mynameborat commented on a change in pull request #1439:
URL: https://github.com/apache/samza/pull/1439#discussion_r524347041
##########
File path:
samza-core/src/main/java/org/apache/samza/container/ContainerHeartbeatClient.java
##########
@@ -56,7 +57,8 @@
public ContainerHeartbeatClient(String coordinatorUrl, String
executionEnvContainerId) {
this.heartbeatEndpoint =
- String.format("%scontainerHeartbeat?executionContainerId=%s",
coordinatorUrl, executionEnvContainerId);
+ String.format("%s%s?%s=%s", coordinatorUrl,
CoordinationConstants.CLUSTERBASED_CONTAINER_HEARTBEAT_SERVELET,
Review comment:
I would suggest extracting the format as a constant and hardcoding some
of the format constants instead of doing it the other way.
e.g.
```
CONTAINER_HEART_BEAT_SERVLET_FORMAT = "%s" + "/containerHeartbeat";
CONTAINER_EXECUTION_ID_PARAM_FORMAT = "executionContainerId=" + "%s";
CONTAINER_HEART_BEAT_ENDPOINT_FORMAT = CONTAINER_HEART_BEAT_SERVLET_FORMAT
+ CONTAINER_EXECUTION_ID_PARAM_FORMAT
```
Or some flavor of the above, so that you can reuse the format across the
unit tests & other places in code. IMO, having the constants by themselves
still forces users to figure out how they come together and repetitive code
e.g. `"%s%s?%s=%s"` with readability hit as well.
##########
File path:
samza-core/src/main/java/org/apache/samza/coordinator/CoordinationConstants.java
##########
@@ -27,4 +27,7 @@ private CoordinationConstants() {}
public static final String APPLICATION_RUNNER_PATH_SUFFIX =
"ApplicationRunnerData";
public static final String RUNID_LOCK_ID = "runId";
public static final int LOCK_TIMEOUT_MS = 300000;
+ public static final String CLUSTERBASED_CONTAINER_HEARTBEAT_SERVELET =
"containerHeartbeat";
+ public static final String CLUSTERBASED_EXECUTION_ENVIRONMENT_CONTAINER_ID =
"executionContainerId";
+ public static final String CLUSTERBASED_COORDINATOR_URL =
"samza.autoscaling.server.url";
Review comment:
I'd also suggest moving this to Yarn specific constants file and remove
the `ClusterBased` prefix as these don't have any implications outside the YARN
world as they are all very specific to how YARN operates and aren't used in
general samza core orchestration.
[1] `samza.autoscaling.server.url` should have gotten cleaned up when we
removed the auto-scaling module. We can take this opportunity and rename this
configuration to `am.tracking.url` or something else as this is unused.
[2] If we want to keep it the way it is for backward compatibility reasons,
we should add a comment on how this is being used.
I am in favor of [1]. wdyt?
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