blockstore: send duplicate proofs for chained merkle root conflicts #102

AshwinSekar · 2024-03-06T02:31:25Z

Problem
Chained merkle roots are not yet verified on the receiving node

Summary of Changes
Generate a duplicate proof if a block contains improperly chained merkle root.
Note: we do not generate a proof for FEC set 0 that chains from the last FEC set of the parent, as we are unsure which block is the duplicate. this decision is deferred until we see votes.

Contributes to solana-labs#34897

codecov-commenter · 2024-03-06T21:00:16Z

Codecov Report

Attention: Patch coverage is 98.46939% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 82.0%. Comparing base (ad94732) to head (4fbcee6).

Additional details and impacted files

@@           Coverage Diff            @@
##           master     #102    +/-   ##
========================================
  Coverage    81.9%    82.0%            
========================================
  Files         851      851            
  Lines      231132   231510   +378     
========================================
+ Hits       189484   189878   +394     
+ Misses      41648    41632    -16

AshwinSekar · 2024-03-15T03:06:44Z

stats are deceiving, ~900 lines are tests

behzadnouri · 2024-03-25T11:05:02Z

ledger/src/blockstore.rs

+            .next_back();
+        if let Some((candidate_erasure_set, candidate_erasure_meta)) = candidate_erasure_entry {
+            if candidate_erasure_meta.as_ref().next_set_index() == fec_set_index {


Might be shorter code to use Option::filter here.
https://doc.rust-lang.org/std/option/enum.Option.html#method.filter

behzadnouri · 2024-03-25T11:22:12Z

ledger/src/blockstore.rs

+            .iter(IteratorMode::From(
+                (slot, u64::from(fec_set_index)),


Any idea how efficient this IteratorMode::From is?
i.e. how does rocksdb seek until given starting point of iterator?

not sure, took a quick look at the source https://github.com/cockroachdb/c-rocksdb/blob/0dd42399d1f02019c982d1752beee2f145fdd2dd/internal/db/forward_iterator.cc#L286
and it looks like it has to check each file in order to find the starting point. it seems able to quickly skip files if the user key is greater than the largest element in that file.

i'll ask around for more details and get back to you.

Pretty sure it binary searches the tree of SST's: https://github.com/facebook/rocksdb/wiki/Indexing-SST-Files-for-Better-Lookup-Performance, and then each SST has can also be binary searched for the nearest key: https://github.com/facebook/rocksdb/wiki/A-Tutorial-of-RocksDB-SST-formats

behzadnouri · 2024-03-25T11:25:04Z

ledger/src/blockstore.rs

+        };
+        let candidate_erasure_meta: ErasureMeta = deserialize(candidate_erasure_meta.as_ref())?;
+        // Check if this is actually the consecutive erasure set
+        if candidate_slot == slot && candidate_erasure_meta.next_set_index() == fec_set_index {


shouldn't this check for candidate_slot == slot before deserialize so that it does not pay for a redundant deserialize?

behzadnouri · 2024-03-25T11:35:45Z

ledger/src/blockstore_meta.rs

+    pub(crate) fn next_set_index(&self) -> u32 {
+        u32::try_from(self.set_index)
+            .unwrap()
+            .saturating_add(self.config.num_data as u32)


Can this function return Option<u32> to avoid unwrap and checked_add instead of saturating_add?

Also, can we rename this function to next_fec_set_index for consistency?
We should probably also rename all the existing set_index to fec_set_index (separate PR).

behzadnouri · 2024-03-25T16:57:48Z

ledger/src/shred.rs

can we actually move all shred changes to a separate PR for easier review?

#435 split it out here

behzadnouri · 2024-03-25T17:01:21Z

ledger/src/shred.rs

@@ -726,6 +731,22 @@ pub mod layout {
        }
    }

+    pub fn get_chained_merkle_root(shred: &[u8]) -> Option<Hash> {


also pub(crate)?!

behzadnouri · 2024-03-25T17:05:46Z

ledger/src/shred/merkle.rs

@@ -193,6 +193,18 @@ impl ShredData {
        Ok(Self::SIZE_OF_HEADERS + Self::capacity(proof_size, /*chained:*/ true, resigned)?)
    }

+    fn get_chained_merkle_root_offset(proof_size: u8, resigned: bool) -> Result<usize, Error> {


if adding this function, then fn chained_merkle_root_offset should reuse it as opposed to duplicating that last line.

