gulecroc opened a new issue, #4624:
URL: https://github.com/apache/bookkeeper/issues/4624
**QUESTION**
Hello,
I'd like to change the format of the data returned by the CLI, particularly
the Bookkeeper Shell.
Currently, everything goes through the logs.
Would it be possible to define a more usable format like the API with JSON
output ?
Exemple :
* currently :
* log4j2-bkcli.xml :
```xml
<Configuration status="warn" monitorInterval="10">
<Properties>
<Property name="bookkeeper.cli.log.root.level">ERROR</Property>
<Property
name="bookkeeper.cli.log.root.appender">CONSOLE</Property>
</Properties>
<Appenders>
<Console name="CONSOLE" target="SYSTEM_OUT">
<PatternLayout pattern="%m%n"/>
</Console>
</Appenders>
<Loggers>
<Root level="${sys:bookkeeper.cli.log.root.level}">
<AppenderRef ref="${sys:bookkeeper.cli.log.root.appender}"/>
</Root>
<Logger name="org.apache.bookkeeper.bookie.BookieShell"
level="INFO">
<AppenderRef ref="CONSOLE"/>
</Logger>
<Logger name="org.apache.bookkeeper.tools.cli" level="INFO">
<AppenderRef ref="CONSOLE"/>
</Logger>
</Loggers>
</Configuration>
```
* command :
```
$ BOOKIE_LOG_CONF=conf/log4j2-bkcli.xml bin/bookkeeper shell listbookies -a
```
* result :
```
All Bookies :
BookieID:eda-pulsar-helm-chart-bookie-1.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local:3181,
IP:10.125.32.9, Port:3181,
Hostname:eda-pulsar-helm-chart-bookie-1.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local
BookieID:eda-pulsar-helm-chart-bookie-0.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local:3181,
IP:10.125.33.90, Port:3181,
Hostname:eda-pulsar-helm-chart-bookie-0.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local
BookieID:eda-pulsar-helm-chart-bookie-2.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local:3181,
IP:10.125.34.20, Port:3181,
Hostname:eda-pulsar-helm-chart-bookie-2.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local
```
* with output format :
* command :
```
$ BOOKIE_LOG_CONF=conf/log4j2-bkcli.xml bin/bookkeeper shell listbookies
-a --output json
```
* result :
```json
{
"eda-pulsar-helm-chart-bookie-1.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local:3181"
: null,
"eda-pulsar-helm-chart-bookie-0.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local:3181"
: null,
"eda-pulsar-helm-chart-bookie-2.eda-pulsar-helm-chart-bookie.n-eda-d.svc.cluster.local:3181"
: null
}
```
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