Dear readers,
We used jsch to collect and distribute files 24/24 7/7
And we have notice sometime that the file collect or distribution is blocked.
It has already happened on some commands : "connect", "cd", "ls" and "pwd"
where our threads can be blocked.
MY QUESTIONS
============
Does the use of a timeout at connection time can solve all these problems of
"blocked thread" ?
public void connect(int connectTimeout) throws JSchException{
Or do we have to set other parameters like .... setServerAliveCountMax to 0
session.setServerAliveCountMax(0);
C.f. Colin's mail 2013-05-03 21:15
Thanks.
Laurent.
===========================================================================
Here is some jstack examples of block
"Thread-258" prio=10 tid=0x000000000b01e800 nid=0x211e runnable
[0x0000000067638000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:150)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.net.SocketInputStream.read(SocketInputStream.java:203)
at com.jcraft.jsch.IO.getByte(IO.java:73)
at com.jcraft.jsch.Session.connect(Session.java:263)
at com.jcraft.jsch.Session.connect(Session.java:183)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.distributorFTP.SFTPClientWrapper.connect(SFTPClientWrapper.java:117)
- locked <0x000000064f417bd0> (a
fr.alcatel.cit.products.c3s.dataFlow.dpm.distributorFTP.SFTPClientWrapper)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.distributorFTP.SFTPClientWrapper.connect(SFTPClientWrapper.java:77)
- locked <0x000000064f417bd0> (a
fr.alcatel.cit.products.c3s.dataFlow.dpm.distributorFTP.SFTPClientWrapper)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.collectorFTP.CollectorFTPClient.connect(CollectorFTPClient.java:399)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.collectorFTP.CollectorFTPClient.reconnect(CollectorFTPClient.java:2284)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.collectorFTP.CollectorFTPClient.isFtpCollectorInstanceAuthorizedToCollect(CollectorFTPClient.java:660)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.collectorFTP.CollectorFTPClient.collectorProcedure(CollectorFTPClient.java:620)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.collectorFTP.CollectorFTPClient.access$1000(CollectorFTPClient.java:90)
at
fr.alcatel.cit.products.c3s.dataFlow.dpm.collectorFTP.CollectorFTPClient$ThreadForScan.run(CollectorFTPClient.java:228)
at java.lang.Thread.run(Thread.java:722)
Other Example
Thread 30610: (state = BLOCKED)
- java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
imprecise)
- java.io.PipedInputStream.read() @bci=142, line=310 (Compiled frame)
- java.io.PipedInputStream.read(byte[], int, int) @bci=43, line=361 (Compiled
frame)
- com.jcraft.jsch.ChannelSftp.fill(byte[], int, int) @bci=17, line=2325
(Compiled frame)
- com.jcraft.jsch.ChannelSftp.header(com.jcraft.jsch.Buffer,
com.jcraft.jsch.ChannelSftp$Header) @bci=12, line=2351 (Compiled frame)
- com.jcraft.jsch.ChannelSftp._realpath(java.lang.String) @bci=27, line=1810
(Compiled frame)
- com.jcraft.jsch.ChannelSftp.cd(java.lang.String) @bci=14, line=268
(Interpreted frame)
- dpm.distributorFTP.SFTPClientWrapper.cd(java.lang.String) @bci=22, line=142
(Compiled frame)
- dpm.collectorFTP.CollectorFTPClient.scanServer() @bci=225, line=776 (Compiled
frame)
- dpm.collectorFTP.CollectorFTPClient.collectorProcedure() @bci=144, line=612
(Interpreted frame)
-
dpm.collectorFTP.CollectorFTPClient.access$1000(dpm.collectorFTP.CollectorFTPClient)
@bci=1, line=90 (Compiled frame)
- dpm.collectorFTP.CollectorFTPClient$ThreadForScan.run() @bci=28, line=226
(Compiled frame)
- java.lang.Thread.run() @bci=11, line=619 (Interpreted frame)
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