behzadnouri · 2024-03-25T17:10:18Z

ledger/src/shred/merkle.rs

@@ -364,7 +401,11 @@ impl ShredCode {
        Ok(Self::SIZE_OF_HEADERS + Self::capacity(proof_size, /*chained:*/ true, resigned)?)
    }

-    fn chained_merkle_root(&self) -> Result<Hash, Error> {
+    fn get_chained_merkle_root_offset(proof_size: u8, resigned: bool) -> Result<usize, Error> {


similarly here, fn chained_merkle_root_offset should call into this function instead of duplicating last line.

behzadnouri · 2024-03-25T17:14:47Z

ledger/src/shred/merkle.rs

+    pub(super) fn get_chained_merkle_root(
+        shred: &[u8],
+        proof_size: u8,
+        chained: bool,
+        resigned: bool,
+    ) -> Option<Hash> {
+        debug_assert_eq!(
+            shred::layout::get_shred_variant(shred).unwrap(),
+            ShredVariant::MerkleData {
+                proof_size,
+                chained,
+                resigned
+            }
+        );
+
+        if !chained {
+            return None;
+        }
+
+        let offset = Self::get_chained_merkle_root_offset(proof_size, resigned).ok()?;
+        shred
+            .get(offset..offset + SIZE_OF_MERKLE_ROOT)
+            .map(Hash::new)
+    }


I am wondering if we need this function at all, or instead in layout::get_chained_merkle_root just call the merkle::Shred{Data,Code}::get_chained_merke_root_offset and do the slicing there.

This function is a bit ugly, and layout::get_chained_merkle_root only needs the offset, so maybe better not to add this function.

behzadnouri · 2024-03-25T17:20:10Z

ledger/src/blockstore.rs

+        let mut new_merkle_root_meta = false;
+        merkle_root_metas.entry(erasure_set).or_insert_with(|| {
+            new_merkle_root_meta = true;
+            WorkingEntry::Dirty(MerkleRootMeta::from_shred(&shred))
+        });


I personally don't like this let mut ... + mutation pattern. It is much easier to make mistakes and introduce bugs with mutable variables. Instead

let new_merkle_root_meta = match merkle_root_metas.entry(erasure_set) { Entry::Vacant(entry) => { entry.insert(...); true }, Entry::Occupied(_) => false, }

behzadnouri · 2024-03-30T07:46:42Z

ledger/src/blockstore_meta.rs

+        u32::try_from(self.set_index)
+            .ok()
+            .and_then(|fec_set_index| fec_set_index.checked_add(self.config.num_data as u32))


can we avoid unsafe as in here? something like:

let num_data = u64::try_from(self.config.num_data).ok()?; self.set_index.checked_add(num_data).map(u32::try_from)?.ok()

behzadnouri · 2024-03-30T07:51:26Z

ledger/src/blockstore.rs

+                "Invalid erasure meta, unable to compute next fec set index {:?}",
+                erasure_meta


https://rust-lang.github.io/rust-clippy/master/index.html#/uninlined_format_args
also elsewhere in this code.

behzadnouri · 2024-03-30T07:53:04Z

ledger/src/blockstore.rs

+                candidate_erasure_meta
+                    .as_ref()
+                    .next_fec_set_index()
+                    .map(|next_fec_set_index| next_fec_set_index == fec_set_index)
+                    .unwrap_or(false)


Why do we need .as_ref() here?
Also this could just be

candidate_erasure_meta.next_fec_set_index() == Some(fec_set_index)

need the .as_ref() to convert the WorkingEntry<ErasureMeta> into an ErasureMeta

behzadnouri · 2024-03-30T08:01:19Z

ledger/src/blockstore.rs

+            // Blockstore is empty
+            return Ok(None);
+        };
+        if candidate_slot != slot {


Can this be just .filter after .find?

