Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2073
To verify this fix:
1. modify the `conf/bootstrap.conf` file to provide a *master encryption
key* (it doesn't matter if any `conf/nifi.properties` values are encrypted with
it, the mere presence will trigger the relevant code)
1. Start NiFi as normal (i.e. `$ ./bin/nifi.sh start`)
1. Verify that NiFi starts (UI, `nifi-bootstrap.log`, `nifi-app.log`, etc.)
1. Identify the NiFi process (*not* the bootstrap process) and kill it
(imitating an `OOME` or external process killing NiFi)
* `ps -ef | grep nifi` to get the PID
* `kill -9 <pid>`
1. Verify that NiFi successfully restarts
The `logs/nifi-bootstrap.log` will look like this:
```
2017-08-10 16:08:49,675 INFO [main] o.a.n.b.NotificationServiceManager
Successfully loaded the following 0 services: []
2017-08-10 16:08:49,679 INFO [main] org.apache.nifi.bootstrap.RunNiFi
Registered no Notification Services for Notification Type NIFI_STARTED
2017-08-10 16:08:49,679 INFO [main] org.apache.nifi.bootstrap.RunNiFi
Registered no Notification Services for Notification Type NIFI_STOPPED
2017-08-10 16:08:49,679 INFO [main] org.apache.nifi.bootstrap.RunNiFi
Registered no Notification Services for Notification Type NIFI_DIED
2017-08-10 16:08:49,736 INFO [main] org.apache.nifi.bootstrap.Command
Starting Apache NiFi...
2017-08-10 16:08:49,736 INFO [main] org.apache.nifi.bootstrap.Command
Working Directory:
/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT
2017-08-10 16:08:49,736 INFO [main] org.apache.nifi.bootstrap.Command
Command: /Users/alopresto/.jenv/versions/1.8/bin/java -classpath
/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./conf:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/javax.servlet-api-3.1.0.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/jcl-over-slf4j-1.7.25.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/jetty-schemas-3.1.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/jul-to-slf4j-1.7.25.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/log4j-over-slf4j-1.7.25.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/logback-c
lassic-1.2.3.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/logback-core-1.2.3.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/nifi-api-1.4.0-SNAPSHOT.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/nifi-framework-api-1.4.0-SNAPSHOT.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/nifi-nar-utils-1.4.0-SNAPSHOT.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/nifi-properties-1.4.0-SNAPSHOT.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/nifi-runtime-1.4.0-SNAPSHOT.jar:/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./lib/slf4j-api-1.7.25.jar
-Dorg.apache.jasper.compiler.disablejsr199=true
-Xmx512m -Xms512m -Djava.security.egd=file:/dev/urandom
-Dsun.net.http.allowRestrictedHeaders=true -Djava.net.preferIPv4Stack=true
-Djava.awt.headless=true -XX:+UseG1GC
-Djava.protocol.handler.pkgs=sun.net.www.protocol
-Dnifi.properties.file.path=/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./conf/nifi.properties
-Dnifi.bootstrap.listen.port=52192 -Dapp=NiFi
-Dorg.apache.nifi.bootstrap.config.log.dir=/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/logs
org.apache.nifi.NiFi -K
/Users/alopresto/Workspace/nifi/nifi-assembly/target/nifi-1.4.0-SNAPSHOT-bin/nifi-1.4.0-SNAPSHOT/./conf/sensitive.key
2017-08-10 16:08:49,749 INFO [main] org.apache.nifi.bootstrap.Command
Launched Apache NiFi with Process ID 90937
2017-08-10 16:08:50,294 INFO [NiFi Bootstrap Command Listener]
org.apache.nifi.bootstrap.RunNiFi Apache NiFi now running and listening for
Bootstrap requests on port 52193
-------------External command kills NiFi process-------------
2017-08-10 16:11:13,185 WARN [main] org.apache.nifi.bootstrap.RunNiFi
Apache NiFi appears to have died. Restarting...
2017-08-10 16:11:13,195 INFO [main] org.apache.nifi.bootstrap.Command
Launched Apache NiFi with Process ID 91211
2017-08-10 16:11:13,196 INFO [main] org.apache.nifi.bootstrap.RunNiFi
Successfully started Apache NiFi with PID 91211
2017-08-10 16:11:13,729 INFO [NiFi Bootstrap Command Listener]
org.apache.nifi.bootstrap.RunNiFi Apache NiFi now running and listening for
Bootstrap requests on port 52216
```
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