- 02 11月, 2017 3 次提交
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由 Maysam Yabandeh 提交于
Summary: Implements ValidateSnapshot for WritePrepared txns and also adds a unit test to clarify the contract of this function. Closes https://github.com/facebook/rocksdb/pull/3101 Differential Revision: D6199405 Pulled By: maysamyabandeh fbshipit-source-id: ace509934c307ea5d26f4bbac5f836d7c80fd240
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由 Mikhail Antonov 提交于
Summary: The motivation for this PR is to add to RocksDB support for differential (incremental) snapshots, as snapshot of the DB changes between two points in time (one can think of it as diff between to sequence numbers, or the diff D which can be thought of as an SST file or just set of KVs that can be applied to sequence number S1 to get the database to the state at sequence number S2). This feature would be useful for various distributed storages layers built on top of RocksDB, as it should help reduce resources (time and network bandwidth) needed to recover and rebuilt DB instances as replicas in the context of distributed storages. From the API standpoint that would like client app requesting iterator between (start seqnum) and current DB state, and reading the "diff". This is a very draft PR for initial review in the discussion on the approach, i'm going to rework some parts and keep updating the PR. For now, what's done here according to initial discussions: Preserving deletes: - We want to be able to optionally preserve recent deletes for some defined period of time, so that if a delete came in recently and might need to be included in the next incremental snapshot it would't get dropped by a compaction. This is done by adding new param to Options (preserve deletes flag) and new variable to DB Impl where we keep track of the sequence number after which we don't want to drop tombstones, even if they are otherwise eligible for deletion. - I also added a new API call for clients to be able to advance this cutoff seqnum after which we drop deletes; i assume it's more flexible to let clients control this, since otherwise we'd need to keep some kind of timestamp < -- > seqnum mapping inside the DB, which sounds messy and painful to support. Clients could make use of it by periodically calling GetLatestSequenceNumber(), noting the timestamp, doing some calculation and figuring out by how much we need to advance the cutoff seqnum. - Compaction codepath in compaction_iterator.cc has been modified to avoid dropping tombstones with seqnum > cutoff seqnum. Iterator changes: - couple params added to ReadOptions, to optionally allow client to request internal keys instead of user keys (so that client can get the latest value of a key, be it delete marker or a put), as well as min timestamp and min seqnum. TableCache changes: - I modified table_cache code to be able to quickly exclude SST files from iterators heep if creation_time on the file is less then iter_start_ts as passed in ReadOptions. That would help a lot in some DB settings (like reading very recent data only or using FIFO compactions), but not so much for universal compaction with more or less long iterator time span. What's left: - Still looking at how to best plug that inside DBIter codepath. So far it seems that FindNextUserKeyInternal only parses values as UserKeys, and iter->key() call generally returns user key. Can we add new API to DBIter as internal_key(), and modify this internal method to optionally set saved_key_ to point to the full internal key? I don't need to store actual seqnum there, but I do need to store type. Closes https://github.com/facebook/rocksdb/pull/2999 Differential Revision: D6175602 Pulled By: mikhail-antonov fbshipit-source-id: c779a6696ee2d574d86c69cec866a3ae095aa900
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由 Maysam Yabandeh 提交于
Summary: GetCommitTimeWriteBatch is currently used to store some state as part of commit in 2PC. In MyRocks it is specifically used to store some data that would be needed only during recovery. So it is not need to be stored in memtable right after each commit. This patch enables an optimization to write the GetCommitTimeWriteBatch only to the WAL. The batch will be written to memtable during recovery when the WAL is replayed. To cover the case when WAL is deleted after memtable flush, the batch is also buffered and written to memtable right before each memtable flush. Closes https://github.com/facebook/rocksdb/pull/3071 Differential Revision: D6148023 Pulled By: maysamyabandeh fbshipit-source-id: 2d09bae5565abe2017c0327421010d5c0d55eaa7
