Slot migration improvement #245

PingXie · 2024-04-06T19:52:16Z

Overview

This PR significantly enhances the reliability and automation of the Valkey cluster re-sharding process, specifically during slot migrations in the face of primary failures. These updates address critical failure issues that previously required extensive manual intervention and could lead to data loss or inconsistent cluster states.

Enhancements

Automatic Failover Support in Empty Shards

The cluster now supports automatic failover in shards that do not own any slots, which is common during scaling operations. This improvement ensures high availability and resilience from the outset of shard expansion.

Replication of Slot Migration States

All CLUSTER SETSLOT commands are now initially executed on replica nodes before the primary. This ensures that the slot migration state is consistent within the shard, preventing state loss in the event of primary failure. A new timeout parameter has been introduced, allowing users to specify the duration in milliseconds to wait for replication to complete, with a default set at 2 seconds.

CLUSTER SETSLOT slot { IMPORTING node-id | MIGRATING node-id | NODE node-id | STABLE } [ TIMEOUT timeout ]

Recovery of Logical Migration Links

The update automatically repairs the logical links between source and target nodes during failovers. This ensures that requests are correctly redirected to the new primary in the target shard after a primary failure, maintaining cluster integrity.

Enhanced Support for New Replicas

New replicas added to shards involved in slot migrations will now automatically inherit the slot's migration state as part of their initialization. This ensures that new replicas are immediately consistent with the rest of the shard.

Improved Logging for Slot Migrations

Additional logging has been implemented to provide operators with clearer insights into the slot migration processes and automatic recovery actions, aiding in monitoring and troubleshooting.

Additional Changes

cluster-allow-replica-migration

When cluster-allow-replica-migration is disabled, primary nodes that lose their last slot to another shard will no longer automatically become replicas of the receiving shard. Instead, they will remain in their own shards, which will now be empty, having no slots assigned to them.

Fix #21

codecov · 2024-04-20T20:41:16Z

Codecov Report

Attention: Patch coverage is 82.82443% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 68.89%. Comparing base (93f8a19) to head (6f459da).

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #245      +/-   ##
============================================
+ Coverage     68.43%   68.89%   +0.45%     
============================================
  Files           109      109              
  Lines         61681    61785     +104     
============================================
+ Hits          42214    42566     +352     
+ Misses        19467    19219     -248

Files	Coverage Δ
src/commands.def	`100.00% <ø> (ø)`
src/debug.c	`53.47% <100.00%> (+0.65%)`	⬆️
src/networking.c	`85.08% <100.00%> (ø)`
src/rdb.c	`75.79% <100.00%> (-0.47%)`	⬇️
src/replication.c	`86.33% <100.00%> (+0.03%)`	⬆️
src/server.c	`88.60% <100.00%> (+0.47%)`	⬆️
src/blocked.c	`91.80% <91.66%> (-0.06%)`	⬇️
src/cluster_legacy.c	`83.22% <81.11%> (+8.53%)`	⬆️

... and 10 files with indirect coverage changes

PingXie · 2024-04-22T17:25:30Z

@valkey-io/core-team ready for your review

zuiderkwast · 2024-04-22T21:52:21Z

@PingXie I updated the PR description. Please check if it's correct and edit again if it's not.

zuiderkwast

Partial review. (I've already reviewed it earlier and approved it, but it's long ago.)

src/valkey-cli.c

valkey.conf

PingXie · 2024-04-23T03:57:29Z

I think my previous fix (redis/redis#13055) introduced a race condition. More specifically, I don't think it is a good idea to move the slots on L3015, Instead, I should've always routed the topology update through clusterUpdateSlotsConfigWith. As a result, the logic attempting to fix the import source during a source primary failover is bypassed if the old primary (new replica's) PONG message races ahead of the new primary (old replica)'s.

@PingXie I updated the PR description. Please check if it's correct and edit again if it's not.

Thanks @zuiderkwast! I will write the proper PR description next.

src/cluster_legacy.c

zuiderkwast · 2024-04-28T03:05:41Z

Two commits need sign off. They're called "Update src/valkey-cli.c".

