Account memory of big memory users in BlockBasedTableReader in global memory limit #9748

hx235 · 2022-03-24T09:59:02Z

Context:
Through heap profiling, we discovered that BlockBasedTableReader objects can accumulate and lead to high memory usage (e.g, max_open_file = -1). These memories are currently not saved, not tracked, not constrained and not cache evict-able. As a first step to improve this, similar to #8428, this PR is to track an estimate of BlockBasedTableReader object's memory in block cache and fail future creation if the memory usage exceeds the available space of cache at the time of creation.

Summary:

Approximate big memory users (BlockBasedTable::Rep and TableProperties )' memory usage in addition to the existing estimated ones (filter block/index block/un-compression dictionary)
Charge all of these memory usages to block cache on BlockBasedTable::Open() and release them on ~BlockBasedTable() as there is no memory usage fluctuation of concern in between
Refactor on CacheReservationManager (and its call-sites) to add concurrent support for BlockBasedTable used in this PR.

Test:

New unit tests
db bench: OpenDb : -0.52% in ms
- Setup ./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -disable_auto_compactions=1 -write_buffer_size=1048576
- Repeated run with pre-change w/o feature and post-change with feature, benchmark OpenDb: ./db_bench -benchmarks=readrandom -use_existing_db=1 -db=/dev/shm/testdb -reserve_table_reader_memory=true (remove this when running w/o feature) -file_opening_threads=3 -open_files=-1 -report_open_timing=true| egrep 'OpenDb:'

#-run	(feature-off) avg milliseconds	std milliseconds	(feature-on) avg milliseconds	std milliseconds	change (%)
10	11.4018	5.95173	9.47788	1.57538	-16.87382694
20	9.23746	0.841053	9.32377	1.14074	0.9343477536
40	9.0876	0.671129	9.35053	1.11713	2.893283155
80	9.72514	2.28459	9.52013	1.0894	-2.108041632
160	9.74677	0.991234	9.84743	1.73396	1.032752389
320	10.7297	5.11555	10.547	1.97692	-1.70275031
640	11.7092	2.36565	11.7869	2.69377	0.6635807741

db bench on write with cost to cache in WriteBufferManager (just in case this PR's CRM refactoring accidentally slows down anything in WBM) : fillseq : +0.54% in micros/op
./db_bench -benchmarks=fillseq -db=/dev/shm/testdb -disable_auto_compactions=1 -cost_write_buffer_to_cache=true -write_buffer_size=10000000000 | egrep 'fillseq'

#-run	(pre-PR) avg micros/op	std micros/op	(post-PR) avg micros/op	std micros/op	change (%)
10	6.15	0.260187	6.289	0.371192	2.260162602
20	7.28025	0.465402	7.37255	0.451256	1.267813605
40	7.06312	0.490654	7.13803	0.478676	1.060579461
80	7.14035	0.972831	7.14196	0.92971	0.02254791432

filter bench: bloom filter: -0.78% in ms/key
- ./filter_bench -impl=2 -quick -reserve_table_builder_memory=true | grep 'Build avg'

#-run	(pre-PR) avg ns/key	std ns/key	(post-PR) ns/key	std ns/key	change (%)
10	26.4369	0.442182	26.3273	0.422919	-0.4145720565
20	26.4451	0.592787	26.1419	0.62451	-1.1465262

Crash test python3 tools/db_crashtest.py blackbox --reserve_table_reader_memory=1 --cache_size=1 killed as normal

memory/cache_capacity_based_memory_allocator.h

hx235 · 2022-03-24T21:24:08Z

table/block_based/block_based_table_factory.cc

@@ -419,6 +423,12 @@ BlockBasedTableFactory::BlockBasedTableFactory(
    : table_options_(_table_options) {
  InitializeOptions();
  RegisterOptions(&table_options_, &block_based_table_type_info);
+
+  if (table_options_.reserve_table_reader_memory &&
+      table_options_.no_block_cache == false) {


[Note] A fun little thing I found is when table_options_.no_block_cache is set to 1 by option string, the negate of it !table_options_.no_block_cache in dbg build (but not DEBUG_LEVEL=1) evaluates to True incorrectly ......

hx235 · 2022-03-24T22:16:22Z

table/meta_blocks.cc

    } else if (key == TablePropertiesNames::kDbId) {
      new_table_properties->db_id = raw_val.ToString();
+      new_table_properties->IncreaseApproximateMemoryUsage(raw_val.size());


Not my favorite code repetition either but couldn't find an easy way to avoid that ...

