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https://issues.apache.org/jira/browse/NIFI-4160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16077932#comment-16077932
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ASF GitHub Bot commented on NIFI-4160:
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Github user pvillard31 commented on the issue:
https://github.com/apache/nifi/pull/1991
+1, merging to master, thanks @ijokarumawak
> SFTPTransfer should specify connection timeout
> ----------------------------------------------
>
> Key: NIFI-4160
> URL: https://issues.apache.org/jira/browse/NIFI-4160
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.0.0
> Reporter: Koji Kawamura
> Assignee: Koji Kawamura
>
> For FTP/SFTP, we use com.jcraft.jsch library. When XXXSFTP processor make use
> of the library, there are two occasions to set connection timeout. One is
> connecting a session (Socket), and the other is opening a SFTP channel.
> Currently we set a connection timeout which can be specified via processor
> property for connecting a session, but not for opening an SFTP channel.
> Then the library uses default 10ms x 2000 retry to open the channel. With
> slow SFTP servers it's possible that opening channel takes longer than 10ms,
> which can cause following error:
> {code}
> java.io.IOException: Failed to obtain connection to remote host due to
> com.jcraft.jsch.JSchException: channel is not opened
> {code}
> We should specify connection timeout for opening channel as well.
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