logback

[Dmitry Golubets]

Hi,

documentation says: "Users willing to use logback instead of log4j can just exclude log4j (or delete it from the lib/ folder)."

But then Flink just doesn't start. I added logback-classic 1.10 to it's lib folder, but still get NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException

Something else I should do? Or should I use an older logback version?

[rmetzger0]

Hi Dmitry,

Did you also check out this documentation page? https://ci.apache.org/projects/flink/flink-docs-release-1.2/monitoring/best_practices.html#use-logback-when-running-flink-on-a-cluster

On Tue, Feb 7, 2017 at 1:07 PM, Dmitry Golubets <[hidden email]> wrote:

Hi,

documentation says: "Users willing to use logback instead of log4j can just exclude log4j (or delete it from the lib/ folder)."

But then Flink just doesn't start. I added logback-classic 1.10 to it's lib folder, but still get NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException

Something else I should do? Or should I use an older logback version?

[Dmitry Golubets]

Hi Robert,

After reading that link I've added the missing log4j-over-slf4j.

Now Flink is able to start, but I get another exception when uploading a job:

NoClassDefFoundError: org/slf4j/event/LoggingEvent

...

	at org.apache.flink.api.scala.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:170)
	at org.apache.flink.api.scala.ClosureCleaner$.clean(ClosureCleaner.scala:164)

On Tue, Feb 7, 2017 at 4:23 PM, Robert Metzger <[hidden email]> wrote:

Hi Dmitry,

Did you also check out this documentation page? https://ci.apache.org/projects/flink/flink-docs-release-1.2/monitoring/best_practices.html#use-logback-when-running-flink-on-a-cluster

On Tue, Feb 7, 2017 at 1:07 PM, Dmitry Golubets <[hidden email]> wrote:

Hi,

documentation says: "Users willing to use logback instead of log4j can just exclude log4j (or delete it from the lib/ folder)."

But then Flink just doesn't start. I added logback-classic 1.10 to it's lib folder, but still get NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException

Something else I should do? Or should I use an older logback version?

[Dmitry Golubets]

Update: I've now used 1.1.3 versions as in the example in the docs and it works!

Looks like these is an incompatibility with the latest logback.

On Wed, Feb 8, 2017 at 3:20 PM, Dmitry Golubets <[hidden email]> wrote:

Hi Robert,

After reading that link I've added the missing log4j-over-slf4j.

Now Flink is able to start, but I get another exception when uploading a job:

NoClassDefFoundError: org/slf4j/event/LoggingEvent

...

	at org.apache.flink.api.scala.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:170)
	at org.apache.flink.api.scala.ClosureCleaner$.clean(ClosureCleaner.scala:164)

On Tue, Feb 7, 2017 at 4:23 PM, Robert Metzger <[hidden email]> wrote:

Hi Dmitry,

Did you also check out this documentation page? https://ci.apache.org/projects/flink/flink-docs-release-1.2/monitoring/best_practices.html#use-logback-when-running-flink-on-a-cluster

On Tue, Feb 7, 2017 at 1:07 PM, Dmitry Golubets <[hidden email]> wrote:

Hi,

documentation says: "Users willing to use logback instead of log4j can just exclude log4j (or delete it from the lib/ folder)."

But then Flink just doesn't start. I added logback-classic 1.10 to it's lib folder, but still get NoClassDefFoundError: ch/qos/logback/core/joran/spi/JoranException

Something else I should do? Or should I use an older logback version?