Asynchronously clean up obsolete HTLC info from DB #2705

t-bast · 2023-07-04T13:32:07Z

When a channel is closed, we can forget the data from historical HTLCs sent and received through that channel (which is otherwise required to punish cheating attempts by our peer). When a splice transaction confirms, we can also forget the data from revoked commitment transactions that cannot be published anymore.

We previously synchronously removed that data from the DB when a closing transaction confirmed. However, this could create performance issues as the htlc_infos table can be very large for busy nodes and many concurrent writes may be happening at the same time.

We don't need to get rid of this data immediately: we only want to remove it to avoid degrading the performance of active channels that read and write to the htlc_infos table. We now mark channels as closed in a dedicated table, and run a background actor that deletes batches of obsolete htlc data at regular intervals. This ensures that the table is eventually cleaned up, without impacting the performance of active channels.

⚠️ This is very sensitive code: if we end up removing data for a commitment that our peer may still publish, we can lose funds. Please carefully review this change, especially the last commit!

Fixes #2610, #2702 and #2740

codecov-commenter · 2023-07-04T13:57:34Z

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (c37df26) 85.85% compared to head (ce50751) 85.94%.
Report is 7 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2705      +/-   ##
==========================================
+ Coverage   85.85%   85.94%   +0.09%     
==========================================
  Files         216      218       +2     
  Lines       18201    18410     +209     
  Branches      749      767      +18     
==========================================
+ Hits        15626    15823     +197     
- Misses       2575     2587      +12

Files	Coverage Δ
...re/src/main/scala/fr/acinq/eclair/NodeParams.scala	`93.47% <100.00%> (+0.08%)`	⬆️
...in/scala/fr/acinq/eclair/channel/Commitments.scala	`97.01% <100.00%> (+0.19%)`	⬆️
...q/eclair/channel/fsm/ChannelOpenSingleFunded.scala	`93.52% <100.00%> (+0.05%)`	⬆️
...inq/eclair/channel/fsm/CommonFundingHandlers.scala	`91.11% <100.00%> (+0.41%)`	⬆️
...inq/eclair/channel/fund/InteractiveTxBuilder.scala	`91.37% <100.00%> (ø)`
...src/main/scala/fr/acinq/eclair/crypto/Sphinx.scala	`100.00% <100.00%> (ø)`
...main/scala/fr/acinq/eclair/db/DbEventHandler.scala	`93.58% <100.00%> (+0.08%)`	⬆️
...la/fr/acinq/eclair/db/RevokedHtlcInfoCleaner.scala	`100.00% <100.00%> (ø)`
...ain/scala/fr/acinq/eclair/db/pg/PgChannelsDb.scala	`99.39% <100.00%> (+0.11%)`	⬆️
...scala/fr/acinq/eclair/payment/send/Recipient.scala	`98.63% <100.00%> (+0.10%)`	⬆️
... and 8 more

... and 16 files with indirect coverage changes

n1bor · 2023-07-18T13:57:04Z

+1 happened to me again - it can stop the node even - as can get the whole connection pool full of sessions doing the delete then the lease renewal fails and then eclair shuts down.

n1bor · 2023-07-18T14:01:03Z

I think the interval could be much smaller e.g. 5 seconds. All that is important is that:

only one connection pool connection is tied up doing these delete.
the deletes do not timeout.

Or leave at 5mins - and if the last run deleted some rows schedule to run again right away.

Although this will delete 14million a day so should keep up!

t-bast · 2023-07-23T17:45:03Z

I think the interval could be much smaller e.g. 5 seconds.

There's no "good" default value that fits all since every node has a very different usage pattern here, but 5 seconds is most likely way too aggressive for a default value.

You should change the default for your specific node to match your usage, feel free to use 5 seconds if that's what makes sense for you.

n1bor · 2023-07-25T16:45:21Z

Do you really need this extra table?
What is wrong with:
delete from local.htlc_infos WHERE channel_id not in (select distinct channel_id from local.channels where not is_closed) limit XXX
And just run that once an hour (or day) - and if it deletes anything run again till nothing deleted.

I think it should be very efficient if nothing to delete as will only be 1000's of channel ids to check.