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- 01 11月, 2017 4 次提交
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由 Maysam Yabandeh 提交于
Summary: The collapse of duplicate keys in write batch needs to sort the indexes of duplicate keys since it only checks the index in the batch with the head of the list of duplicate keys. Closes https://github.com/facebook/rocksdb/pull/3093 Differential Revision: D6186800 Pulled By: maysamyabandeh fbshipit-source-id: abc9ae8c2f1840445a5584f925cf86ecc6f37154
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由 Yi Wu 提交于
Summary: * cleanup num_concurrent_simple_blobs. We don't do concurrent writes (by taking write_mutex_) so it doesn't make sense to have multiple non TTL files open. We can revisit later when we want to improve writes. * cleanup eviction callback. we don't have plan to use it now. * rename s/open_simple_blob_files_/open_non_ttl_file_/ and s/open_blob_files_/open_ttl_files_/ to avoid confusion. Closes https://github.com/facebook/rocksdb/pull/3088 Differential Revision: D6182598 Pulled By: yiwu-arbug fbshipit-source-id: 99e6f5e01fa66d31309cdb06ce48502464bac6ad
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由 Sagar Vemuri 提交于
Summary: Fixing un-itializations caught by valgrind. Closes https://github.com/facebook/rocksdb/pull/3103 Differential Revision: D6200195 Pulled By: sagar0 fbshipit-source-id: bf35a3fb03eb1d308e4c5ce30dee1e345d7b03b3
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由 Shaohua Li 提交于
Summary: The DBOptions::writable_file_max_buffer_size can be changed dynamically. Closes https://github.com/facebook/rocksdb/pull/3053 Differential Revision: D6152720 Pulled By: shligit fbshipit-source-id: aa0c0cfcfae6a54eb17faadb148d904797c68681
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- 31 10月, 2017 2 次提交
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由 Prashant D 提交于
Summary: There seems to be a typo mistake in env ReuseWritableFile func where status is being returned twice. Closes https://github.com/facebook/rocksdb/pull/3099 Differential Revision: D6196204 Pulled By: ajkr fbshipit-source-id: abb6e3e1c1e772dd485fc39e7f1b9d502fa188fe
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由 Andrew Kryczka 提交于
Summary: - Release all snapshots before crashing and reopening the DB. Without this, we may attempt to release snapshots from an old DB using a new DB. That tripped an assertion. - Release multiple snapshots in the same operation if needed. Without this, we would sometimes leak snapshots. Closes https://github.com/facebook/rocksdb/pull/3098 Differential Revision: D6194923 Pulled By: ajkr fbshipit-source-id: b9c89bcca7ebcbb6c7802c616f9d1175a005aadf
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- 30 10月, 2017 1 次提交
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由 Andrew Kryczka 提交于
Summary: The assertion was caught by `MySQLStyleTransactionTest/MySQLStyleTransactionTest.TransactionStressTest/5` when run in a loop. The caller doesn't track whether the released snapshot is oldest, so let this function handle that case. Closes https://github.com/facebook/rocksdb/pull/3080 Differential Revision: D6185257 Pulled By: ajkr fbshipit-source-id: 4b3015c11db5d31e46521a00af568546ef4558cd
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- 29 10月, 2017 1 次提交
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由 Yi Wu 提交于
Summary: write_options.sync = true and write_options.disableWAL is incompatible. When WAL is disabled, we are not able to persist the write immediately. Return an error in this case to avoid misuse of the options. Closes https://github.com/facebook/rocksdb/pull/3086 Differential Revision: D6176822 Pulled By: yiwu-arbug fbshipit-source-id: 1eb10028c14fe7d7c13c8bc12c0ef659f75aa071
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- 28 10月, 2017 7 次提交
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由 Andrew Kryczka 提交于
Summary: Problem was in bottommost compaction, when an L0->L0 compaction happened and L0 was bottommost. Then we'd preserve tombstones according to `Compaction::KeyNotExistsBeyondOutputLevel`, while zeroing seqnum according to `CompactionIterator::PrepareOutput`, thus triggering the assertion in `PrepareOutput`. To fix, we can just drop tombstones in L0->L0 when the output is "bottommost", i.e., the compaction includes the oldest L0 file and there's nothing at lower levels. Closes https://github.com/facebook/rocksdb/pull/3085 Differential Revision: D6175742 Pulled By: ajkr fbshipit-source-id: 8ab19a2e001496f362e9eb0a71757e2f6ecfdb3b
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由 Yi Wu 提交于