Also might be better not to define and use candidate_slot in line 553, since that is just slot.

behzadnouri · 2024-03-30T08:05:35Z

ledger/src/blockstore.rs

+        if next_fec_set_index == fec_set_index {
+            let candidate_erasure_set = ErasureSetId::new(
+                candidate_slot,
+                u32::try_from(candidate_fec_set_index).unwrap(),


might be worth to add a comment why unwrap is safe here.

behzadnouri · 2024-03-30T08:10:24Z

ledger/src/blockstore.rs

+                    .map(|entry| (entry, false))
+                    .unwrap_or_else(|| {
+                        (
+                            WorkingEntry::Dirty(ErasureMeta::from_coding_shred(&shred).unwrap()),
+                            true,
+                        )
+                    });
+                entry.insert(erasure_meta);


instead of false/true above, can't we just check if the output of entry.insert(erasure_meta) is clean or dirty?
it returns the inserted value:
https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.insert

nice, that's much cleaner

behzadnouri · 2024-03-30T08:13:46Z

ledger/src/blockstore.rs

+        let erasure_meta_entry = erasure_metas
+            .get(&erasure_set)
+            .expect("entry must exist after insertion above");


this double lookup seems also unnecessary and we can just use output of VacantEntry::insert:
https://doc.rust-lang.org/std/collections/btree_map/struct.VacantEntry.html#method.insert
and OccupiedEntry::into_mut:
https://doc.rust-lang.org/std/collections/btree_map/struct.OccupiedEntry.html#method.into_mut

behzadnouri · 2024-03-30T08:24:26Z

ledger/src/blockstore.rs

+        let is_new_merkle_root_meta = match merkle_root_metas.entry(erasure_set) {
+            HashMapEntry::Vacant(entry) => {
+                entry.insert(WorkingEntry::Dirty(MerkleRootMeta::from_shred(&shred)));
+                true
+            }
+            HashMapEntry::Occupied(_) => false,
+        };


I feel like this whole true/false bookkeeping of if this is a new erasure-meta/merkle-root or not pretty verbose and error prone.
Might be better if we just check for consistency when these entries are inserted into blockstore. I don't know how difficult that would be because we need to send a duplicate proof in that case.

If both erasure-meta/merkle-root structs in blockstore have a reference to the shred (type, index) which initially populated them, then we basically need a pipeline which receives shreds, obtains erasure-meta/merkle-root from them, upserts erasure-meta/merkle-root values in blockstore and if there are inconsistencies then generates and sends duplicate proofs.

i.e. separate out the process of persisting shreds into blockstore and erasure-meta/merkle-root consistency checks.

I think this should be possible. If we are able to add a reference to the initial shred for ErasureMeta (MerkleRootMeta already has it), then we could batch and perform all checks here:

agave/ledger/src/blockstore.rs

Lines 1035 to 1056 in 2c11b7a

for (erasure_set, working_erasure_meta) in erasure_metas {

if !working_erasure_meta.should_write() {

// No need to rewrite the column

continue;

}

let (slot, fec_set_index) = erasure_set.store_key();

write_batch.put::<cf::ErasureMeta>(

(slot, u64::from(fec_set_index)),

working_erasure_meta.as_ref(),

)?;

}

for (erasure_set, working_merkle_root_meta) in merkle_root_metas {

if !working_merkle_root_meta.should_write() {

// No need to rewrite the column

continue;

}

write_batch.put::<cf::MerkleRootMeta>(

erasure_set.store_key(),

working_merkle_root_meta.as_ref(),

)?;

}

which still has the plumbing to send duplicate proofs.

we could reuse the __unused_size field as an offset to the first received coding shred in ErasureMeta.
let me know if you prefer going with this approach.

Lets explore that idea in a separate PR and see how it looks like.
Current code has become very convoluted and risky to ship; so there might be better alternative designs.

to be clear would you like me to continue addressing comments and merge this pr? or move this to draft and explore the alternate approach in a separate pr?

I don't know. How do you feel like about that alternative implementation?
I am not sure which one would be simpler and less risky especially if we want to hit mainnet asap.

okay I updated this one and will explore how the alternative will look.
most of the helper functions will be the same, just moving the logic which performs the check to the blockstore write.

behzadnouri · 2024-04-06T14:38:50Z

ledger/src/blockstore.rs

+        &self,
+        erasure_set: ErasureSetId,
+        erasure_metas: &BTreeMap<ErasureSetId, WorkingEntry<ErasureMeta>>,
+    ) -> Result<Option<ErasureSetId>> {


Shouldn't this function actually return the ErasureMeta (which it already has during processing)?
I am guessing we will always need to look up the ErasureMeta from the returned ErasureSetId.

