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Clean up some parts of the code

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Clément Renault 2024-07-03 17:17:19 +02:00
parent 4ceade43cd
commit fd8c90b858
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GPG Key ID: F250A4C4E3AE5F5F
1 changed files with 21 additions and 15 deletions
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36
milli/src/update/index_documents/mod.rs
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@ -566,13 +566,9 @@ where
word_fid_docids.map(MergerBuilder::build),
)?;
// TODO increase this number to 10k and put it in a const somewhere
// I don't like that this dangerous condition is here...
if number_of_documents > 10_000
&& self.index.document_compression_dictionary(self.wtxn)?.is_none()
{
self.manage_compression_dictionary()?;
}
// This call contains an internal condition to ensure we do not always
// generate compression dictionaries and always compress documents.
self.manage_compression_dictionary()?;
Ok(number_of_documents)
}
@ -767,32 +763,42 @@ where
name = "compress_documents_database"
)]
pub fn manage_compression_dictionary(&mut self) -> Result<()> {
/// The size of the dictionary generated from a sample of the documents already
/// in the database. It will be used when compressing and decompressing documents.
const COMPRESSION_DICTIONARY_SIZE: usize = 64_000;
/// The minimum number of documents to trigger the generation of the compression dictionary.
const COMPRESSION_ON_NUMBER_OF_DOCUMENTS: usize = 10_000;
if self.index.number_of_documents(self.wtxn)? < COMPRESSION_ON_NUMBER_OF_DOCUMENTS as u64
|| self.index.document_compression_dictionary(self.wtxn)?.is_some()
{
return Ok(());
}
let mut sample_file = tempfile::tempfile().map(BufWriter::new)?;
let mut sample_sizes = Vec::new();
// TODO make this 1_000 be 10k and const
let documents = self.index.documents.remap_types::<BEU32, Bytes>();
for result in documents.iter(self.wtxn)?.take(10_000) {
for result in documents.iter(self.wtxn)?.take(COMPRESSION_ON_NUMBER_OF_DOCUMENTS) {
let (_id, bytes) = result?;
sample_file.write_all(bytes)?;
sample_sizes.push(bytes.len());
}
// TODO manage this unwrap correctly
let sample_file = sample_file.into_inner().unwrap();
let sample_file = sample_file.into_inner().map_err(|ie| ie.into_error())?;
let sample_data = unsafe { memmap2::Mmap::map(&sample_file)? };
// TODO make this 64_000 const
let dictionary = zstd::dict::from_continuous(&sample_data, &sample_sizes, 64_000)?;
let dictionary =
zstd::dict::from_continuous(&sample_data, &sample_sizes, COMPRESSION_DICTIONARY_SIZE)?;
self.index.put_document_compression_dictionary(self.wtxn, &dictionary)?;
// safety: We just set the dictionary above, it must be there when we get it back.
// safety: We just set the dictionary above. It must be there when we get it back.
let dictionary = self.index.document_compression_dictionary(self.wtxn)?.unwrap();
// TODO do not remap types here but rather expose the &[u8] for the KvReaderU16
let mut iter = self.index.documents.iter_mut(self.wtxn)?;
while let Some(result) = iter.next() {
let (docid, document) = result?;
let document = document.as_non_compressed().as_bytes();
let compressed = CompressedKvWriterU16::new_with_dictionary(document, &dictionary)?;
// safety the compressed document is entirely owned
// safety: the compressed document is entirely owned
unsafe {
iter.put_current_with_options::<CompressedObkvCodec>(
PutFlags::empty(),