Summary: We don't propagate TableProperty::oldest_key_time on compaction and just write the default value to SST files. It is more natural to default the value to 0. Also revert db_sst_test back to before #2842. Closes https://github.com/facebook/rocksdb/pull/3079 Differential Revision: D6165702 Pulled By: yiwu-arbug fbshipit-source-id: ca3ce5928d96ae79a5beb12bb7d8c640a71478a0
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由 Islam AbdelRahman 提交于
Summary: SstFileManager move files that need to be deleted into a trash directory. Deprecate this behaviour and instead add ".trash" extension to files that need to be deleted Closes https://github.com/facebook/rocksdb/pull/2970 Differential Revision: D5976805 Pulled By: IslamAbdelRahman fbshipit-source-id: 27374ece4315610b2792c30ffcd50232d4c9a343
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由 Yi Wu 提交于
Summary: Changing blob file format and some code cleanup around the change. The change with blob log format are: * Remove timestamp field in blob file header, blob file footer and blob records. The field is not being use and often confuse with expiration field. * Blob file header now come with column family id, which always equal to default column family id. It leaves room for future support of column family. * Compression field in blob file header now is a standalone byte (instead of compact encode with flags field) * Blob file footer now come with its own crc. * Key length now being uint64_t instead of uint32_t * Blob CRC now checksum both key and value (instead of value only). * Some reordering of the fields. The list of cleanups: * Better inline comments in blob_log_format.h * rename ttlrange_t and snrange_t to ExpirationRange and SequenceRange respectively. * simplify blob_db::Reader * Move crc checking logic to inside blob_log_format.cc Closes https://github.com/facebook/rocksdb/pull/3081 Differential Revision: D6171304 Pulled By: yiwu-arbug fbshipit-source-id: e4373e0d39264441b7e2fbd0caba93ddd99ea2af
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由 Dmitri Smirnov 提交于
Summary: Reuse WITH_JEMALLOC option in preparation for module search unification. Move jemalloc overrides into a separate .cc Remote obsolete JEMALLOC_NOINIT option. Closes https://github.com/facebook/rocksdb/pull/3078 Differential Revision: D6174826 Pulled By: yiwu-arbug fbshipit-source-id: 9970a0289b4490272d15853920d9d7531af91140
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由 Prashant D 提交于
Summary: Coverity uninitialized member variable warnings in lru_cache Closes https://github.com/facebook/rocksdb/pull/3082 Differential Revision: D6173062 Pulled By: sagar0 fbshipit-source-id: 7bcfc653457bd362d46045d06527838c9a6adad6
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由 Prashant D 提交于
Summary: db/column_family.h : 79 ColumnFamilyHandleInternal() CID 1322806 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR) 2. uninit_member: Non-static class member internal_cfd_ is not initialized in this constructor nor in any functions that it calls. 80 : ColumnFamilyHandleImpl(nullptr, nullptr, nullptr) {} db/compacted_db_impl.cc: 18CompactedDBImpl::CompactedDBImpl( 19 const DBOptions& options, const std::string& dbname) 20 : DBImpl(options, dbname) { 2. uninit_member: Non-static class member cfd_ is not initialized in this constructor nor in any functions that it calls. 4. uninit_member: Non-static class member version_ is not initialized in this constructor nor in any functions that it calls. CID 1396120 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR) 6. uninit_member: Non-static class member user_comparator_ is not initialized in this constructor nor in any functions that it calls. 21} db/compaction_iterator.cc: 9. uninit_member: Non-static class member current_user_key_sequence_ is not initialized in this constructor nor in any functions that it calls. 11. uninit_member: Non-static class member current_user_key_snapshot_ is not initialized in this constructor nor in any functions that it calls. CID 1419855 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR) 13. uninit_member: Non-static class member current_key_committed_ is not initialized in this constructor nor in any functions that it calls. Closes https://github.com/facebook/rocksdb/pull/3084 Differential Revision: D6172999 Pulled By: sagar0 fbshipit-source-id: 084d73393faf8022c01359cfb445807b6a782460
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- 27 10月, 2017 4 次提交
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由 Prashant D 提交于
Pulled By: ajkr Differential Revision: D6170448 fbshipit-source-id: 5fd6d1608fc0df27c94d9f5059315ce7f79b8f5c
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由 Prashant D 提交于