Also - was thinking - actually the real bug is that the lease renewal / check process shares the same connection pool as the rest of the app - this is what causes the crash. Should that not be on it's own connection - as might be other scenarios in which it gets starved of a connection from the pool and causes eclair to exit?

t-bast · 2023-07-26T07:35:33Z

delete from local.htlc_infos WHERE channel_id not in (select distinct channel_id from local.channels where not is_closed) limit XXX

This would be very inefficient. The select clause will require iterating through the whole local.channels table (even if you only keep the non closed channels, you have to scan all of them to know which ones aren't closed). I've actually ran some tests and tried this approach initially, but it's not good enough.

Also - was thinking - actually the real bug is that the lease renewal / check process shares the same connection pool as the rest of the app - this is what causes the crash. Should that not be on it's own connection - as might be other scenarios in which it gets starved of a connection from the pool and causes eclair to exit?

I don't think so. We should generally make sure all DB operations are fast, because they are synchronous operations. If they're all fast enough, we don't need to introduce any unnecessary complexity around the lease renewal process. Also, what you suggest only applies to postgres, while the current fix also handles sqlite.

n1bor · 2023-07-26T08:09:26Z

I think the optimiser is smarter than that - I think it will get the list of distinct channel_ids from the htlc_infos and channels tables, union that to find the channel_ids that should be deleted - then scan the index on htlc_infos.channel_ids to find the rows to delete if there are any. (Or at least I know the SAP ASE optimiser would - have a lot less experience with postgres optimiser). And in the normal case of nothing to delete - will then be very fast as is just union'ing 2 lists of a few 1000 numbers.

Will try to do a test later with analyse to see...

t-bast · 2023-07-26T08:15:24Z

This simply cannot be more efficient than a dedicated table, because you'll be fetching information from a much larger table.
Also, this means you will unnecessarily run the clean-up job even when you have nothing to clean-up, which is inefficient.
With a dedicated table, you instantly know whether you have things to clean-up or not.

n1bor · 2023-08-01T21:41:20Z

Seems you are correct - postgres can not to "Loose indexscan" so does a complete table scan even when there is an index on the column. So takes 1min on my 250m row table.
With a hacked together index scan runs in 0.8 secs - so is fine - but SQL is very nasty - not sure I really understand how it works!
https://wiki.postgresql.org/wiki/Loose_indexscan

Surprised this is missing as the delete we are trying to run is very common use-case in a relational database where your are deleting data from master and related tables..

rorp · 2023-08-02T16:10:27Z

Also - was thinking - actually the real bug is that the lease renewal / check process shares the same connection pool as the rest of the app - this is what causes the crash. Should that not be on it's own connection - as might be other scenarios in which it gets starved of a connection from the pool and causes eclair to exit?

If you are not going to migrate your node to another box any time soon, you can set

eclair.db.postgres.lock-type = none

That lease stuff is just a safeguard against user errors to prevent possible funds loss if multiple instances of Eclair start updating same channels in parallel. You don't have to use it all the time, though.

Also, it seems to me it's safe to replace withLock with inTransaction here https://github.com/ACINQ/eclair/pull/2705/files#diff-89b3a9b451c9cd791fcf1ad2ad18309d3cfd607e90e12b1894226b445b500ca0R252, because the relevant funds are already on chain. It's even desirable to delete all those HTLCs in a distributed setting :)

One more thought about the safeguards. In addition to lease we can generate Postgres user name based on a unique identifier of the machine, like a hash of the MAC address eg. eclair-d4671ae9, so that the DBA will have to manually grant/revoke access for those users. That can add additional protection when lease is turned off.

pm47

How about a stateless:

DELETE FROM local.htlc_infos
WHERE channel_id IN (
  SELECT channel_id FROM local.channels WHERE is_closed
)

And how about running this cleaning task once at startup (with a way to disable it) instead of periodically, so we don't have unpredictable performance hits on the database?

t-bast · 2023-09-26T09:00:21Z

And how about running this cleaning task once at startup (with a way to disable it) instead of periodically, so we don't have unpredictable performance hits on the database?

That wouldn't fix the issue we're trying to fix, which is that if there is too much to delete, it will timeout and we'll never be able to complete that deletion...

Also, I need to investigate it in more details, but that mechanism should be quite helpful for #2740: I'll spend some time working on this to add support for fixing #2740 in this PR and will see if that works well.

pm47 · 2023-09-26T09:21:51Z

That wouldn't fix the issue we're trying to fix, which is that if there is too much to delete, it will timeout and we'll never be able to complete that deletion...

