Merge pull request #344 from methyl/patch-1

Allow setting optimize_filters_for_hits and compression_options
master
Jordan Terrell 5 years ago committed by GitHub
commit 9b8486aa44
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  1. 64
      src/db_options.rs

@ -270,6 +270,49 @@ impl Options {
} }
} }
/// Maximum size of dictionaries used to prime the compression library.
/// Enabling dictionary can improve compression ratios when there are
/// repetitions across data blocks.
///
/// The dictionary is created by sampling the SST file data. If
/// `zstd_max_train_bytes` is nonzero, the samples are passed through zstd's
/// dictionary generator. Otherwise, the random samples are used directly as
/// the dictionary.
///
/// When compression dictionary is disabled, we compress and write each block
/// before buffering data for the next one. When compression dictionary is
/// enabled, we buffer all SST file data in-memory so we can sample it, as data
/// can only be compressed and written after the dictionary has been finalized.
/// So users of this feature may see increased memory usage.
///
/// Default: `0`
///
/// # Example
///
/// ```
/// use rocksdb::Options;
///
/// let mut opts = Options::default();
/// opts.set_compression_options(4, 5, 6, 7);
/// ```
pub fn set_compression_options(
&mut self,
w_bits: c_int,
level: c_int,
strategy: c_int,
max_dict_bytes: c_int,
) {
unsafe {
ffi::rocksdb_options_set_compression_options(
self.inner,
w_bits,
level,
strategy,
max_dict_bytes,
);
}
}
/// If non-zero, we perform bigger reads when doing compaction. If you're /// If non-zero, we perform bigger reads when doing compaction. If you're
/// running RocksDB on spinning disks, you should set this to at least 2MB. /// running RocksDB on spinning disks, you should set this to at least 2MB.
/// That way RocksDB's compaction is doing sequential instead of random reads. /// That way RocksDB's compaction is doing sequential instead of random reads.
@ -391,6 +434,27 @@ impl Options {
} }
} }
/// Sets the optimize_filters_for_hits flag
///
/// Default: `false`
///
/// # Example
///
/// ```
/// use rocksdb::Options;
///
/// let mut opts = Options::default();
/// opts.set_optimize_filters_for_hits(true);
/// ```
pub fn set_optimize_filters_for_hits(&mut self, optimize_for_hits: bool) {
unsafe {
ffi::rocksdb_options_set_optimize_filters_for_hits(
self.inner,
optimize_for_hits as c_int,
);
}
}
/// Sets the number of open files that can be used by the DB. You may need to /// Sets the number of open files that can be used by the DB. You may need to
/// increase this if your database has a large working set. Value `-1` means /// increase this if your database has a large working set. Value `-1` means
/// files opened are always kept open. You can estimate number of files based /// files opened are always kept open. You can estimate number of files based

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