PingXie · 2024-04-28T04:33:40Z

I think my previous fix (redis/redis#13055) introduced a race condition. More specifically, I don't think it is a good idea to move the slots on L3015, Instead, I should've always routed the topology update through clusterUpdateSlotsConfigWith. As a result, the logic attempting to fix the import source during a source primary failover is bypassed if the old primary (new replica's) PONG message races ahead of the new primary (old replica)'s.

This should now be fixed. I don't think we need to backport the change to Valkey 7.2. The original fix should still work. It is just that the new reliability improvements in this PR require all topology updates be done in clusterUpdateSlotsConfigWith.

Next step is to (re)introduce the server-initiate wait and get rid of the REPLICAONLY flag.

Signed-off-by: Ping Xie <pingxie@google.com>

Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Signed-off-by: Ping Xie <pingxie@google.com>

Signed-off-by: Ping Xie <pingxie@google.com>

…nction Signed-off-by: Ping Xie <pingxie@google.com>

Signed-off-by: Ping Xie <pingxie@google.com>

`CLUSTER SETSLOT NODE` Signed-off-by: Ping Xie <pingxie@google.com>

hpatro

Mostly nit-picks. Pretty difficult to wrap my head around these complex conditions around slot ownership. Will re-read the code few times :D.

We should apply the formatting (planned to be added) on the new code changes. I see parantheses opening, spacing after , different from expected in few places.
We are using primary/replica in certain place(s) and master/slave terminology in few place(s) in code comments. Maybe just use primary/replica.

src/blocked.c

src/cluster_legacy.c

.gitignore

src/cluster_legacy.c

src/replication.c

src/cluster_legacy.c

PingXie · 2024-04-30T03:34:51Z

Thanks for the review, @hpatro. There is definitely inconsistency in this PR as it has gone through too many rounds of refactoring. I will clean up the naming and comments as part of the timeout enhancement but I will leave the coding style and terminology (primary/replica) to separate PRs which I plan to address across the entire codebase.

src/cluster_legacy.c

PingXie · 2024-04-30T22:03:07Z

Quick poll on the new timeout parameter.

We talked about allowing the client to control the wait time (with a default of 5s) on a per command basis for "CLUSTER SETSLOT", which now pre-replicates the command to the replicas first. QThis new parameter can only be added to the end of the command to maintain backward compat. I think a cleaner change would be introducing a "timeout" token such as "timeout 1000" but looks like this is not a pattern used in existing commands like "WAIT" where the timeout parameter is expected to be at a fixed location. Thoughts?

hpatro · 2024-04-30T22:20:57Z

For newer commands e.g. https://valkey.io/commands/xread/, we went with what you're suggesting above i.e. first the keyword and then followed by the actual value. The parsing logic becomes a slightly more complex but gives more flexibility. I think it's reasonable to proceed with your suggestion.

Signed-off-by: Ping Xie <pingxie@google.com> Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech>

Initial PR to add a governance doc outlining permissions for the main Valkey project as well as define responsibilities for sub-projects. --------- Signed-off-by: Madelyn Olson <madelyneolson@gmail.com> Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Co-authored-by: Ping Xie <pingxie@outlook.com> Co-authored-by: zhaozhao.zz <zhaozhao.zz@alibaba-inc.com> Co-authored-by: hwware <wen.hui.ware@gmail.com> Co-authored-by: binyan <binbin.yan@nokia.com

Fix the mem_freed variable to be initialized with init. with this PR prevents the variable from acting unknowingly. Signed-off-by: NAM UK KIM <namuk2004@naver.com>

Delete unused declaration `void *dictEntryMetadata(dictEntry *de);` in dict.h. --------- Signed-off-by: Lipeng Zhu <lipeng.zhu@intel.com>

Serverassert is a drop-in replacement of assert. We use it even in code copied from other sources. To make these files usable outside of Valkey, it should be enough to replace the `serverassert.h` include with `<assert.h>`. Therefore, this file shouldn't have any dependencies to the rest of the valkey code. --------- Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech>

