maokaihe/mini_lsm
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finish week 1 day 3+4 block/sst

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Signed-off-by: Alex Chi Z <iskyzh@gmail.com>
This commit is contained in:
Alex Chi Z
2024-01-21 14:21:09 +08:00
parent f88394a686
commit 9eb197114d
9 changed files with 237 additions and 39 deletions
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22
mini-lsm/src/table.rs
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@@ -73,8 +73,6 @@ impl BlockMeta {
}
/// A file object.
///
/// Before day 4, it should look like:
pub struct FileObject(Option<File>, u64);
impl FileObject {
@@ -111,7 +109,7 @@ impl FileObject {
pub struct SsTable {
file: FileObject,
block_metas: Vec<BlockMeta>,
block_meta: Vec<BlockMeta>,
block_meta_offset: usize,
id: usize,
block_cache: Option<Arc<BlockCache>>,
@@ -131,12 +129,12 @@ impl SsTable {
let raw_meta_offset = file.read(len - 4, 4)?;
let block_meta_offset = (&raw_meta_offset[..]).get_u32() as u64;
let raw_meta = file.read(block_meta_offset, len - 4 - block_meta_offset)?;
let block_metas = BlockMeta::decode_block_meta(&raw_meta[..]);
let block_meta = BlockMeta::decode_block_meta(&raw_meta[..]);
Ok(Self {
file,
first_key: block_metas.first().unwrap().first_key.clone(),
last_key: block_metas.last().unwrap().last_key.clone(),
block_metas,
first_key: block_meta.first().unwrap().first_key.clone(),
last_key: block_meta.last().unwrap().last_key.clone(),
block_meta,
block_meta_offset: block_meta_offset as usize,
id,
block_cache,
@@ -147,7 +145,7 @@ impl SsTable {
pub fn create_meta_only(id: usize, file_size: u64, first_key: Bytes, last_key: Bytes) -> Self {
Self {
file: FileObject(None, file_size),
block_metas: vec![],
block_meta: vec![],
block_meta_offset: 0,
id,
block_cache: None,
@@ -158,9 +156,9 @@ impl SsTable {
/// Read a block from the disk.
pub fn read_block(&self, block_idx: usize) -> Result<Arc<Block>> {
let offset = self.block_metas[block_idx].offset;
let offset = self.block_meta[block_idx].offset;
let offset_end = self
.block_metas
.block_meta
.get(block_idx + 1)
.map_or(self.block_meta_offset, |x| x.offset);
let block_data = self
@@ -183,14 +181,14 @@ impl SsTable {
/// Find the block that may contain `key`.
pub fn find_block_idx(&self, key: &[u8]) -> usize {
self.block_metas
self.block_meta
.partition_point(|meta| meta.first_key <= key)
.saturating_sub(1)
}
/// Get number of data blocks.
pub fn num_of_blocks(&self) -> usize {
self.block_metas.len()
self.block_meta.len()
}
pub fn first_key(&self) -> &Bytes {