Right, and we can tune the batch size to limit the impact on the database 👍

t-bast · 2023-09-28T13:41:17Z

I took this opportunity to also fix #2740, to make sure we only needed to update the DB versions once. I rebased so the commit history contains:

a first commit that introduces asynchronous clean-up for closed channels (which was previously reviewed)
a second commit that slightly changes the data model to also perform some clean-up on splice transaction confirmation

This is highly sensitive code, as deleting the wrong data can lead to loss of funds: please review very carefully!

remyers

The PR looks good to me! I just had a few questions and suggestions.

eclair-core/src/main/scala/fr/acinq/eclair/db/pg/PgChannelsDb.scala

eclair-core/src/test/scala/fr/acinq/eclair/channel/states/e/NormalSplicesStateSpec.scala

eclair-core/src/test/scala/fr/acinq/eclair/db/ChannelsDbSpec.scala

eclair-core/src/main/scala/fr/acinq/eclair/wire/internal/channel/version4/ChannelCodecs4.scala

When a channel is closed, we can forget the data from historical HTLCs sent and received through that channel (which is otherwise required to punish cheating attempts by our peer). We previously synchronously removed that data from the DB when the closing transaction confirmed. However, this could create performance issues as the `htlc_infos` table can be very large for busy nodes and many concurrent writes may be happening at the same time. We don't need to get rid of this data immediately: we only want to remove it to avoid degrading the performance of active channels that read and write to the `htlc_infos` table. We now mark channels as closed in a dedicated table, and run a background actor that deletes batches of obsolete htlc data at regular intervals. This ensures that the table is eventually cleaned up, without impacting the performance of active channels. Fixes #2610 and #2702

When a splice transaction confirms, all the revoked commitment transactions that only applied to the previous funding transaction cannot be published anymore, because the previous funding output has already been spent. We can thus forget all the historical HTLCs that were included in those commitments, because we will never need to generate the corresponding penalty transactions. This ensures that the growth of our DB is bounded, and will shrink every time a splice transaction is confirmed. Fixes #2740

- use `forgetHtlcInfo` to avoid code duplication - test exact number of DB entries cleaned up - use commitment index mismatch in splice test

t-bast · 2024-01-18T13:02:59Z

Rebased.

remyers

Rebase looks good to me!

eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelData.scala

While it requires more duplication in the codecs, because we didn't version the commitments codec, it is cleaner to have this filed in the commitment instead of having it in the funding status.

remyers · 2024-02-14T08:53:57Z

What's the semantic difference between WatchFundingConfirmed and WatchFundingDeeplyBuried? Is WatchFundingConfirmed supposed to be triggered when the funding tx is buried deeply enough that it can not be removed by a short reorg?

Perhaps we should only clean up htlcs when funding txs are "deeply buried" to prevent a situation where a short reorg creates a window when our peer could publish a revoked commitment we no longer have htlc info for. It seems like this could occur when we are the funding initiator for a splice and wait for only a default minDepthFunder of 1 block. Am I missing something?

Edit: It looks like minDepthScaled will scale the minDepth of dual funding txs to prevent the risk of reorgs. NB: we should schedule a decrease of references to 6.25 to 3.125 soon. :-)

Edit2: minDepthScaled will not scale channels of "small amounts" less than 16777216 sats, but that has become a significant amount of value today.

t-bast · 2024-02-14T09:14:11Z

Perhaps we should only clean up htlcs when funding txs are "deeply buried" to prevent a situation where a short reorg creates a window when our peer could publish a revoked commitment we no longer have htlc info for.

This is a good point, we must ensure we have enough confirmations before cleaning up the revoked states. We cannot use WatchFundingDeeplyBuried as-is because it is only used for the initial channel open, in order to send channel_announcement. The number of confirmations we use for WatchFundingConfirmed is always at least 3, and scaled based on the channel size. At that point we prune the older funding transactions and the corresponding commitments (

eclair/eclair-core/src/main/scala/fr/acinq/eclair/channel/Commitments.scala

Line 1233 in 599f9af

private def pruneCommitments()(implicit log: LoggingAdapter): Commitments = {

) so we wouldn't be able to react to a pruned revoked commitment anyway.

If we feel that 3 confirmations isn't enough, that's a parameter that can already be increased in eclair.conf!

It seems like this could occur when we are the funding initiator for a splice and wait for only a default minDepthFunder of 1 block.

