camel sftp consumer becomes inactive - apache

Question

I am using apache camel version 2.10.0
I am using disconnect=true in my SFTP consumer. This works absolutely fine. However sometimes the consumer becomes completely idle. Upon redeploying the consumer it starts polling again. I have set polling interval as 10 seconds. Here is my complete route configuration.
Route/ Endpoint
<ftp:binding.sftp xmlns:ftp="urn:switchyard-component-camel-ftp:config:1.1" name="i014-SFTP-Central-abcbank-Local">
<ftp:contextMapper class="com.hm.goep.esb.composer.SI_InContextMapper"/>
<ftp:additionalUriParameters>
<ftp:parameter name="recursive" value="${goep.hm.abcbank.ftp_recursive}"/>
<ftp:parameter name="antInclude" value="*.csv"/>
<ftp:parameter name="consumer.bridgeErrorHandler" value="true"/>
<ftp:parameter name="localWorkDirectory" value="${goep.hm.esb-sap.in.filedirectory}/i014/"/>
<ftp:parameter name="passiveMode" value="${goep.hm.abcbank.ftp_passive_mode}"/>
<ftp:parameter name="binary" value="true"/>
</ftp:additionalUriParameters>
<ftp:directory>${goep.hm.i014.abcbank.ftpdirectory}</ftp:directory>
<ftp:autoCreate>false</ftp:autoCreate>
<ftp:host>${goep.hm.abcbank.ftp_server}</ftp:host>
<ftp:port>${goep.hm.abcbank.ftp_port}</ftp:port>
<ftp:username>${goep.hm.abcbank.ftp_user}</ftp:username>
<ftp:password>${goep.hm.abcbank.ftp_password}</ftp:password>
<ftp:binary>true</ftp:binary>
<ftp:disconnect>true</ftp:disconnect>
<ftp:stepwise>false</ftp:stepwise>
<ftp:throwExceptionOnConnectFailed>true</ftp:throwExceptionOnConnectFailed>
<ftp:consume>
<ftp:delete>true</ftp:delete>
<ftp:sortBy>file:modified</ftp:sortBy>
<ftp:readLock>changed</ftp:readLock>
<ftp:startingDirectoryMustExist>true</ftp:startingDirectoryMustExist>
<ftp:directoryMustExist>true</ftp:directoryMustExist>
<ftp:delay>${goep.hm.i014.abcbank.inbound.poll_interval}</ftp:delay>
</ftp:consume>
Thread dump
"Connect thread 110.75.144.86 session" daemon prio=10 tid=0x00007f7450012000 nid=0x1800 runnable [0x00007f7518408000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:152)
at java.net.SocketInputStream.read(SocketInputStream.java:122)
at com.jcraft.jsch.IO.getByte(IO.java:82)
at com.jcraft.jsch.Session.read(Session.java:885)
at com.jcraft.jsch.Session.run(Session.java:1289)
at java.lang.Thread.run(Thread.java:745)
"Camel (camel-101) thread #124 - sftp://testuser:******#11.11.11.11:22/download" daemon prio=10 tid=0x00007f748c090800 nid=0x7b46 in Object.wait() [0x00007f74cd35e000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000730625758> (a com.jcraft.jsch.Channel$MyPipedInputStream)
at java.io.PipedInputStream.read(PipedInputStream.java:327)
- locked <0x0000000730625758> (a com.jcraft.jsch.Channel$MyPipedInputStream)
at java.io.PipedInputStream.read(PipedInputStream.java:378)
- locked <0x0000000730625758> (a com.jcraft.jsch.Channel$MyPipedInputStream)
at com.jcraft.jsch.ChannelSftp._get(ChannelSftp.java:1041)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:944)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:922)
at org.apache.camel.component.file.remote.SftpOperations.retrieveFileToFileInLocalWorkDirectory(SftpOperations.java:675)
at org.apache.camel.component.file.remote.SftpOperations.retrieveFile(SftpOperations.java:542)
at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:317)
at org.apache.camel.component.file.remote.RemoteFileConsumer.processExchange(RemoteFileConsumer.java:92)
at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:189)
at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:155)
at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:142)
at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:92)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
During every polling, consumer first connect to server and then disconnect from the server. But during the last polling, consumer connected to SFTP server but didn't disconnect and then went idle.
Usual log during polling :
02-05-2016 20:48:36,662 INFO (org.apache.camel.component.file.remote.SftpOperations) [Camel (camel-99) thread #117 - sftp://xxxx:******#11.11.11.11:22/download] Connected to sftp://xxxx:******#11.11.11.11:22
02-05-2016 20:48:36,662 INFO (org.apache.camel.component.file.remote.SftpConsumer) [Camel (camel-99) thread #117 - sftp://xxxx:******#11.11.11.11:22/download] Connected and logged in to: sftp://xxxx:******#11.11.11.11:22
02-05-2016 20:48:38,539 INFO (org.apache.camel.component.file.remote.SftpOperations) [Camel (camel-99) thread #117 - sftp://xxxx:******#11.11.11.11:22/download] JSCH -> Disconnecting from 11.11.11.11 port 22
Error log after which consumer stopped polling:
02-05-2016 20:59:39,392 INFO (org.apache.camel.component.file.remote.SftpOperations) [Camel (camel-99) thread #117 - sftp://xxxx:******#11.11.11.11:22/download] Connected to sftp://xxxx:******#11.11.11.11:22
02-05-2016 20:59:39,392 INFO (org.apache.camel.component.file.remote.SftpConsumer) [Camel (camel-99) thread #117 - sftp://xxxx:******#11.11.11.11:22/download] Connected and logged in to: sftp://xxxx:******#11.11.11.11:22
Please suggest what can be done here.