Github user ijokarumawak commented on the issue:
https://github.com/apache/nifi/pull/1523
I tested this PR on Ubuntu to confirm below:
1. 'exec' works as NIFI-2689 expected.
2. Don't break NIFI-3294, nifi-env.sh being used properly with 'run.as'
configuration.
3. 'restart' and other execution mode works properly.
To demonstrate how 'exec' changes process tree, I run `nifi.sh run`
with/without `exec` command in nifi.sh:
```bash
# Without exec
2934 pts/0 Ss 0:00 | \_ -bash (login as 'ubuntu' user and use
sudo to run the shell as root)
8424 pts/0 S+ 0:00 | \_ sudo
/opt/nifi-1.2.0-SNAPSHOT/bin/nifi.sh run
8425 pts/0 S+ 0:00 | \_ /bin/sh
/opt/nifi-1.2.0-SNAPSHOT/bin/nifi.sh run
8439 pts/0 Sl+ 0:00 | \_ /usr/bin/java -cp
/opt/nifi-1.2.0-SNAPSHOT/conf:/opt/nifi-1.2.0-SNAPS
8452 pts/0 Sl+ 0:09 | \_ java -classpath
/opt/nifi-1.2.0-SNAPSHOT/./conf:/opt/nifi-1.2.0-S
# With exec
2934 pts/0 Ss 0:00 | \_ -bash
8306 pts/0 S+ 0:00 | \_ sudo
/opt/nifi-1.2.0-SNAPSHOT/bin/nifi.sh run
8307 pts/0 Sl+ 0:00 | \_ /usr/bin/java -cp
/opt/nifi-1.2.0-SNAPSHOT/conf:/opt/nifi-1.2.0-SNAPSHOT/
8333 pts/0 Sl+ 0:12 | \_ java -classpath
/opt/nifi-1.2.0-SNAPSHOT/./conf:/opt/nifi-1.2.0-SNAPS
```
```bash
# Without execk
2934 pts/0 Ss 0:00 | \_ -bash
7799 pts/0 S+ 0:00 | \_ sudo
/opt/nifi-1.2.0-SNAPSHOT/bin/nifi.sh run
7800 pts/0 S+ 0:00 | \_ /bin/sh
/opt/nifi-1.2.0-SNAPSHOT/bin/nifi.sh run
7815 pts/0 S+ 0:00 | \_ sudo -u nifi sh -c
SCRIPT_DIR='/opt/nifi-1.2.0-SNAPSHOT/bin' && . '/o
7816 pts/0 S+ 0:00 | \_ sh -c
SCRIPT_DIR='/opt/nifi-1.2.0-SNAPSHOT/bin' && . '/opt/nifi-1
7818 pts/0 Sl+ 0:00 | \_ /usr/bin/java -cp
/opt/nifi-1.2.0-SNAPSHOT/conf:/opt/nifi-1.2
7831 pts/0 Sl+ 0:10 | \_ java
-classpath /opt/nifi-1.2.0-SNAPSHOT/./conf:/opt/nifi
# With exec
2934 pts/0 Ss 0:00 | \_ -bash
7922 pts/0 S+ 0:00 | \_ sudo
/opt/nifi-1.2.0-SNAPSHOT/bin/nifi.sh run
7923 pts/0 S+ 0:00 | \_ sudo -u nifi sh -c
SCRIPT_DIR='/opt/nifi-1.2.0-SNAPSHOT/bin' && . '/opt/n
7938 pts/0 S+ 0:00 | \_ sh -c
SCRIPT_DIR='/opt/nifi-1.2.0-SNAPSHOT/bin' && . '/opt/nifi-1.2.0
7940 pts/0 Sl+ 0:00 | \_ /usr/bin/java -cp
/opt/nifi-1.2.0-SNAPSHOT/conf:/opt/nifi-1.2.0-S
7953 pts/0 Sl+ 0:04 | \_ java -classpath
/opt/nifi-1.2.0-SNAPSHOT/./conf:/opt/nifi-1.2
```
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