I don't see when that can happen, can you point me to that code?

remyers · 2024-02-14T09:33:05Z

If we feel that 3 confirmations isn't enough, that's a parameter that can already be increased in eclair.conf!

It seems like this could occur when we are the funding initiator for a splice and wait for only a default minDepthFunder of 1 block.

I don't see when that can happen, can you point me to that code?

My mistake, it appears only singleFundingMinDepth can result in a 1 block min depth. It does seem like 3 should be enough.

remyers

LGTM!

pm47

LGTM, just some bikeshedding.

eclair-core/src/main/scala/fr/acinq/eclair/channel/fsm/CommonFundingHandlers.scala

eclair-core/src/main/scala/fr/acinq/eclair/db/ChannelsDb.scala

eclair-core/src/main/scala/fr/acinq/eclair/db/pg/PgChannelsDb.scala

fishcakeday · 2024-02-15T13:10:22Z

When I tried to run the latest git commit that included this patch, I ran into issues with channels DB version. It doesn't seem that migration ran, or I might have missed something.

2024-02-15 07:40:42,275 INFO  fr.acinq.eclair.Setup - connecting to database with instanceId=219fc9f9-a46b-4683-ba4d-69a570896297
2024-02-15 07:40:42,314 WARN  c.z.hikari.HikariConfig - HikariPool-1 - idleTimeout has been set but has no effect because the pool is operating as a fixed size pool.
2024-02-15 07:40:42,321 INFO  c.z.h.HikariDataSource - HikariPool-1 - Starting...
2024-02-15 07:40:42,502 INFO  c.z.h.HikariDataSource - HikariPool-1 - Start completed.
2024-02-15 07:40:43,764 ERROR fr.acinq.eclair.Boot - fatal error: Unknown version of DB channels found, version=8java.lang.RuntimeException: Unknown version of DB channels found, version=8
        at fr.acinq.eclair.db.pg.PgChannelsDb.$anonfun$new$2(PgChannelsDb.scala:157)
        at fr.acinq.eclair.db.pg.PgChannelsDb.$anonfun$new$2$adapted(PgChannelsDb.scala:51)
        at fr.acinq.eclair.db.jdbc.JdbcUtils.using(JdbcUtils.scala:52)
        at fr.acinq.eclair.db.jdbc.JdbcUtils.using$(JdbcUtils.scala:48)
        at fr.acinq.eclair.db.pg.PgUtils$.using(PgUtils.scala:33)
        at fr.acinq.eclair.db.pg.PgChannelsDb.$anonfun$new$1(PgChannelsDb.scala:51)
        at fr.acinq.eclair.db.pg.PgChannelsDb.$anonfun$new$1$adapted(PgChannelsDb.scala:50)
        at fr.acinq.eclair.db.pg.PgUtils$.inTransactionInternal(PgUtils.scala:265)
        at fr.acinq.eclair.db.pg.PgUtils$.$anonfun$inTransaction$1(PgUtils.scala:280)
        at fr.acinq.eclair.db.jdbc.JdbcUtils.withConnection(JdbcUtils.scala:37)
        at fr.acinq.eclair.db.jdbc.JdbcUtils.withConnection$(JdbcUtils.scala:34)
        at fr.acinq.eclair.db.pg.PgUtils$.withConnection(PgUtils.scala:33)
        at fr.acinq.eclair.db.pg.PgUtils$.inTransaction(PgUtils.scala:279)
        at fr.acinq.eclair.db.pg.PgChannelsDb.<init>(PgChannelsDb.scala:50)
        at fr.acinq.eclair.db.Databases$PostgresDatabases$.apply(Databases.scala:153)
        at fr.acinq.eclair.db.Databases$.postgres(Databases.scala:354)
        at fr.acinq.eclair.db.Databases$.init(Databases.scala:274)
        at fr.acinq.eclair.Setup.<init>(Setup.scala:204)
        at fr.acinq.eclair.Boot$.delayedEndpoint$fr$acinq$eclair$Boot$1(Boot.scala:44)
        at fr.acinq.eclair.Boot$delayedInit$body.apply(Boot.scala:34)
        at scala.Function0.apply$mcV$sp(Function0.scala:42)
        at scala.Function0.apply$mcV$sp$(Function0.scala:42)
        at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:17)
        at scala.App.$anonfun$main$1(App.scala:98)