Summary: 228MutableDBOptions::MutableDBOptions() 229 : max_background_jobs(2), 230 base_background_compactions(-1), 231 max_background_compactions(-1), 232 avoid_flush_during_shutdown(false), 233 delayed_write_rate(2 * 1024U * 1024U), 234 max_total_wal_size(0), 235 delete_obsolete_files_period_micros(6ULL * 60 * 60 * 1000000), 236 stats_dump_period_sec(600), 2. uninit_member: Non-static class member bytes_per_sync is not initialized in this constructor nor in any functions that it calls. CID 1419857 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR) 4. uninit_member: Non-static class member wal_bytes_per_sync is not initialized in this constructor nor in any functions that it calls. 237 max_open_files(-1) {} Closes https://github.com/facebook/rocksdb/pull/3069 Differential Revision: D6170424 Pulled By: ajkr fbshipit-source-id: 1f94e86b87611ad2330b8b1707911150978d68b8
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由 Andrew Kryczka 提交于
Summary: - for `SeekToFirst()`, just convert it to a regular `Seek()` if lower bound is specified - for operations that iterate backwards over user keys (`SeekForPrev`, `SeekToLast`, `Prev`), change `PrevInternal` to check whether user key went below lower bound every time the user key changes -- same approach we use to ensure we stay within a prefix when `prefix_same_as_start=true`. Closes https://github.com/facebook/rocksdb/pull/3074 Differential Revision: D6158654 Pulled By: ajkr fbshipit-source-id: cb0e3a922e2650d2cd4d1c6e1c0f1e8b729ff518
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由 Yi Wu 提交于
Summary: Adding the `min_blob_size` option to allow storing small values in base db (in LSM tree) together with the key. The goal is to improve performance for small values, while taking advantage of blob db's low write amplification for large values. Also adding expiration timestamp to blob index. It will be useful to evict stale blob indexes in base db by adding a compaction filter. I'll work on the compaction filter in future patches. See blob_index.h for the new blob index format. There are 4 cases when writing a new key: * small value w/o TTL: put in base db as normal value (i.e. ValueType::kTypeValue) * small value w/ TTL: put (type, expiration, value) to base db. * large value w/o TTL: write value to blob log and put (type, file, offset, size, compression) to base db. * large value w/TTL: write value to blob log and put (type, expiration, file, offset, size, compression) to base db. Closes https://github.com/facebook/rocksdb/pull/3066 Differential Revision: D6142115 Pulled By: yiwu-arbug fbshipit-source-id: 9526e76e19f0839310a3f5f2a43772a4ad182cd0
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- 26 10月, 2017 3 次提交
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由 Andrew Kryczka 提交于
Summary: When snapshots are held for a long time, files may reach the bottom level containing overwritten/deleted keys. We previously had no mechanism to trigger compaction on such files. This particularly impacted DBs that write to different parts of the keyspace over time, as such files would never be naturally compacted due to second-last level files moving down. This PR introduces a mechanism for bottommost files to be recompacted upon releasing all snapshots that prevent them from dropping their deleted/overwritten keys. - Changed `CompactionPicker` to compact files in `BottommostFilesMarkedForCompaction()`. These are the last choice when picking. Each file will be compacted alone and output to the same level in which it originated. The goal of this type of compaction is to rewrite the data excluding deleted/overwritten keys. - Changed `ReleaseSnapshot()` to recompute the bottom files marked for compaction when the oldest existing snapshot changes, and schedule a compaction if needed. We cache the value that oldest existing snapshot needs to exceed in order for another file to be marked in `bottommost_files_mark_threshold_`, which allows us to avoid recomputing marked files for most snapshot releases. - Changed `VersionStorageInfo` to track the list of bottommost files, which is recomputed every time the version changes by `UpdateBottommostFiles()`. The list of marked bottommost files is first computed in `ComputeBottommostFilesMarkedForCompaction()` when the version changes, but may also be recomputed when `ReleaseSnapshot()` is called. - Extracted core logic of `Compaction::IsBottommostLevel()` into `VersionStorageInfo::RangeMightExistAfterSortedRun()` since logic to check whether a file is bottommost is now necessary outside of compaction. Closes https://github.com/facebook/rocksdb/pull/3009 Differential Revision: D6062044 Pulled By: ajkr fbshipit-source-id: 123d201cf140715a7d5928e8b3cb4f9cd9f7ad21