It could be an 'else' for pos != predefined_uint64_properties.end() with the rest of these if-else under that 'else'.

Will fix this (previously I avoided it due to the nested if-else but now I think it is still better than code duplication)

I think one "longer-term" fix is to avoid "key == TablePropertiesNames::XX" pattern and use set. Opened a tech debt for it.

Done by on-the-fly memory approximation for table properties

facebook-github-bot · 2022-03-25T04:40:19Z

@hx235 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

ajkr

Thanks very much for doing this work. Left a few suggestions/questions.

table/block_based/block_based_table_reader_test.cc

include/rocksdb/table.h

table/block_based/block_based_table_reader.cc

memory/cache_capacity_based_memory_allocator.h

facebook-github-bot · 2022-03-29T09:23:15Z

@hx235 has updated the pull request. You must reimport the pull request before landing.

facebook-github-bot · 2022-03-29T09:24:33Z

@hx235 has updated the pull request. You must reimport the pull request before landing.

facebook-github-bot · 2022-03-29T09:39:44Z

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hx235 · 2022-03-29T09:45:51Z

Waiting for CI signals and re-benchmarking
Update:

Clarified BlockBasedTableOptins::reserve_table_reader_memory API doc
Refactored block_based_table_reader_test, including refactoring out BlockBasedTableReaderTestBase, encapsulating details on approximating table reader mem, removing a unused function and minor code changes
Used CacheReservationManagerThreadsafeWrapper::CacheReservationHandle for BlockBasedTableReader's reservation for better RAII on cache reservation. This includes:
- Modified CacheReservationManager and its API comment to add better support for multi-threaded usage of CacheReservationHandle; renamed usage of previous CacheReservationManagerHandle
- Removed unused class CacheCapacityBasedMemoryAllocator

facebook-github-bot · 2022-03-29T09:46:01Z

@hx235 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

facebook-github-bot · 2022-03-29T10:45:03Z

@hx235 has updated the pull request. You must reimport the pull request before landing.

facebook-github-bot · 2022-03-29T16:21:40Z

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ajkr

Do you mind importing it? Sorry it's hard to read on GitHub.

Replies to outdated comments:

Not sure how "disable the cache Insert() while that particular table is created." is done but updated the test to use ConfigureTableFactory() and added more comment. Let's see if this helps.

I meant since you are the implementor of the cache, you could make Insert() return Status::OK() without doing any work while you calculate per-table memory.

hx235 · 2022-03-29T20:32:06Z

Sure - although I need to fix the ci/circleci: build-linux-clang10-clang-analyze. Importing it

ajkr

LGTM!

ajkr · 2022-04-05T07:19:47Z

table/table_properties.cc

+std::pair<const uint64_t*, const uint64_t*> TEST_GetUint64TPropStartEndPosition(
+    const TableProperties* const_props) {
+  TableProperties* props = const_cast<TableProperties*>(const_props);
+  uint64_t* pu = &props->orig_file_number;
+  assert(static_cast<void*>(pu) == static_cast<void*>(props));
+  const uint64_t* pu_end = reinterpret_cast<const uint64_t*>(&props->db_id);
+  return std::pair<const uint64_t*, const uint64_t*>(pu, pu_end);
+}
+
+std::pair<const std::string*, const std::string*>
+TEST_GetStringPropStartEndPosition(const TableProperties* const_props) {
+  TableProperties* props = const_cast<TableProperties*>(const_props);
+  std::string* ps = &props->db_id;
+  assert(static_cast<void*>(const_cast<uint64_t*>(
+             TEST_GetUint64TPropStartEndPosition(props).second)) ==
+         static_cast<void*>(ps));
+  const std::string* ps_end =
+      reinterpret_cast<const std::string*>(&props->user_collected_properties);
+  return std::pair<const std::string*, const std::string*>(ps, ps_end);
+}


OK it makes enough sense to me. Just make sure to eliminate all TEST_ in non-test code, const_casts, and reinterpret_casts (ideally).

edit: I kind of doubt we should be doing this (reinterpret_cast<const std::string*>(&props->user_collected_properties)) at all. What if user_collected_properties has different alignment from string?

facebook-github-bot · 2022-04-05T08:05:31Z

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facebook-github-bot · 2022-04-05T08:10:38Z