Improve the performance of crc64 for large batches by processing large number of bytes in parallel and combining the results. ## Performance * 53-73% faster on Xeon 2670 v0 @ 2.6ghz * 2-2.5x faster on Core i3 8130U @ 2.2 ghz * 1.6-2.46 bytes/cycle on i3 8130U * likely >2x faster than crcspeed on newer CPUs with more resources than a 2012-era Xeon 2670 * crc64 combine function runs in <50 nanoseconds typical with vector + cache optimizations (~8 *microseconds* without vector optimizations, ~80 *microseconds without cache, the combination is extra effective) * still single-threaded * valkey-server test crc64 --help (requires `make distclean && make SERVER_TEST=yes`) --------- Signed-off-by: Josiah Carlson <josiah.carlson@gmail.com> Signed-off-by: Madelyn Olson <madelyneolson@gmail.com> Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Co-authored-by: Madelyn Olson <madelyneolson@gmail.com>

…of-rewrite (valkey-io#393) Renamed redis to valkey/server in aof.c serverlogs. The AOF rewrite child process title is set to "redis-aof-rewrite" if Valkey was started from a redis-server symlink, otherwise to "valkey-aof-rewrite". This is a breaking changes since logs are changed. Part of valkey-io#207. --------- Signed-off-by: Shivshankar-Reddy <shiva.sheri.github@gmail.com>

This is a minor change where only naming and links now points properly to valkey. Fixes valkey-io#388 --------- Signed-off-by: Rolandas Šimkus <rolandas@simkus.io> Signed-off-by: simkusr <rolandas.s@wilibox.com> Signed-off-by: simkusr <rolandas@simkus.io> Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Co-authored-by: simkusr <rolandas.s@wilibox.com> Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech>

These JSON files were originally not intended to be used directly, since they contain internals and some fiels like "acl_categories" that are not the final ACL categories. (Valkey will apply some implicit rules to compute the final ACL categories.) However, people see JSON files and use them directly anyway. So it's better to document them. In a later PR, we can get rid of all implicit ACL categories and instead populate them explicitly in the JSON files. Then, we'll add a validation (e.g. in generate-command-code.py) that the implied categories are set. --------- Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Co-authored-by: Binbin <binloveplay1314@qq.com>

Signed-off-by: Ikko Eltociear Ashimine <eltociear@gmail.com>

Signed-off-by: Ping Xie <pingxie@google.com>

madolson

Just tests left for review.

madolson · 2024-05-03T02:45:40Z

src/cluster_legacy.c

+                    /* We intentionally avoid updating myself's configEpoch when
+                    * taking ownership of this slot. This approach is effective
+                    * in scenarios where my primary crashed during the slot
+                    * finalization process. I became the new primary without
+                    * inheriting the slot ownership, while the source shard
+                    * continued and relinquished the slot.


I feel very uncomfortable about just breaking core assumptions about the algorithm here (specifically omitting the configEpoch). It really feels like we should be bumping the epoch here, even if it means we steal slots unnecessarily. (This is an edge case after all) We are explicitly prioritizing availability here.

I think it is equally incorrect, if not more, to bump the config epoch without going through consensus. The impact on availability is the same, bumping the epoch or not, because this node will assume the ownership of this slot. In this case, the more likely case will be what I explained in the comments that follow (copied below too)

* By not increasing myself's configEpoch, we ensure that * if the slot is correctly migrated to another primary, I * will not mistakenly claim ownership. Instead, any ownership * conflicts will be resolved accurately based on configEpoch * values. */

I think it is equally incorrect, if not more, to bump the config epoch without going through consensus.

This isn't true, there is nothing wrong with bumping the epoch without consensus. Consensus is the preferred way to do it to avoid unnecessary churn, but it's not a pre-requisite.

The impact on availability is the same, bumping the epoch or not, because this node will assume the ownership of this slot. In this case, the more likely case will be what I explained in the comments that follow (copied below too)

I agree, that is why I'm saying we should bump the epoch. There was a change to the slot ownership, that is supposed to come with an epoch bump.

This isn't true, there is nothing wrong with bumping the epoch without consensus. Consensus is the preferred way to do it to avoid unnecessary churn, but it's not a pre-requisite.

A primary case that I am trying to handle is where the node in question becomes a primary without knowing that the source shard has just given up its slot ownership to its old primary since the old primary just failed. For this node to become the new primary, it would have to go through an election and get its config epoch bumped already (with a consensus). However, it is also conceivable that the source shard might have given the slot to a different shard and it is in this case where I still think it is safer to not blindly bump the config epoch because it would undo the true indent; while in the primary failure case we don't need to bump the config epoch, because it is a side product of the failover.

