HBASE-28158 Decouple RIT list management from TRSP #7375

Umeshkumar9414 · 2025-10-10T15:03:12Z

No description provided.

...erver/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionInTransitionTracker.java

apurtell · 2025-10-14T23:25:54Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java

+    return regionInTransitionTracker.isRegionInTransition(regionInfo);
+  }
+
+  public int getOngoingTRSPCount() {


Call it getInTransitCount()?

"Transit" means something different than "in transition". Javadoc the explaination.

how about scheduledRegionTransition ?

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java

apurtell · 2025-10-14T23:32:44Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateNode.java

  }

-  public boolean isInTransition() {
+  public boolean isOngoingTRSP() {


How about isInTransit?

And javadoc that "transit" means something different than "in transition".

how about changing to isTransitionScheduled?

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java

apurtell · 2025-10-14T23:43:29Z

...erver/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionInTransitionTracker.java

+    removeRegionInTransition(regionInfo);
+  }
+
+  private List<RegionState.State> getExceptedRegionStates(RegionStateNode regionStateNode) {


I think this method should be renamed and the code should be documented with comments. You are not really "excepting" regions.

You are basically waiting for the assignment state machine to complete and reach the desired terminal state by checking the region's current state against the table's state (ENABLED vs. DISABLED) to determine if the region is in the terminal state. If not, the region is added to the RIT list; otherwise, it is removed.

Your method naming and comments should communicate this theory of operation.

Related, there may be a minor race condition here. Consider if the table's state is changed (e.g., from ENABLED to DISABLING) at the same time a region for that table reports a state change. I think the tracker can momentarily use a stale table state here. However, this is self-correcting. As the region proceeds through its state transitions each subsequent call to the tracker will re-evaluate its status, and it will eventually be removed from RIT correctly.

Correct me if I am wrong but I think this race condition might not occur as before changing the state of any table of region (or running any procedure) we first take a lock (setState using HBCK may be an exception). And this lock might save us from this case.

...erver/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionInTransitionTracker.java

Umeshkumar9414 · 2025-10-15T11:14:45Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManagerUtil.java

  static void removeNonDefaultReplicas(MasterProcedureEnv env, Stream<RegionInfo> regions,
    int regionReplication) {
    // Remove from in-memory states
+    // TODO should we not confirm here that replica region are closed or not ?


@apurtell can you help me here? I was curious here why we are not confirming if replica regions are closed or not?

I am not sure about this either.

apurtell

This is good work and looks good to me. There is a checkstyle nit remaining to fix, please attend to that.

Apache9

Still need lots of polishing, but in general I think the approach is OK, it does not change the normal transition logic, just changes the way on how we show regions as in transition.

hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java

Apache9 · 2025-11-08T15:21:56Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/RegionServerTracker.java

    // splittingServersFromWALDir are being actively split -- the directory in the FS ends in
    // '-SPLITTING'. Each splitting server should have a corresponding SCP. Log if not.
-    splittingServersFromWALDir.stream().filter(s -> !deadServersFromPE.contains(s))
+    splittingServersFromWALDir.stream().filter(s -> !deadServersFromPE.containsKey(s))


Why we change the parameter from Set to a Map but we only use its containsKey method?

we are passing it to ServerManager where we are adding both the values to deadServermap (ref)

Then better change the parameter name?

@Umeshkumar9414 Here, I've replied some of the comments.

Ping @Umeshkumar9414

Apache9 · 2025-11-08T15:22:34Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java

   * @param liveServersFromWALDir the live region servers from wal directory.
   */
-  void findDeadServersAndProcess(Set<ServerName> deadServersFromPE,
+  void findDeadServersAndProcess(Map<ServerName, Long> deadServersFromPE,


Why just a parameter type change without chaging any real logic?

I think the value is the crash time? We should use it when setting up dead servers?

yes we should use it. We are using it in line 445 (deadservers::putIfAbsent).

I didn't need to change the code becuase lambda and method overloading.

Let's change the parameter name.

@Umeshkumar9414

ping @Umeshkumar9414

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java

Apache9 · 2025-11-08T15:37:49Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java


  private final int forceRegionRetainmentRetries;

+  private final RegionInTransitionTracker regionInTransitionTracker;


Why not put this into RegionStates? In this way we can reduce the code change i think.

There are couple of reasons for this

I wanted regionTransitionTracker to follow meta (RegionStateStore in code) and regionStates doesn't do that. Sometime we update region state in memory and update meta in next step of procedure.

regionInTransitionTracker needed tableStateManager and I doesn't wanted to pass tableStateManager to regionSates. Another option would be create tracker in AssignmentManager itself and then pass that in constructor.

Considering above I feel keeping this in AM is better.

I think we could keep it here and also pass and store it in RegionStates, if we use it in both places.

@Umeshkumar9414

Ping @Umeshkumar9414

We are not using it in RegionStates as of now.
I do thought of a use in RegionStateNode though, I was thinking to include activeTransitProcedureCount in RegionInTransitionTracker only. But then again in that way I had to pass it till RegionStateNode.

