bitflicker64 commented on PR #3359:
URL: https://github.com/apache/hugegraph/pull/3359#issuecomment-6335341552

   The earlier review comments below still apply at 347b9b7; this head does not 
fix them.
   
   - Critical: `PartitionPatrolResultTest` lives in `hg-pd-test/src/main/java`, 
so the module's main compile has to resolve `TaskAPI` and `PDRestService` from 
the `hg-pd-service` artifact. In a reactor `package` build that artifact is the 
Spring Boot repackaged jar, where these classes sit under `BOOT-INF/classes/`, 
so this import and the next one fail with `cannot find symbol` and the whole 
build stops at `hg-pd-test`. This is why the `Package` step fails at this head 
in the `pd_store / pd`, `pd_store / store` and `cluster / cluster-test` jobs of 
run 39293045735, with exactly these two errors at 
`PartitionPatrolResultTest.java:[31,36]` and `[32,39]`, so none of the PD 
tests, including the new ones, ran in CI. I reproduced it locally with `mvn -o 
package -pl hugegraph-pd/hg-pd-test -am -Dmaven.test.skip=true` (JDK 17): 
`hg-pd-service` SUCCESS, `hg-pd-test` FAILURE with the same two errors, and 
`unzip -l` shows `BOOT-INF/classes/org/apache/hugegraph/pd/rest/TaskAPI.class`. 
The PR's lo
 cal runs passed because `mvn test` resolves the reactor module to 
`target/classes` instead of the repackaged jar. No other main source in 
`hg-pd-test` imports a class from `hg-pd-service`. Please move 
`testLeadershipChangeAfterPatrolReturnsStructuredRefusal` and 
`testCompactionRefusalSurvivesLeadershipRegain` into 
`hg-pd-service/src/test/java` (for example into `TaskAPIResultTest`, which 
already builds `TaskAPI` with a stubbed `PDRestService`), drop these two 
imports here, and confirm the root `mvn clean package -Dmaven.test.skip=true` 
passes. (https://github.com/apache/hugegraph/pull/3359#discussion_r4317533361)
   - Important: `result` can be null here, and then this line throws a 
`NullPointerException` that the `catch (PDException e)` does not catch, so the 
request fails with a 500 and no `status` envelope. 
`TaskScheduleService.patrolPartitionsWithResult()` returns null whenever its 
own `isLeader()` check fails. `runLeaderTask` only rejects that when its outer 
checks also see a follower, so the case where the scheduler saw a follower but 
both outer checks saw a leader reaches this line. That is the same case this PR 
already handles for compaction 
(`PartitionPatrolResultTest.testCompactionRefusalSurvivesLeadershipRegain` 
stubs the scheduler with its follower return while `isLeader(true)` stays 
true). I ran the same setup for the other task routes at this head: 
`patrolPartitions` threw `NullPointerException: Cannot invoke 
"...PartitionPatrolResult.getPartitions()" because "result" is null`, while 
`patrolStores` returned `{"status": 0,"stores": [ ]}`, `splitPartitions` 
`{"status": 0,"partitio
 ns": [ ]}`, `balanceLeaders` `{}` and `balancePartitions` 
`{"outcome":"skipped","status":0}`, all success shapes for work that never ran. 
So the guarantee in the `runLeaderTask` comment holds only for compaction. 
Please map the scheduler's follower result to `NOT_LEADER` in `PDRestService` 
the same way `dbCompaction()` now does for `patrolPartitionsWithResult()` and 
`patrolStores()`, where null means only follower, and add a null check here. 
`autoSplitPartition()`, `balancePartitionShard()` and 
`balancePartitionLeader()` also return null or an empty map on other paths, so 
they need a distinct follower signal from the scheduler (for example throwing 
`NOT_LEADER` there) rather than a null check. Please also add a regression next 
to the compaction one. 
(https://github.com/apache/hugegraph/pull/3359#discussion_r4317533389)


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