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… crmhandle

…ator && protect ReleaseCacheReservation

…etXXPropStartEndPos()

facebook-github-bot · 2022-04-06T06:46:43Z

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facebook-github-bot · 2022-04-06T06:48:26Z

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…tion

facebook-github-bot · 2022-04-06T07:02:44Z

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facebook-github-bot · 2022-04-06T07:03:42Z

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…tween fields in TableProperties struct (#9812) Summary: Context: #9748 (comment) reveals an issue with TEST_SetRandomTableProperties when non-zero padding is used between the last string field and first non-string field in TableProperties. Fixed by #9748 (comment) Pull Request resolved: #9812 Test Plan: No production code changes and rely on existing CI Reviewed By: ajkr Differential Revision: D35423680 Pulled By: hx235 fbshipit-source-id: fd855eef3d32771bb79c65bd7012ab8bb3c400ab

…Test.CapMemoryUsageUnderCacheCapacity (#9869) Summary: **Context:** Unit test for #9748 keeps opening new files to see whether the new feature is able to correctly constrain the opening based on block cache capacity. However, the unit test has two places written inefficiently that can lead to opening too many new files relative to underlying operating system/file system constraint, even before hitting the block cache capacity: (1) [opened_table_reader_num < 2 * max_table_reader_num](https://github.com/facebook/rocksdb/pull/9748/files?show-viewed-files=true&file-filters%5B%5D=#diff-ec9f5353e317df71093094734ba29193b94a998f0f9c9af924e4c99692195eeaR438), which can leads to 1200 + open files because of (2) below (2) NewLRUCache(6 * CacheReservationManagerImpl<CacheEntryRole::kBlockBasedTableReader>::GetDummyEntrySize()) in [here](https://github.com/facebook/rocksdb/pull/9748/files?show-viewed-files=true&file-filters%5B%5D=#diff-ec9f5353e317df71093094734ba29193b94a998f0f9c9af924e4c99692195eeaR364) Therefore we see CI failures like this on machine with a strict open file limit ~1000 (see the "table_1021" naming in following error msg) https://app.circleci.com/pipelines/github/facebook/rocksdb/12886/workflows/75524682-3fa4-41ee-9a61-81827b51d99b/jobs/345270 ``` fs_->NewWritableFile(path, foptions, &file, nullptr) IO error: While open a file for appending: /dev/shm/rocksdb.Jedwt/run-block_based_table_reader_test-CapMemoryUsageUnderCacheCapacity-BlockBasedTableReaderCapMemoryTest.CapMemoryUsageUnderCacheCapacity-0/block_based_table_reader_test_1668910_829492452552920927/**table_1021**: Too many open files ``` **Summary:** - Revised the test more efficiently on the above 2 places, including using 1.1 instead 2 in the threshold and lowering down the block cache capacity a bit - Renamed some variables for clarity Pull Request resolved: #9869 Test Plan: - Manual inspection of max opened table reader in all test case, which is around ~389 - Circle CI to see if error is gone Reviewed By: ajkr Differential Revision: D35752655 Pulled By: hx235 fbshipit-source-id: 8a0953d39d561babfa4257b8ed8550bb21b04839

…Test.CapMemoryUsageUnderCacheCapacity (facebook#9869) Summary: **Context:** Unit test for facebook#9748 keeps opening new files to see whether the new feature is able to correctly constrain the opening based on block cache capacity. However, the unit test has two places written inefficiently that can lead to opening too many new files relative to underlying operating system/file system constraint, even before hitting the block cache capacity: (1) [opened_table_reader_num < 2 * max_table_reader_num](https://github.com/facebook/rocksdb/pull/9748/files?show-viewed-files=true&file-filters%5B%5D=#diff-ec9f5353e317df71093094734ba29193b94a998f0f9c9af924e4c99692195eeaR438), which can leads to 1200 + open files because of (2) below (2) NewLRUCache(6 * CacheReservationManagerImpl<CacheEntryRole::kBlockBasedTableReader>::GetDummyEntrySize()) in [here](https://github.com/facebook/rocksdb/pull/9748/files?show-viewed-files=true&file-filters%5B%5D=#diff-ec9f5353e317df71093094734ba29193b94a998f0f9c9af924e4c99692195eeaR364) Therefore we see CI failures like this on machine with a strict open file limit ~1000 (see the "table_1021" naming in following error msg) https://app.circleci.com/pipelines/github/facebook/rocksdb/12886/workflows/75524682-3fa4-41ee-9a61-81827b51d99b/jobs/345270 ``` fs_->NewWritableFile(path, foptions, &file, nullptr) IO error: While open a file for appending: /dev/shm/rocksdb.Jedwt/run-block_based_table_reader_test-CapMemoryUsageUnderCacheCapacity-BlockBasedTableReaderCapMemoryTest.CapMemoryUsageUnderCacheCapacity-0/block_based_table_reader_test_1668910_829492452552920927/**table_1021**: Too many open files ``` **Summary:** - Revised the test more efficiently on the above 2 places, including using 1.1 instead 2 in the threshold and lowering down the block cache capacity a bit - Renamed some variables for clarity Pull Request resolved: facebook#9869 Test Plan: - Manual inspection of max opened table reader in all test case, which is around ~389 - Circle CI to see if error is gone Reviewed By: ajkr Differential Revision: D35752655 Pulled By: hx235 fbshipit-source-id: 8a0953d39d561babfa4257b8ed8550bb21b04839

