[KARAF-2131] Command output should be output immediately (not buffered) when using SSH client

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.3.0
• Component/s: karaf

Environment

$ uname -a
Linux * 3.2.13-grsec-xxxx-grs-ipv6-64 #1 SMP Thu Mar 29 09:48:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$ java -version
java version "1.7.0_11"
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)

• Assignee: Unassigned
• Reporter: Hendy Irawan
• Created: 19/Jan/13 05:27
• Updated: 15/Sep/18 16:35

Description

When running a long command directly on the shell, output is immediate.

However, when connecting using SSH (using Linux OpenSSH client), output seems to be buffered. So there's no output before command is completed or SSH connection is closed.

Same behavior when using Karaf's own client (bin/client). So this needs to be fixed on the server-side.

For example:

karaf_stg@luna2:~/karaf_template$ ssh -p 8122 karaf@localhost features:install -v -c soluvas-framework
..................... <-- looong time of silence here, then:
Installing feature soluvas-framework 2.0.0-SNAPSHOT
Installing feature soluvas-deps 2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.mongo/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.commons/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.json/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.async/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.cdi/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.data/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.push/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.jaxrs/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.security/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.facebook/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.ldap/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.image/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.social/2.0.0-SNAPSHOT
Installing bundle mvn:org.soluvas/org.soluvas.social.shell/2.0.0-SNAPSHOT
^^^^^ these lines are outputted all at once, after the command finishes, then the SSH connection is closed