HBASE-28567 Race condition causes MetaRegionLocationCache to never se… #5874

vincentpoon · 2024-05-06T01:00:22Z

…t watcher to populate meta location

Apache9 · 2024-05-06T01:11:38Z

I think we should change the logic in MetaRegionLocationCache instead of in ZKWatcher?

vincentpoon · 2024-05-06T01:16:33Z

Sure but right now the problem is ZKWatcher#filterMetaReplicaNodes returns empty List if the input nodes is null. So MetaRegionLocationCache can't tell the difference between:

node exists but has no children
node does not exist

So seems like we might need to change ZKWatcher either way.

virajjasani · 2024-05-06T01:18:44Z

I agree, we will need to change ZKWatcher one way or another, and currently this is the only caller

Apache-HBase · 2024-05-06T01:24:42Z

🎊 +1 overall

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Apache-HBase · 2024-05-06T01:25:20Z

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Apache-HBase · 2024-05-06T01:26:20Z

🎊 +1 overall

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Apache-HBase · 2024-05-06T01:26:45Z

🎊 +1 overall

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Apache9 · 2024-05-06T01:31:32Z

Sure but right now the problem is ZKWatcher#filterMetaReplicaNodes returns empty List if the input nodes is null. So MetaRegionLocationCache can't tell the difference between:

node exists but has no children

node does not exist

So seems like we might need to change ZKWatcher either way.

It is just a bit strange that in ZKUtil we eat the NoNodeException while at the upper layer we create a new NoNodeException and throw it...

Better just return null in ZKWatcher, and in MetaRegionLocationCache, we do not break the loop if the return value is null.

WDYT?

Thanks.

virajjasani · 2024-05-06T01:34:36Z

Better just return null in ZKWatcher, and in MetaRegionLocationCache, we do not break the loop if the return value is null.

We need to retry in the case of race condition, that's the main difference from filterMetaReplicaNodes() returning null.
So even if we do not break the loop in MetaRegionLocationCache, we will not retry for genuine race condition case.

virajjasani · 2024-05-06T01:41:46Z

Oh, I see you are talking about breaking this loop:

        try {
          znodes = watcher.getMetaReplicaNodesAndWatchChildren();
          break;
        } catch (KeeperException ke) {
...
...

Yeah that might also work.

vincentpoon · 2024-05-06T01:49:55Z

It is just a bit strange that in ZKUtil we eat the NoNodeException while at the upper layer we create a new NoNodeException and throw it...

I think the original author of getMetaReplicaNodesAndWatchChildren never envisioned base znode not existing. If there were a ZKUtil method that didn't swallow the exception, we would use that instead. IMO getMetaReplicaNodesAndWatchChildren is doing something very specific and should in fact throw in that situation.

But happy to change ZKWatcher to return null and have MetaRegionLocationCache stay in the loop when null if folks are in agreement here that that's the best path forward. Note that this would mean that before /hbase/meta-region-server gets created, all Regionservers in cluster would be retrying listChildren calls against ZK, instead of waiting for watcher notifications.
Whereas with the original patch, all the behavior stays the same except under the race condition where base /hbase znode hasn't been created yet.

virajjasani · 2024-05-06T02:10:44Z

Btw just in case if we end up updating MetaRegionLocationCache#loadMetaLocationsFromZk, we might have to keep retryCounter.sleepUntilNextRetry() out of catching KeeperException.

virajjasani · 2024-05-06T02:23:19Z

I am in favor of keeping patch like this, so that we don't have to keep calling listChildren until /hbase/meta-region-server gets created. I know you have valid concern about not re-throwing NoNodeException but given that this is special case, I think we should be good, we can comment here for better explanation.
WDYT @Apache9?

Apache9 · 2024-05-06T02:32:06Z

I am in favor of keeping patch like this, so that we don't have to keep calling listChildren until /hbase/meta-region-server gets created. I know you have valid concern about not re-throwing NoNodeException but given that this is special case, I think we should be good, we can comment here for better explanation. WDYT @Apache9?

I need to figure out that what we have fixed here is that we should keep calling listChildren util /hbase/meta-region-server gets created, no matter you add a null check or use an exception...

hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKWatcher.java

vincentpoon · 2024-05-06T02:41:26Z

Let me attempt to summarize the cases:

/hbase/meta-region-server exists - node is returned all the way ZKUtil -> ZKWatcher -> MetaRegionLocationCache
/hbase exists but not meta-region-server child - empty list returned all the way to MetaRegionLocationCache, which proceeds without retry and waits for watcher notifications
/hbase does not exist. Currently returns null from ZKUtil, empty list from ZKWatcher, and MetaRegionLocationCache waits forever without watcher set. I am proposing throwing here so MetaRegionLocationCache retries for this case.

…t watcher to populate meta location

virajjasani

+1

Apache-HBase · 2024-05-06T03:09:18Z

🎊 +1 overall

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Apache-HBase · 2024-05-06T03:09:51Z

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Apache-HBase · 2024-05-06T03:10:43Z

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Apache-HBase · 2024-05-06T03:10:58Z

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…t watcher to populate meta location (#5874) Signed-off-by: Duo Zhang <zhangduo@apache.org> Signed-off-by: Viraj Jasani <vjasani@apache.org> (cherry picked from commit ce113dd)

…t watcher to populate meta location (apache#5874) Signed-off-by: Duo Zhang <zhangduo@apache.org> Signed-off-by: Viraj Jasani <vjasani@apache.org>

vincentpoon mentioned this pull request May 6, 2024

Update to Phoenix 5.2.0 and HBase 2.5 trinodb/trino#21569

Merged

virajjasani self-requested a review May 6, 2024 01:13

Apache9 reviewed May 6, 2024

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hbase-zookeeper/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKWatcher.java Show resolved Hide resolved

HBASE-28567 Race condition causes MetaRegionLocationCache to never se…

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…t watcher to populate meta location

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HBASE-28567 Race condition causes MetaRegionLocationCache to never se… #5874

HBASE-28567 Race condition causes MetaRegionLocationCache to never se… #5874

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