Avoid shifting component too large error in FileTtlBooster #11673
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
@cbi42 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator. |
hx235
reviewed
Aug 4, 2023
| @@ -0,0 +1 @@ | |||
| Fix a bug in FileTTLBooster that can cause users with a large number of levels (more than 64) to see errors like "runtime error: shift exponent .. is too large.." (#11673). | |||
There was a problem hiding this comment.
Minor but should the threshold be more than 65? The level in when num_non_empty_levels - level - 1 > 63. will be at least 1 by if-else statement.
|
@cbi42 has updated the pull request. You must reimport the pull request before landing. |
|
@cbi42 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator. |
ajkr
pushed a commit
that referenced
this pull request
Aug 7, 2023
Summary: When `num_levels` > 65, we may be shifting more than 63 bits in FileTtlBooster. This can give errors like: `runtime error: shift exponent 98 is too large for 64-bit type 'uint64_t' (aka 'unsigned long')`. This PR makes a quick fix for this issue by taking a min in the shifting component. This issue should be rare since it requires a user using a large `num_levels`. I'll follow up with a more complex fix if needed. Pull Request resolved: #11673 Test Plan: * Add a unit test that produce the above error before this PR. Need to compile it with ubsan: `COMPILE_WITH_UBSAN=1 OPT="-fsanitize-blacklist=.circleci/ubsan_suppression_list.txt" ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 compaction_picker_test` Reviewed By: hx235 Differential Revision: D48074386 Pulled By: cbi42 fbshipit-source-id: 25e59df7e93f20e0793cffb941de70ac815d9392
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
When
num_levels> 64, we may be shifting more than 63 bits in FileTtlBooster. This can give errors like:runtime error: shift exponent 98 is too large for 64-bit type 'uint64_t' (aka 'unsigned long'). This PR makes a quick fix for this issue by taking a min in the shifting component. This issue should be rare since it requires a user using a largenum_levels. I'll follow up with a more complex fix if needed.Test plan:
COMPILE_WITH_UBSAN=1 OPT="-fsanitize-blacklist=.circleci/ubsan_suppression_list.txt" ROCKSDB_DISABLE_ALIGNED_NEW=1 USE_CLANG=1 make V=1 -j32 compaction_picker_test