Btw, in all existing cases where we bump the config epoch without consensus, we have a clear intent to take over the slot ownership and this is the key difference IMO.

Btw, in all existing cases where we bump the config epoch without consensus, we have a clear intent to take over the slot ownership and this is the key difference IMO.

You're prescribing intent to an algorithm. The epoch get's bumped every time the slot ownership is changed, because we are in a new-epoch with new state.

I still think it is safer to not blindly bump the config epoch because it would undo the true indent;

But you're okay with blindly serving data without true intent? I suppose that is my problem with this, either we are committing to the change with the epoch bump or we shouldn't be serving traffic.

src/cluster_legacy.c

tests/unit/cluster/slot-migration.tcl

madolson · 2024-05-03T03:18:44Z

tests/unit/cluster/slot-migration.tcl

+}
+
+# restart a server and wait for it to come back online
+proc restart_server_and_wait {server_id} {


Almost universally we de-schedule processes by using the pause helpers to trigger failovers. This does two things, one is that we don't have to restart the process manually later, and second is that it's similar to when a processes disappears for a bit so tests additional modes.

Is there a specific reason we are restarting here?

Almost universally we de-schedule processes by using the pause helpers to trigger failovers.

is this pause_process? it kills the process and a restart is needed too. or this is something else?

It just pauses the process, I was asking if we specifically need to kill it here?

I see. my intent is to simulate true failures. If I don't kill the server, I will have to use "graceful failover" to switch roles.

If the server is paused (SIGPAUSE), it doesn't respond to cluster messages and this leads to an automatic failover, in the same way as if the network were broken. I think simulates a true failure.

Yeah, the segfault seems to be causing more valgrind issues as well. I think we should re-evaluate this decision.

madolson · 2024-05-03T03:23:39Z

tests/unit/cluster/slot-migration.tcl

+        assert {$duration > 2000}
+
+        # Setslot should fail with not enough good replicas to write after the timeout
+        assert_equal {NOREPLICAS Not enough good replicas to write.} $e


Yeah, it's more weird behavior, but for now it seems acceptable.

Signed-off-by: Ping Xie <pingxie@google.com>

PingXie · 2024-05-03T04:41:05Z

Yeah, it's more weird behavior, but for now it seems acceptable.

I am not sure if I agree with the "more weird behavior" statement. There is actually a coherent story to tell/document here. The cluster setslot command is now pre-replicated to all replicas synchronously. If one or more replicas failed to acknowledge the command, returning "Not enough good replicas to write" seems very reasonable to me. I also don't want to introduce a specific error just for cluster setslot. Do you have a different error message in mind?

Signed-off-by: Ping Xie <pingxie@google.com>

PingXie · 2024-05-03T04:49:00Z

Yeah, it's more weird behavior, but for now it seems acceptable.

I am not sure if I agree with the "more weird behavior" statement. There is actually a coherent story to tell/document here. The cluster setslot command is now pre-replicated to all replicas synchronously. If one or more replicas failed to acknowledge the command, returning "Not enough good replicas to write" seems very reasonable to me. I also don't want to introduce a specific error just for cluster setslot. Do you have a different error message in mind?

Okay now I think this is "weird behavior" on the github side :). It apparently misplaced your comment and made it look like it was about the error message but after I clicked into the code, I saw that you were commenting about the "torn" states. Please ignore my response above.

zuiderkwast · 2024-05-03T09:26:38Z

tests/unit/cluster/slot-migration.tcl

+        wait_for_slot_state 7 "\[609-<-$R0_id\]"
+    }
+
+    test "Empty-shard migration target is auto-updated after faiover in target shard" {


How will valkey-cli behave if it's in the middle of transferring keys between the nodes when the failover happens? WIll it seamlessly continue and finish the slot after failover?

I'm starting to think that we could let a cron job could finish the (non-atomic) slot migration, i.e. transfer keys. Without valkey-cli involved, it might be easier to get a self-healing cluster.