I actually don't need the erasure meta. I need the erasure set to look up the merkle root meta to access the merkle root for the comparison in check_backwards_chained_merkle_root_consistency.

behzadnouri · 2024-04-06T14:46:59Z

ledger/src/blockstore.rs

+        let Some(erasure_meta_entry) = erasure_metas.get(&erasure_set) else {
+            error!(
+                "Checking chained merkle root consistency on an erasure set {erasure_set:?}
+                that is not loaded in memory, programmer error",
+            );
+            return true;
+        };


shouldn't this be an expect?

behzadnouri · 2024-04-06T14:50:57Z

ledger/src/blockstore.rs

+        if let HashMapEntry::Vacant(entry) = merkle_root_metas.entry(next_erasure_set) {
+            if let Some(meta) = self.merkle_root_meta(next_erasure_set).unwrap() {
+                entry.insert(WorkingEntry::Clean(meta));
+            }
+        }
+        if let Some(next_merkle_root_meta) =
+            merkle_root_metas.get(&next_erasure_set).map(AsRef::as_ref)


can we avoid this double hash-map lookup here with a match expression?
similar to line 1328

behzadnouri · 2024-04-06T14:55:30Z

ledger/src/blockstore.rs

+        let Some(chained_merkle_root) = chained_merkle_root else {
+            // Chained merkle roots have not been enabled yet
+            return true;
+        };
+        if merkle_root == Some(chained_merkle_root) {
+            return true;
+        }
+        false


This is just equivalent to

chained_merkle_root.is_none() || chained_merkle_root == merkle_root

behzadnouri · 2024-04-06T15:01:15Z

ledger/src/blockstore.rs

+            // This can happen if the previous erasure meta was not consistent with the shred
+            // received. The merkle root meta is only created if the shred is inserted,
+            // however the erasure meta always exists.


I don't understand this;
When do we create and store erasure meta from the shred received, but do not store its merkle_root meta?
Can you plz point me to where that logic is in the code?

I think you're right, we should always be storing both

If the shred passes the preliminary checks, an erasure meta is created:

agave/ledger/src/blockstore.rs

Lines 1248 to 1255 in 5eab6ae

let erasure_meta_entry = erasure_metas.entry(erasure_set).or_insert_with(|| {

self.erasure_meta(erasure_set)

.expect("Expect database get to succeed")

.map(WorkingEntry::Clean)

.unwrap_or_else(|| {

WorkingEntry::Dirty(ErasureMeta::from_coding_shred(&shred).unwrap())

})

});

We then perform the following checks:

agave/ledger/src/blockstore.rs

Line 1258 in 5eab6ae

if !erasure_meta.check_coding_shred(&shred) {

agave/ledger/src/blockstore.rs

Lines 1307 to 1309 in 5eab6ae

let result = self

.insert_coding_shred(index_meta, &shred, write_batch)

.is_ok();

I had assumed (1) could fail, but looking at the code this seems impossible.

We finally insert the merkle meta if both checks succeed:

agave/ledger/src/blockstore.rs

Lines 1311 to 1318 in 5eab6ae

if result {

index_meta_working_set_entry.did_insert_occur = true;

metrics.num_inserted += 1;

merkle_root_metas

.entry(erasure_set)

.or_insert(WorkingEntry::Dirty(MerkleRootMeta::from_shred(&shred)));

}

I had previously guarded this because the merkle root meta has a reference to the first received shred and I didn't want to end up in scenarios where this reference is inconsistent with blockstore.

although it is unlikely, (2) could fail but then we probably have bigger issues.
So I think fine to just unwrap / expect here.

behzadnouri · 2024-04-06T15:03:07Z

ledger/src/blockstore.rs

+        let is_new_merkle_root_meta = match merkle_root_metas.entry(erasure_set) {
+            HashMapEntry::Vacant(entry) => {
+                entry.insert(WorkingEntry::Dirty(MerkleRootMeta::from_shred(&shred)));
+                true
+            }
+            HashMapEntry::Occupied(_) => false,
+        };


Lets explore that idea in a separate PR and see how it looks like.
Current code has become very convoluted and risky to ship; so there might be better alternative designs.

behzadnouri

lgtm, but I don't trust my own review here.
This code has become extremely ugly and convoluted, and I am not sure it is suitable for v1.18 backport given imminent mainnet upgrade.
We really need to redesign this pipeline into a more sane shape.

behzadnouri · 2024-04-10T17:20:41Z

ledger/src/blockstore.rs

+        let Some(next_fec_set_index) = candidate_erasure_meta.next_fec_set_index() else {
+            return Err(BlockstoreError::InvalidErasureConfig);
+        };
+        if next_fec_set_index == fec_set_index {


does it make sense to add candidate_erasure_meta to erasure_metas to avoid rocksdb search next time around?

