Modify the algorithm of updateFinalizedBlockRoots
#13486
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rkapka
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| @@ -374,63 +374,63 @@ func TestLoadBlocks_BadStart(t *testing.T) { | |||
| // \- B7 | |||
| func tree1(t *testing.T, beaconDB db.Database, genesisRoot []byte) ([][32]byte, []*ethpb.SignedBeaconBlock, error) { | |||
| b0 := util.NewBeaconBlock() | |||
| b0.Block.Slot = 0 | |||
| b0.Block.Slot = 1 | |||
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Incrementing slot everywhere because genesis block has slot 0
| require.NoError(t, err) | ||
| require.Equal(t, 10, len(filteredBlocks)) | ||
| require.Equal(t, 7, len(filteredBlocks)) |
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Interesting example to demonstrate the purpose of the new algorithm. The tree constructed in tree1 has orphaned blocks, but they were expected to be finalized.
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# Conflicts: # beacon-chain/db/kv/finalized_block_roots.go
| if bytes.Equal(r, checkpointRoot) { | ||
| return true, [][]byte{r} | ||
| } | ||
| children := lookupValuesForIndices(ctx, map[string][]byte{string(blockParentRootIndicesBucket): r}, tx)[0] |
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This will panic if lookupValuesForIndices returns an empty slice, which is what happens if you send a genesis root here
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I added a condition for it although it is not strictly necessary. Since the passed in map contains one key, the resulting slice will have one item.
| @@ -297,3 +232,50 @@ func (s *Store) FinalizedChildBlock(ctx context.Context, blockRoot [32]byte) (in | |||
| tracing.AnnotateError(span, err) | |||
| return blk, err | |||
| } | |||
|
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| func pathToFinalizedCheckpoint(ctx context.Context, roots [][]byte, checkpointRoot []byte, tx *bolt.Tx) (bool, [][]byte) { | |||
| if len(roots) == 1 && roots[0] == nil { | |||
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if an empty slice is passed for roots we should also exit early
| if i == len(finalized)-1 { | ||
| // We don't know the finalized child of the new finalized checkpoint. | ||
| // It will be filled out in the next function call. | ||
| container = ðpb.FinalizedBlockRootContainer{} |
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This completely misses adding in ParentRoot for the container. In fact it appears this PR has completely removed it.
| container = ðpb.FinalizedBlockRootContainer{ | ||
| ParentRoot: finalized[i-1], | ||
| } | ||
| } else if i == 0 { |
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might be better to use a switch statement ? If not handling i in a progressive order is reads better
if i == 0 {
// do something
else if i == len(finalized) -1 {
// do something
} else {
// ...
}
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What type of PR is this?
Other
What does this PR do? Why is it needed?
The motivation for this PR is the following note from
IsFinalizedBlock:This means that an orphaned block can be viewed as finalized, as was reported in #13408. To fix this, I redesigned the algorithm so that it traverses parent->child block relationships in the
blockParentRootIndicesBucketbucket to find the path between the last finalized checkpoint and the current finalized checkpoint.TestStore_OrphanedBlockIsNotFinalizedis the test covering the main improvement. I completely removedTestStore_IsFinalized_ForkEdgeCasebecause it tested that a finalized checkpoint is reverted.The new algorithm shaves off a staggering 10ms from epoch processing time 😆
Which issues(s) does this PR fix?
Fixes #13408