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由 Sagar Vemuri 提交于
Summary: I found that we continue accepting writes even when the blob db goes beyond the configured blob directory size limit. Now, we return an error for writes on reaching `blob_dir_size` limit and if `is_fifo` is set to false. (We cannot just drop any file when `is_fifo` is true.) Deleting the oldest file when `is_fifo` is true will be handled in a later PR. Closes https://github.com/facebook/rocksdb/pull/3060 Differential Revision: D6136156 Pulled By: sagar0 fbshipit-source-id: 2f11cb3f2eedfa94524fbfa2613dd64bfad7a23c
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由 Islam AbdelRahman 提交于
Summary: When doing a Seek() or SeekForPrev() we should stop the moment we see a key with a different prefix as start if ReadOptions:: prefix_same_as_start was set to true Right now we don't stop if we encounter a tombstone outside the prefix while executing SeekForPrev() Closes https://github.com/facebook/rocksdb/pull/3067 Differential Revision: D6149638 Pulled By: IslamAbdelRahman fbshipit-source-id: 7f659862d2bf552d3c9104a360c79439ceba2f18
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- 25 10月, 2017 1 次提交
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由 zach shipko 提交于
Summary: A few simple changes to allow RocksDB to be built on OpenBSD. Let me know if any further changes are needed. Closes https://github.com/facebook/rocksdb/pull/3061 Differential Revision: D6138800 Pulled By: ajkr fbshipit-source-id: a13a17b5dc051e6518bd56a8c5efd1d24dd81b0c
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- 24 10月, 2017 4 次提交
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由 zawlazaw 提交于
Summary: Java's `Status.SubCode` was out of sync with `include/rocksdb/status.h:SubCode`. When running out of disc space this led to an `IllegalArgumentException` because of an invalid status code, rather than just returning the corresponding status code without an exception. I added the missing status codes. By this, we keep the behaviour of throwing an `IllegalArgumentException` in case of newly added status codes that are defined in C but not in Java. We could think of an alternative strategy: add in Java another code "UnknownCode" which acts as a catch-all for all those status codes that are not yet mirrored from C to Java. This approach would never throw an exception but simply return a non-OK status-code. I think the current approach of throwing an Exception in case of a C/Java inconsistency is fine, but if you have some opinion on the alternative strategy, then feel free to comment here. Closes https://github.com/facebook/rocksdb/pull/3050 Differential Revision: D6129682 Pulled By: sagar0 fbshipit-source-id: f2bf44caad650837cffdcb1f93eb793b43580c66
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由 Yi Wu 提交于
Summary: With FIFO compaction we would like to get the oldest data time for monitoring. The problem is we don't have timestamp for each key in the DB. As an approximation, we expose the earliest of sst file "creation_time" property. My plan is to override the property with a more accurate value with blob db, where we actually have timestamp. Closes https://github.com/facebook/rocksdb/pull/2842 Differential Revision: D5770600 Pulled By: yiwu-arbug fbshipit-source-id: 03833c8f10bbfbee62f8ea5c0d03c0cafb5d853a
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由 Dmitri Smirnov 提交于
Summary: MSVC does not support unused attribute at this time. A separate assignment line fixes the issue probably by being counted as usage for MSVC and it no longer complains about unused var. Closes https://github.com/facebook/rocksdb/pull/3048 Differential Revision: D6126272 Pulled By: maysamyabandeh fbshipit-source-id: 4907865db45fd75a39a15725c0695aaa17509c1f
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由 Maysam Yabandeh 提交于
Summary: Enable concurrent_prepare flag for WritePrepared transactions and extend the existing transaction tests with this config. Closes https://github.com/facebook/rocksdb/pull/3046 Differential Revision: D6106534 Pulled By: maysamyabandeh fbshipit-source-id: 88c8d21d45bc492beb0a131caea84a2ac5e7d38c
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- 21 10月, 2017 6 次提交
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由 Sagar Vemuri 提交于
Summary: This test shouldn't be enabled under the lite version; and this fixes the failing contrun test due to #3006. Closes https://github.com/facebook/rocksdb/pull/3056 Differential Revision: D6114681 Pulled By: sagar0 fbshipit-source-id: dc5243549ae6b1353cec7edb820c771d95f66dda