AshwinSekar · 2024-04-10T17:43:00Z

lgtm, but I don't trust my own review here. This code has become extremely ugly and convoluted, and I am not sure it is suitable for v1.18 backport given imminent mainnet upgrade. We really need to redesign this pipeline into a more sane shape.

How about I split out the helper function previous_erasure_set and the checks check_forward/backwards_chained_merkle_root_consistency + tests into a separate PR since we will need to perform this check logic regardless of which approach we go with.

Then we can compare this method of plumbing, to the "check when writing to blockstore" approach and see what makes sense to backport.

behzadnouri · 2024-04-10T17:48:58Z

lgtm, but I don't trust my own review here. This code has become extremely ugly and convoluted, and I am not sure it is suitable for v1.18 backport given imminent mainnet upgrade. We really need to redesign this pipeline into a more sane shape.

How about I split out the helper function previous_erasure_set and the checks check_forward/backwards_chained_merkle_root_consistency + tests into a separate PR since we will need to perform this check logic regardless of which approach we go with.

Then we can compare this method of plumbing, to the "check when writing to blockstore" approach and see what makes sense to backport.

sounds good.

AshwinSekar · 2024-04-16T05:37:45Z

@behzadnouri i've added the alternate implementation here #835

AshwinSekar · 2024-04-22T14:48:17Z

closing in favor of #835

AshwinSekar force-pushed the chain-dup-proof branch 6 times, most recently from 2e5fd6f to 4712d7a Compare March 6, 2024 19:26

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AshwinSekar marked this pull request as ready for review March 15, 2024 03:02

AshwinSekar requested review from carllin and behzadnouri March 15, 2024 03:13

behzadnouri reviewed Mar 25, 2024

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AshwinSekar mentioned this pull request Mar 26, 2024

shred: expose chained merkle root #435

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mergify bot mentioned this pull request Mar 27, 2024

v1.18: shred: expose chained merkle root (backport of #435) #459

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AshwinSekar mentioned this pull request Apr 10, 2024

blockstore: scaffolding for chained merkle root conflict detection #719

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v1.18: blockstore: scaffolding for chained merkle root conflict detection (backport of #719) #729

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blockstore: send duplicate proofs for chained merkle root conflicts

4fbcee6

AshwinSekar force-pushed the chain-dup-proof branch from 4e01a31 to 4fbcee6 Compare April 11, 2024 21:33

AshwinSekar mentioned this pull request Apr 16, 2024

blockstore: send duplicate proofs for chained merkle root conflicts #835

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mergify bot mentioned this pull request Apr 23, 2024

v1.18: blockstore: send duplicate proofs for chained merkle root conflicts (backport of #835) #1009

Merged

		"Invalid erasure meta, unable to compute next fec set index {:?}",
		erasure_meta

	for (erasure_set, working_erasure_meta) in erasure_metas {
	if !working_erasure_meta.should_write() {
	// No need to rewrite the column
	continue;
	}
	let (slot, fec_set_index) = erasure_set.store_key();
	write_batch.put::<cf::ErasureMeta>(
	(slot, u64::from(fec_set_index)),
	working_erasure_meta.as_ref(),
	)?;
	}

	for (erasure_set, working_merkle_root_meta) in merkle_root_metas {
	if !working_merkle_root_meta.should_write() {
	// No need to rewrite the column
	continue;
	}
	write_batch.put::<cf::MerkleRootMeta>(
	erasure_set.store_key(),
	working_merkle_root_meta.as_ref(),
	)?;
	}

	let erasure_meta_entry = erasure_metas.entry(erasure_set).or_insert_with(\|\| {
	self.erasure_meta(erasure_set)
	.expect("Expect database get to succeed")
	.map(WorkingEntry::Clean)
	.unwrap_or_else(\|\| {
	WorkingEntry::Dirty(ErasureMeta::from_coding_shred(&shred).unwrap())
	})
	});

	let result = self
	.insert_coding_shred(index_meta, &shred, write_batch)
	.is_ok();

	if result {
	index_meta_working_set_entry.did_insert_occur = true;
	metrics.num_inserted += 1;

	merkle_root_metas
	.entry(erasure_set)
	.or_insert(WorkingEntry::Dirty(MerkleRootMeta::from_shred(&shred)));
	}

blockstore: send duplicate proofs for chained merkle root conflicts #102

blockstore: send duplicate proofs for chained merkle root conflicts #102

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AshwinSekar commented Apr 10, 2024 •

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