildren(AbstractFileObject.java:1081) > - locked <0x00000005cedf23f8> (a > org.apache.commons.vfs2.provider.sftp.MySftpFileSystem) > at > com.sqlstream.aspen.namespace.filevfs.MyFileMonitor$FileMonitorAgent.checkForNewChildren(MyFileMonitor.java:458) > at > com.sqlstream.aspen.namespace.filevfs.MyFileMonitor$FileMonitorAgent.check(MyFileMonitor.java:543) > at > com.sqlstream.aspen.namespace.filevfs.MyFileMonitor$FileMonitorAgent.access$200(MyFileMonitor.java:376) > at > com.sqlstream.aspen.namespace.filevfs.MyFileMonitor.run(MyFileMonitor.java:321) > at java.lang.Thread.run(Thread.java:748) >