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStateNode.java

hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ServerCrashProcedure.java

hbase-server/src/main/java/org/apache/hadoop/hbase/master/DeadServer.java

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java

Apache-HBase · 2025-11-20T23:01:40Z

💔 -1 overall

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Umeshkumar9414 · 2025-11-21T06:02:51Z

TestSecureIPC test failed in the build, I was not able to run this test successfully in my machine for master branch as well, becuase of keytab issue. Looks like I might need some changes in my machine to run these tests, that I am not aware of.

Umeshkumar9414 · 2025-11-24T17:21:04Z

@Apache9 can you help me with review ?

Apache9

We are almost done, thanks for the patience.

Now I'm OK with not putting RegionInTransitionStateTracker in RegionStates. The only left thing is about the isRegionInRegionStates method, do we really use this method in our code base? Can we just remove it?

Apache9 · 2025-11-27T09:48:12Z

...erver/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionInTransitionTracker.java

+    // AssignmentManager calls setTableStateManager once hbase:meta is confirmed online, if it is
+    // still null it means confirmation is still pending. One should not access TableStateManger
+    // till the time.
+    if (TableName.isMetaTableName(tableName)) {


Maybe here we could add an assert TableName.isMetaTableName(tableName);, and then return true?

Anyway, throwing a RuntimeException is also acceptable as in production environment we may disable assertion.

Better add something like "CODE-BUG" to tell developers that you may write code wrong.

Somehow I try to avoid if else and liked the idea of assert. Will do that.

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStates.java

hbase-server/src/main/resources/hbase-webapps/master/deadRegionServers.jsp

…ion of meta online

Apache-HBase · 2025-11-28T17:05:28Z

🎊 +1 overall

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Apache-HBase · 2025-11-28T19:56:36Z

🎊 +1 overall

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Apache-HBase · 2025-11-28T20:55:13Z

🎊 +1 overall

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Apache-HBase · 2025-11-29T00:01:33Z

💔 -1 overall

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Apache9

+1.

Thanks @Umeshkumar9414!

Umeshkumar9414 · 2025-11-30T19:02:32Z

Can we merge it @Apache9 ? I think @apurtell is out for some days and I was thinking if it can get merge before any new commit that conflict these changes.
I have opened PR for other branches as well except branch-2.6 where it was clean cherry pick from branch-2

Apache9 · 2025-12-01T15:31:08Z

I'm OK with merging it.

I'm in a business trip in Singapore, so let me see if I can get a device to merge and cherry-pick this to all branches...

Thanks.

Close #7447 Co-authored-by: ukumawat <ukumawat@salesforce.com> Signed-off-by: Andrew Purtell <apurtell@apache.org> Signed-off-by: Duo Zhang <zhangduo@apache.org> (cherry picked from commit 7d604d4)

d-c-manning · 2025-12-05T22:01:52Z

hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java

+    ServerName crashedServerName = scp.getServerName();
+    for (RegionInfo regionInfo : regionsOnCrashedServer) {
+      RegionStateNode node = regionStates.getOrCreateRegionStateNode(regionInfo);
+      if (node.getRegionLocation() == crashedServerName) {


is this always guaranteed to be comparable via ==? Or do we have to, or would it be safer to, use equals?

Ah, it should be equals, and we should log a warn when they do not equal, as this method is called before we assign any regions on the crashed region server, so the regionsOnCrashedServer should all be on the crashed server.

Let me prepare an addendum. Thanks @d-c-manning !

Thanks @d-c-manning, @Apache9 let me know if I can help here.

Umeshkumar9414 · 2025-12-08T06:35:33Z

Hi @Apache9, @apurtell , @virajjasani while building the phoenix with these changes I got to know that Phoenix uses isRegionInTransition method of RegionStates class that I removed with this change. And this version of pheonix will be facing compile issue after this change. Wanted to know what do we do in such cases ?

 [ERROR] /****/phoenix/phoenix-core/src/it/java/org/apache/phoenix/rpc/PhoenixServerRpcIT.java:[247,79] cannot find symbol
  symbol:   method isRegionInTransition(org.apache.hadoop.hbase.client.RegionInfo)
  location: class org.apache.hadoop.hbase.master.assignment.RegionStates

virajjasani · 2025-12-08T06:40:45Z

@Umeshkumar9414 the usage seems to be in the test code so we can remove it if it is not really necessary, or use JMX metrics to find out RIT count in the test

apurtell · 2025-12-17T16:31:37Z

@Umeshkumar9414 @virajjasani

RegionStates is annotated @InterfaceAudience.Private so Phoenix was wrong to ever use this interface. Phoenix must solve the issue themselves and not rely on Private annotated code. This is well understood by now, it keeps coming up that they do this and get broken.

Umeshkumar9414 · 2025-12-17T16:49:13Z

@Umeshkumar9414 @virajjasani

RegionStates is annotated @InterfaceAudience.Private so Phoenix was wrong to ever use this interface. Phoenix must solve the issue themselves and not rely on Private annotated code. This is well understood by now, it keeps coming up that they do this and get broken.

Raised an JIRA https://issues.apache.org/jira/browse/PHOENIX-7741 and solved it in phoenix.

Umeshkumar9414 force-pushed the HBASE-28158_2 branch from af75dcb to 99caa2c Compare October 10, 2025 15:07