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由 Maysam Yabandeh 提交于
Summary: The test currently times out when it is run under tsan. This patch split it into 4 tests. Closes https://github.com/facebook/rocksdb/pull/3047 Differential Revision: D6106515 Pulled By: maysamyabandeh fbshipit-source-id: 03a28cdf8b1c097be2361b1b0cc3dc1acf2b5d63
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由 Andrew Kryczka 提交于
Summary: Add options to `db_stress` (correctness testing tool) to randomly acquire snapshot and release it after some period of time. It's useful for correctness testing of #3009, as well as other parts of compaction that behave differently depending on which snapshots are held. Closes https://github.com/facebook/rocksdb/pull/3038 Differential Revision: D6086501 Pulled By: ajkr fbshipit-source-id: 3ec0d8666c78ac507f1f808887c4ff759ba9b865
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由 Andrew Kryczka 提交于
Summary: fixup 6a541afc. This code didn't do anything because (1) `bytes_per_sync` is assigned in `EnvOptions`'s constructor; and (2) `OptimizeForCompactionTableWrite`'s return value was ignored, even though its only purpose is to return something. Closes https://github.com/facebook/rocksdb/pull/3055 Differential Revision: D6114132 Pulled By: ajkr fbshipit-source-id: ea4831770930e9cf83518e13eb2e1934d1f5487c
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由 Andrew Kryczka 提交于
Summary: We should mention these: - `EventListener::OnStallConditionsChanged()` in 01542400 - `DeleteRange()` fix in 966b32b5 Closes https://github.com/facebook/rocksdb/pull/3054 Differential Revision: D6113989 Pulled By: ajkr fbshipit-source-id: d5e058e1ab07570df22936e8d5939fb30fb4d381
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由 raistlin 提交于
Summary: Fix unstable floating point exception, tested on Windows, 64-bit build. The problem appeared in `SetCapacity()` method at line `high_pri_pool_capacity_ = capacity_ * high_pri_pool_ratio_;` `high_pri_pool_ratio_` was not initialized at that moment, because `SetHighPriorityPoolRatio()` is called after `SetCapacity()`. So, `high_pri_pool_ratio_` contained garbage, which caused "Floating point exception" sometimes. Closes https://github.com/facebook/rocksdb/pull/3052 Differential Revision: D6111161 Pulled By: yiwu-arbug fbshipit-source-id: d170329111ad12b4bf9bbcf37bcb6411523438ae
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- 20 10月, 2017 2 次提交
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由 Sagar Vemuri 提交于
Summary: ColumnFamilyOptions::compaction_options_fifo and all its sub-fields can be set dynamically now. Some of the ways in which the fifo compaction options can be set are: - `SetOptions({{"compaction_options_fifo", "{max_table_files_size=1024}"}})` - `SetOptions({{"compaction_options_fifo", "{ttl=600;}"}})` - `SetOptions({{"compaction_options_fifo", "{max_table_files_size=1024;ttl=600;}"}})` - `SetOptions({{"compaction_options_fifo", "{max_table_files_size=51;ttl=49;allow_compaction=true;}"}})` Most of the code has been made generic enough so that it could be reused later to make universal options (and other such nested defined-types) dynamic with very few lines of parsing/serializing code changes. Introduced a few new functions like `ParseStruct`, `SerializeStruct` and `GetStringFromStruct`. The duplicate code in `GetStringFromDBOptions` and `GetStringFromColumnFamilyOptions` has been moved into `GetStringFromStruct`. So they become just simple wrappers now. Closes https://github.com/facebook/rocksdb/pull/3006 Differential Revision: D6058619 Pulled By: sagar0 fbshipit-source-id: 1e8f78b3374ca5249bb4f3be8a6d3bb4cbc52f92
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由 Dmitri Smirnov 提交于
Summary: Closes https://github.com/facebook/rocksdb/pull/3018 Differential Revision: D6079011 Pulled By: yiwu-arbug fbshipit-source-id: 988a721e7e7617967859dba71d660fc69f4dff57
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- 19 10月, 2017 2 次提交
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由 Sagar Vemuri 提交于
Summary: Update RocksDB Authors File. Reviewed By: yiwu-arbug Differential Revision: D6075453 fbshipit-source-id: dff52f483aab33c41de391f145a8273acfd6cbde
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由 Gihwan Oh 提交于
Summary: instad of for specific level -> instead of a specific level Closes https://github.com/facebook/rocksdb/pull/3040 Differential Revision: D6090811 Pulled By: sagar0 fbshipit-source-id: 499edef0a6f596c448f61791e6aca8f5cce08e9c
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