Summary:
This is a new API added to db.h to allow for fetching all merge operands associated with a Key. The main motivation for this API is to support use cases where doing a full online merge is not necessary as it is performance sensitive. Example use-cases:
1. Update subset of columns and read subset of columns -
Imagine a SQL Table, a row is encoded as a K/V pair (as it is done in MyRocks). If there are many columns and users only updated one of them, we can use merge operator to reduce write amplification. While users only read one or two columns in the read query, this feature can avoid a full merging of the whole row, and save some CPU.
2. Updating very few attributes in a value which is a JSON-like document -
Updating one attribute can be done efficiently using merge operator, while reading back one attribute can be done more efficiently if we don't need to do a full merge.
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API :
Status GetMergeOperands(
const ReadOptions& options, ColumnFamilyHandle* column_family,
const Slice& key, PinnableSlice* merge_operands,
GetMergeOperandsOptions* get_merge_operands_options,
int* number_of_operands)
Example usage :
int size = 100;
int number_of_operands = 0;
std::vector<PinnableSlice> values(size);
GetMergeOperandsOptions merge_operands_info;
db_->GetMergeOperands(ReadOptions(), db_->DefaultColumnFamily(), "k1", values.data(), merge_operands_info, &number_of_operands);
Description :
Returns all the merge operands corresponding to the key. If the number of merge operands in DB is greater than merge_operands_options.expected_max_number_of_operands no merge operands are returned and status is Incomplete. Merge operands returned are in the order of insertion.
merge_operands-> Points to an array of at-least merge_operands_options.expected_max_number_of_operands and the caller is responsible for allocating it. If the status returned is Incomplete then number_of_operands will contain the total number of merge operands found in DB for key.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5604
Test Plan:
Added unit test and perf test in db_bench that can be run using the command:
./db_bench -benchmarks=getmergeoperands --merge_operator=sortlist
Differential Revision: D16657366
Pulled By: vjnadimpalli
fbshipit-source-id: 0faadd752351745224ee12d4ae9ef3cb529951bf
Summary:
This adds some compression dependencies to AppVeyor CI (those whose builds can be easily scripted on Windows, i.e. Snappy, LZ4, and ZStd).
Let's see if the CI passes ;-)
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5226
Differential Revision: D15967223
fbshipit-source-id: 0914c613ac358cbb248df75cdee8099e836828dc
Summary:
Per some discussions, this will switch our Appveyor testing to use Visual Studio 2017.
Closes https://github.com/facebook/rocksdb/pull/3445
Differential Revision: D6874918
Pulled By: gfosco
fbshipit-source-id: c5a0032ca9f37f0d3baeae35c59d850d528c3176
Summary:
Make dependacies switches compatible with other OS builds
TODO: Make find_package work for Windows.
Closes https://github.com/facebook/rocksdb/pull/3322
Differential Revision: D6667637
Pulled By: sagar0
fbshipit-source-id: 5afcd7bbfe69465310a4fbc8e589f01e506b95f5
Summary:
Add -DPORTABLE=1
port::cacheline_aligned_alloc() has arguments swapped which prevents every single test from running.
Closes https://github.com/facebook/rocksdb/pull/2815
Differential Revision: D5751661
Pulled By: siying
fbshipit-source-id: e0857d6e138ec46035b3c23d7c3c751901a0a4a0
Summary:
Rework test running script.
New options SuiteRun - runs specified executables as google suite
test cases in parallel.
Run - this option now runs executables in parallel the same as 'tests'
RunAll - scans for test executables and attempts to run them all
as suites except those mentiones in RunOnly (hardcoded in the script)
or specified either in $ExcludeTestCases $ExcludeTestExe
Closes https://github.com/facebook/rocksdb/pull/2089
Differential Revision: D4832212
Pulled By: yiwu-arbug
fbshipit-source-id: 954990c
Summary:
Separate a smal subset of tests in DBTest to DBBasicTest. Tests in DBTest don't have to run in CI tests on platforms like OSX, as long as they are covered by Linux.
Closes https://github.com/facebook/rocksdb/pull/1924
Differential Revision: D4616702
Pulled By: siying
fbshipit-source-id: 13e6549
Summary:
Remove ReRuns as they only waste time.
Add env_basic_test to get more foundation coverage.
Closes https://github.com/facebook/rocksdb/pull/1788
Differential Revision: D4431433
Pulled By: IslamAbdelRahman
fbshipit-source-id: 50d07f8
Conditionally retrofit thread_posix for use with std::thread
and reuse the same logic. Posix users continue using Posix interfaces.
Enable XPRESS compression in test runs.
Fix master introduced signed/unsigned mismatch.
Add sequential rerun for any failed tests. Add env_test case.
Limit concurrency
Allow to specify individual tests
Take $Limit into account when displaying number of tests
Test code errors are currently blocking Windows Release builew
We do not want spend time building in Release what we can not run
We want to eliminate a source of most frequent errors when people
check-in test only code which can not be built in Release.
This feature will work only if you invoke msbuild against rocksdb.sln
Invoking it against ALL_BUILD target will attempt to build everything.
Add an optimized build config switch for faster test runs
Change compiler options to introduce more opitmizations and be more inline with MS internal switches.
Make appveyor build to utilize all the avaiable cores on the VM (parallel)
Introduce new appveyor configuration for daily test runs as it would take too long
to run db_test after each checkin even in paralell.
With some exclusions we make it in 38 minutes. We currently fail to install ramdisk during the build.
Add a powershell script to faicilitate paralell run for db_test cases.
Summary: Check in a simple auto-build manfiest so that developers can issue ad-hoc build for Windows in Appveyor.
Test Plan: Run it in test branch test_appveyor and it works well.
Reviewers: kradhakrishnan, rven, anthony, IslamAbdelRahman, yhchiang
Reviewed By: yhchiang
Subscribers: leveldb, dhruba
Differential Revision: https://reviews.facebook.net/D43839
