Flink still only works with Java 8 at the moment. It will be a while
until we properly support Java 11.
On 02/05/2019 13:58, Günter Hipler wrote:
swissbib@sb-ust1:~$ java -version
openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment (build 11.0.2+9-Ubuntu-3ubuntu118.04.3)
OpenJDK 64-Bit Server VM (build 11.0.2+9-Ubuntu-3ubuntu118.04.3, mixed
mode, sharing)
swissbib@sb-ust1:~$
Is version 8 more appropriate?
Günter
On 02.05.19 13:48, Chesnay Schepler wrote:
Which java version are you using?
On 01/05/2019 21:31, Günter Hipler wrote:
Hi,
For the first time I'm trying to set up a standalone cluster. My
current configuration
4 server (1 jobmanger and 3 taskmanager)
a) starting the cluster
swissbib@sb-ust1:/swissbib_index/apps/flink/bin$ ./start-cluster.sh
Starting cluster.
Starting standalonesession daemon on host sb-ust1.
Starting taskexecutor daemon on host sb-ust2.
Starting taskexecutor daemon on host sb-ust3.
Starting taskexecutor daemon on host sb-ust4.
On the taskmanager side I get the error
2019-05-01 21:16:32,794 WARN akka.remote.ReliableDeliverySupervisor
- Association with remote system [akka.ssl.tcp://flink@sb-ust1:6123]
has failed, address is now gated for [50] ms. Reason: [class [B
cannot be cast to class [C ([B and [C are in module java.base of
loader 'bootstrap')]
2019-05-01 21:16:41,932 INFO
org.apache.flink.runtime.taskexecutor.TaskExecutor - Could not
resolve ResourceManager address
akka.ssl.tcp://flink@sb-ust1:6123/user/resourcemanager, retrying in
10000 ms: Ask timed out on
[ActorSelection[Anchor(akka.ssl.tcp://flink@sb-ust1:6123/),
Path(/user/resourcemanager)]] after [10000 ms]. Sender[null] sent
message of type "akka.actor.Identify"..
2019-05-01 21:17:01,960 INFO
org.apache.flink.runtime.taskexecutor.TaskExecutor - Could not
resolve ResourceManager address
akka.ssl.tcp://flink@sb-ust1:6123/user/resourcemanager, retrying in
10000 ms: Ask timed out on
[ActorSelection[Anchor(akka.ssl.tcp://flink@sb-ust1:6123/),
Path(/user/resourcemanager)]] after [10000 ms]. Sender[null] sent
message of type "akka.actor.Identify"..
port 6123 is allowed on the jobmanager but I haven't created a
specialized flink - user.
- Is this necessary? if yes, is it possible to define another user
for communication purposes?
I followed the documentation to setup a ssl based communication
(https://ci.apache.org/projects/flink/flink-docs-release-1.8/ops/security-ssl.html#example-ssl-setup-standalone-and-kubernetes)
and created a keystore as described:
keytool -genkeypair -alias swissbib.internal -keystore
internal.keystore -dname "CN=flink.internal" -storepass verysecret
-keypass verysecret -keyalg RSA -keysize 4096
and deployed the flink-conf.yaml on the whole cluster
(part of flink-conf.yaml)
security.ssl.internal.enabled: true
security.ssl.internal.keystore:
/swissbib_index/apps/flink/conf/internal.keystore
security.ssl.internal.truststore:
/swissbib_index/apps/flink/conf/internal.keystore
security.ssl.internal.keystore-password: verysecret
security.ssl.internal.truststore-password: verysecret
security.ssl.internal.key-password: verysecret
but this doesn't solve the problem - still no connection between
task-managers and job-managers.
- another question: which ports have to be enabled in the firewall
for a standalone cluster?
Thanks for any hints!
Günter