2024-02-15 07:40:43,774 INFO  a.a.CoordinatedShutdown - Running CoordinatedShutdown with reason [JvmExitReason]
2024-02-15 07:40:43,789 INFO  f.a.eclair.db.Databases - cancelling the pg lock renew task...
2024-02-15 07:40:43,790 INFO  f.a.eclair.db.Databases - releasing the curent pg lock...
2024-02-15 07:40:46,812 INFO  f.a.eclair.db.Databases - closing the connection pool...
2024-02-15 07:40:46,813 INFO  c.z.h.HikariDataSource - HikariPool-1 - Shutdown initiated...
2024-02-15 07:40:46,832 INFO  c.z.h.HikariDataSource - HikariPool-1 - Shutdown completed.

pm47 · 2024-02-15T13:33:03Z

I ran into issues with channels DB version. It doesn't seem that migration ran

Thanks for reporting, fixed in #2824.

@fishcakeday

) Fixes a regression caused by #2705 reported by @fishcakeday.

t-bast requested a review from pm47 July 4, 2023 13:32

t-bast force-pushed the asynchronous-htlc-info-clean-up branch from df48b89 to b22d899 Compare July 4, 2023 13:33

t-bast mentioned this pull request Sep 8, 2023

Clean up htlc_infos after a splice confirms #2740

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t-bast force-pushed the asynchronous-htlc-info-clean-up branch from b22d899 to efd305f Compare September 21, 2023 14:58

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t-bast dismissed pm47’s stale review via b483c25 September 28, 2023 13:33

t-bast force-pushed the asynchronous-htlc-info-clean-up branch from efd305f to b483c25 Compare September 28, 2023 13:33

t-bast requested review from remyers and pm47 September 28, 2023 13:41

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t-bast force-pushed the asynchronous-htlc-info-clean-up branch from b483c25 to 125eafc Compare October 4, 2023 12:39

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t-bast dismissed remyers’s stale review via dbeaaab November 10, 2023 10:56

t-bast force-pushed the asynchronous-htlc-info-clean-up branch from 125eafc to dbeaaab Compare November 10, 2023 10:56

t-bast force-pushed the asynchronous-htlc-info-clean-up branch from dbeaaab to 53dd2a0 Compare November 23, 2023 15:12

t-bast added 2 commits January 18, 2024 14:02

Fix PR comments

d5f4e5d

- use `forgetHtlcInfo` to avoid code duplication - test exact number of DB entries cleaned up - use commitment index mismatch in splice test

t-bast force-pushed the asynchronous-htlc-info-clean-up branch from 53dd2a0 to d5f4e5d Compare January 18, 2024 13:02

remyers previously approved these changes Jan 18, 2024

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pm47 reviewed Feb 13, 2024

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eclair-core/src/main/scala/fr/acinq/eclair/channel/ChannelData.scala Outdated Show resolved Hide resolved

Move firstRemoteCommitIndex to Commitment

bc07548

While it requires more duplication in the codecs, because we didn't version the commitments codec, it is cleaner to have this filed in the commitment instead of having it in the funding status.

t-bast dismissed remyers’s stale review via bc07548 February 14, 2024 08:37

t-bast requested a review from pm47 February 14, 2024 08:38

remyers previously approved these changes Feb 14, 2024

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pm47 reviewed Feb 14, 2024

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Small refactoring

ce50751

t-bast dismissed remyers’s stale review via ce50751 February 14, 2024 12:50

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t-bast merged commit f41bd22 into master Feb 14, 2024
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t-bast deleted the asynchronous-htlc-info-clean-up branch February 14, 2024 13:06

t-bast mentioned this pull request Feb 14, 2024

Closing too many channels simultaneously can kill the node #2702

Closed

pm47 mentioned this pull request Feb 15, 2024

Make db migration code less footgunny #2823

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pm47 added a commit that referenced this pull request Feb 15, 2024

fixup! Asynchronously clean up obsolete HTLC info from DB (#2705)

1b1fc9b

pm47 mentioned this pull request Feb 15, 2024

fixup! Asynchronously clean up obsolete HTLC info from DB (#2705) #2824

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pm47 added a commit that referenced this pull request Feb 15, 2024

fixup! Asynchronously clean up obsolete HTLC info from DB (#2705) (#2824

62b739a

) Fixes a regression caused by #2705 reported by @fishcakeday.

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