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https://issues.apache.org/jira/browse/NIFI-2199?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15707177#comment-15707177
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ASF subversion and git services commented on NIFI-2199:
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Commit e3c7611347a57df1e50ce495efb4fc5d777ba4f6 in nifi's branch
refs/heads/master from jpercivall
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=e3c7611 ]
NIFI-3112 Revert "NIFI-2199 - allows nifi.sh restart through ssh"
This reverts commit 88d125137e3bf3faf80b522edf5cf14f99419d60.
This closes #1282.
Signed-off-by: Andy LoPresto <[email protected]>
> NiFi cannot be restarted through SSH (nifi.sh hangs)
> ----------------------------------------------------
>
> Key: NIFI-2199
> URL: https://issues.apache.org/jira/browse/NIFI-2199
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.0.0, 0.5.1, 0.7.0, 0.6.1
> Reporter: Michal Klempa
> Priority: Minor
> Labels: initscript
> Fix For: 1.1.0
>
>
> When NiFi is to restarted using SSH from remote host, nifi.sh causes SSH to
> hang on open io streams.
> Steps to reproduce:
> 1. HostA - NiFi instalation
> 2. HostB - client machine
> 3. log to HostB
> 4. issue a command
> {code}
> ssh root@HostA /etc/init.d/nifi restart
> {code}
> Expected behavior: NiFi is restarted, SSH command exits with 0
> Actual behavior: NiFi is restarted, SSH command hang on
> This seems to be somehow related to SSH handling IO streams of process. Seems
> like detached NiFi java process does not close stdin/out/err (i do not know
> precisely) leading to sshd waiting for some input/output to come to client.
> I was able to do a quick&dirty fix in nifi.sh as follows:
> 1. on existing nifi installation, in file /etc/init.d/nifi find the line
> {code}
> (cd "${NIFI_HOME}" && ${sudo_cmd_prefix} "${JAVA}" -cp
> "${BOOTSTRAP_CLASSPATH}" -Xms12m -Xmx24m
> -Dorg.apache.nifi.bootstrap.config.file="${BOOTSTRAP_CONF}"
> org.apache.nifi.bootstrap.RunNiFi $@ &)
> {code}
> its line number 214 (true branch of if [ "$1"] = "start"] condition).
> 2. replace it by line:
> {code}
> (cd "${NIFI_HOME}" && ${sudo_cmd_prefix} "${JAVA}" -cp
> "${BOOTSTRAP_CLASSPATH}" -Xms12m -Xmx24m
> -Dorg.apache.nifi.bootstrap.config.file="${BOOTSTRAP_CONF}"
> org.apache.nifi.bootstrap.RunNiFi $@ > /dev/null 2>&1 < /dev/null &)
> {code}
> This simply redirects stdin from /dev/null to NiFi java process and redirects
> stdout/err to /dev/null letting SSH to close the session.
> After applying this fix, I am able to restart NiFi remotely using SSH.
> Use case for this scenario: When Flow Manager develop flow.xml.gz on
> localhost/testing environments, usually deployment to production environment
> is handled by jenkins/bamboo CI tools. These tools need to log in, upload new
> flow.xml.gz and restart NiFi. All remotely using SSH.
> If somebody can advice me where in the source code is this line of code
> located, I can prepare a pull request for this quick&dirty fix.
> But. Maybe we may want to go further and investigate what to do with IO
> streams inside Java...
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