export stats_persist_period_sec option and rocksdb_env_set_background_threads

[ailisp]

These are needed if user want to disable all threads in rocksdb. Only set set_max_background_jobs, set_max_background_compactions, set_max_background_flushes to 0 will still leave 4 additional threads. By this in C++ rocksdb it's possible to disable all threads by (tested in lldb):

  options.max_background_jobs = 0; // already have in rust-rocksdb, master
  options.max_background_compactions = 0;  // already have in rust-rocksdb 0.14
  options.max_background_flushes = 0;  // already have in rust-rocksdb 0.14
  options.stats_dump_period_sec = 0;  // already have in rust-rocksdb 0.14
  options.stats_persist_period_sec = 0; // **need export**
  DB* db = nullptr;
  Status s = DB::Open(options, kDBPath, &db);
  Env::Default()->SetBackgroundThreads(0, Env::Priority::BOTTOM); // **need export**
  Env::Default()->SetBackgroundThreads(0, Env::Priority::LOW);
  Env::Default()->SetBackgroundThreads(0, Env::Priority::HIGH);

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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Work has been started.

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Please review their action plans below:

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I would love to work on this project, I have experience with Rust.

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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[developerfred]

@ailisp and @nearmax done the functions have already been published in the master on Facebook/rocksdb

[ailisp]

@ailisp and @nearmax done the functions have already been published in the master on Facebook/rocksdb

Cool! Can you export it in rust-rocksdb (it's okay to submit your fork of rust-rocksdb, bump rocksdb version here: https://github.com/rust-rocksdb/rust-rocksdb/tree/master/librocksdb-sys to include your commit to Facebook/rocksdb)

[developerfred]

@ailisp ok, I will do!
#448 (comment)

[ailisp]

@nearmax @developerfred 's work is fully as we expected, there was a problem on my test (must wait a few seconds so rocksdb shutdown threads) we can release the bounty

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Issue Status: 1. Open 2. Started 3. Submitted 4. Done

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