Summary: **Context:** Previous PR #9748, #9073, #8428 added separate flag for each charged memory area. Such API design is not scalable as we charge more and more memory areas. Also, we foresee an opportunity to consolidate this feature with other cache usage related features such as `cache_index_and_filter_blocks` using `CacheEntryRole`. Therefore we decided to consolidate all these flags with `CacheUsageOptions cache_usage_options` and this PR serves as the first step by consolidating memory-charging related flags. **Summary:** - Replaced old API reference with new ones, including making `kCompressionDictionaryBuildingBuffer` opt-out and added a unit test for that - Added missing db bench/stress test for some memory charging features - Renamed related test suite to indicate they are under the same theme of memory charging - Refactored a commonly used mocked cache component in memory charging related tests to reduce code duplication - Replaced the phrases "memory tracking" / "cache reservation" (other than CacheReservationManager-related ones) with "memory charging" for standard description of this feature. Pull Request resolved: #9926 Test Plan: - New unit test for opt-out `kCompressionDictionaryBuildingBuffer` `TEST_F(ChargeCompressionDictionaryBuildingBufferTest, Basic)` - New unit test for option validation/sanitization `TEST_F(CacheUsageOptionsOverridesTest, SanitizeAndValidateOptions)` - CI - db bench (in case querying new options introduces regression) **+0.5% micros/op**: `TEST_TMPDIR=/dev/shm/testdb ./db_bench -benchmarks=fillseq -db=$TEST_TMPDIR -charge_compression_dictionary_building_buffer=1(remove this for comparison) -compression_max_dict_bytes=10000 -disable_auto_compactions=1 -write_buffer_size=100000 -num=4000000 | egrep 'fillseq'` #-run | (pre-PR) avg micros/op | std micros/op | (post-PR) micros/op | std micros/op | change (%) -- | -- | -- | -- | -- | -- 10 | 3.9711 | 0.264408 | 3.9914 | 0.254563 | 0.5111933721 20 | 3.83905 | 0.0664488 | 3.8251 | 0.0695456 | **-0.3633711465** 40 | 3.86625 | 0.136669 | 3.8867 | 0.143765 | **0.5289363078** - db_stress: `python3 tools/db_crashtest.py blackbox -charge_compression_dictionary_building_buffer=1 -charge_filter_construction=1 -charge_table_reader=1 -cache_size=1` killed as normal Reviewed By: ajkr Differential Revision: D36054712 Pulled By: hx235 fbshipit-source-id: d406e90f5e0c5ea4dbcb585a484ad9302d4302af

…rance rate from 1% to 5% (#10113) Summary: **Context:** #9748 added support to charge table reader memory to block cache. In the test `ChargeTableReaderTest/ChargeTableReaderTest.Basic`, it estimated the table reader memory, calculated the expected number of table reader opened based on this estimation and asserted this number with actual number. The expected number of table reader opened calculated based on estimated table reader memory will not be 100% accurate and should have tolerance for error. It was previously set to 1% and recently encountered an assertion failure that `(opened_table_reader_num) <= (max_table_reader_num_capped_upper_bound), actual: 375 or 376 vs 374` where `opened_table_reader_num` is the actual opened one and `max_table_reader_num_capped_upper_bound` is the estimated opened one (=371 * 1.01). I believe it's safe to increase error tolerance from 1% to 5% hence there is this PR. Pull Request resolved: #10113 Test Plan: - CI again succeeds. Reviewed By: ajkr Differential Revision: D36911556 Pulled By: hx235 fbshipit-source-id: 259687dd77b450fea0f5658a5b567a1d31d4b1f7

facebook-github-bot added the CLA Signed label Mar 24, 2022

hx235 added WIP Work in progress and removed CLA Signed labels Mar 24, 2022

hx235 force-pushed the cap_table_reader_mem branch from 19622e4 to a951297 Compare March 24, 2022 10:45