If we introduce a command like CLUSTER MIGRATE slot TO node, initially with a simple non-atomic cron-driven implementation, then we can replace it with an atomic slot migration later. It won't be a breaking change (I think).

All good points and if you remember our discussion back in the Redis days these were all on my plan

Introduce "cluster migrate slot"

Have engine drive the migration in serverCron

Auto resume on failures

I also believe the same interface can be reused for atomic slot migration without causing breaks.

Let's file separate issues?

Yeah, incremental perfection. .)

For now, I just would like to know how this PR affects the documented valkey-cli-based flow. Can it resume a slot-migration? It quite possibly can. It'd just be good to test it.

For now, I just would like to know how this PR affects the documented valkey-cli-based flow. Can it resume a slot-migration? It quite possibly can. It'd just be good to test it.

From a quick look at clusterManagerMigrateKeysInSlot, it does not look like that valkey-cli would be able to resume on failovers. MIGRATE is a write command that can only be executed on the primary but I haven't seen valkey-cli rediscovering the topology in clusterManagerMigrateKeysInSlot?

No, --cluster fix maybe. If not, I think we should probably add something there to discover and resume an aborted migration.

Signed-off-by: Ping Xie <pingxie@google.com>

PingXie · 2024-05-07T00:16:43Z

Sorry I can't fix the DCO. Shouldn't have rebased. Closing this PR and moving changes to #445.

PingXie force-pushed the slot_migration branch from 620fd99 to a6891f4 Compare April 6, 2024 19:53

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PingXie and others added 9 commits April 28, 2024 21:09

Slot migration improvement

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Signed-off-by: Ping Xie <pingxie@google.com>

Add missing changes

03196a4

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Improve test reliability

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Update src/valkey-cli.c

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Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Signed-off-by: Ping Xie <pingxie@google.com>

Update src/valkey-cli.c

fac9a06

Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Signed-off-by: Ping Xie <pingxie@google.com>

Consolidate cluster topology update to clusterUpdateSlotsConfigWith

2d004b3

Signed-off-by: Ping Xie <pingxie@google.com>

Fix a typo and move gossip packet validation logic into a separate fu…

4cef2b4

…nction Signed-off-by: Ping Xie <pingxie@google.com>

Fix build builds and flaky tests

10944e6

Signed-off-by: Ping Xie <pingxie@google.com>

Reintroduce server-initiated wait and remove the REPLICAONLY flag for

907de8c

`CLUSTER SETSLOT NODE` Signed-off-by: Ping Xie <pingxie@google.com>

PingXie force-pushed the slot_migration branch from a475d1a to 907de8c Compare April 29, 2024 04:09

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Merge branch 'valkey-io:unstable' into slot_migration

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Update src/commands/cluster-setslot.json

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Signed-off-by: Ping Xie <pingxie@google.com> Co-authored-by: Viktor Söderqvist <viktor.soderqvist@est.tech>

Modify mem_freed variable in evict.c and Update debug.c (valkey-io#376)

f7e7339

Fix the mem_freed variable to be initialized with init. with this PR prevents the variable from acting unknowingly. Signed-off-by: NAM UK KIM <namuk2004@naver.com>

Delete unused declaration (valkey-io#400)

b6799bd

Delete unused declaration `void *dictEntryMetadata(dictEntry *de);` in dict.h. --------- Signed-off-by: Lipeng Zhu <lipeng.zhu@intel.com>

Fix typo in comment in quicklist.h (valkey-io#416)

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update commands.def

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Merge branch 'valkey-io:unstable' into slot_migration

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[NEW] Consolidate wait states #427

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Replicas should indicate their version to their Primaries during handshake #414

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Reintroduce a proper timeout to help stablize the cluster

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update code comment

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Bump the config epoch when taking over "orphaned" slots

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Merge branch 'valkey-io:unstable' into slot_migration

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[NEW] Server driven slot migration #587

Open

Slot migration improvement #245

Slot migration improvement #245

Conversation

PingXie commented Apr 6, 2024 • edited

Overview

Enhancements

Automatic Failover Support in Empty Shards

Replication of Slot Migration States

Recovery of Logical Migration Links

Enhanced Support for New Replicas

Improved Logging for Slot Migrations

Additional Changes

cluster-allow-replica-migration

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