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hx235 force-pushed the cap_table_reader_mem branch 2 times, most recently from b2537fc to 827d320 Compare March 24, 2022 20:51

hx235 changed the title ~~Account memory of BlockBasedTable::Rep + TableProperties of BlockBasedTableReader~~ Account memory of BlockBasedTable::Rep + TableProperties of BlockBasedTableReader in global memory limit Mar 24, 2022

hx235 commented Mar 24, 2022

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hx235 requested a review from ajkr March 25, 2022 02:08

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hx235 force-pushed the cap_table_reader_mem branch from 827d320 to 5325760 Compare March 29, 2022 09:23

hx235 force-pushed the cap_table_reader_mem branch from 5325760 to 3e9992d Compare March 29, 2022 09:24

hx235 force-pushed the cap_table_reader_mem branch from 3e9992d to 99552c2 Compare March 29, 2022 09:39

hx235 changed the title ~~Account memory of BlockBasedTable::Rep + TableProperties of BlockBasedTableReader in global memory limit~~ Account memory of big memory users in BlockBasedTable in global memory limit Mar 29, 2022

hx235 force-pushed the cap_table_reader_mem branch from 99552c2 to 432c0c2 Compare March 29, 2022 10:45

hx235 force-pushed the cap_table_reader_mem branch from 432c0c2 to 69a743c Compare March 29, 2022 16:21

ajkr reviewed Mar 29, 2022

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ajkr approved these changes Apr 5, 2022

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hx235 added 8 commits April 5, 2022 23:46

Account BlockBasedTable::Rep, TableProperties's memory to caache

17a3898

Feedback: clearer testing/api doc & use thread-safe crm wrapper & use…

31b83a8

… crmhandle

attempt to solve access of nullptr warning

26e25f2

Feedback: clarify CacheReservationHandle API comment

89f8c36

Feedback: de-template CRM && template CRMImpl && Concurrent CRM decor…

17b04bf

…ator && protect ReleaseCacheReservation

CI test: loosen upper bound of actual # table reader created in test

86066c4

Feedback: two CRM handles; on-the-fly table properties mem approx

a37970b

Feedback: remove ReleaseCacheRes() from abstrat interface && polish G…

8bc7e07

…etXXPropStartEndPos()

hx235 force-pushed the cap_table_reader_mem branch from 3a0af6e to 4c73d59 Compare April 6, 2022 06:46

hx235 mentioned this pull request Apr 6, 2022

Fix a bug of TEST_SetRandomTableProperties due to non-zero padding between fields in TableProperties struct #9812

Closed

Feedback: replace TableProperties iteration hack with explict enumera…

321fb98

…tion

hx235 force-pushed the cap_table_reader_mem branch from 4c73d59 to 321fb98 Compare April 6, 2022 07:02

facebook-github-bot closed this in 49623f9 Apr 6, 2022

hx235 mentioned this pull request Apr 19, 2022

Fix issue of opening too many files in BlockBasedTableReaderCapMemoryTest.CapMemoryUsageUnderCacheCapacity #9869

Closed

hx235 mentioned this pull request May 1, 2022

Rewrite memory-charging feature's option API #9926

Closed

hx235 mentioned this pull request Jun 3, 2022

Increase ChargeTableReaderTest/ChargeTableReaderTest.Basic error tolerance rate from 1% to 5% #10113

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hx235 changed the title ~~Account memory of big memory users in BlockBasedTable in global memory limit~~ Account memory of big memory users in BlockBasedTableReader in global memory limit Jan 9, 2023

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Account memory of big memory users in BlockBasedTableReader in global memory limit #9748

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Account memory of big memory users in BlockBasedTableReader in global memory limit #9748

Account memory of big memory users in BlockBasedTableReader in global memory limit #9748

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