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| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::HashSet; |
| <span class="kw">use </span>std::ops::Deref; |
| <span class="kw">use </span>std::sync::{Arc, Mutex, Weak}; |
| <span class="kw">use </span>std::thread::JoinHandle; |
| <span class="kw">use </span>std::time::Duration; |
| |
| <span class="kw">use crate</span>::{Executor, Inventory, Searcher, SearcherGeneration, TantivyError}; |
| |
| <span class="kw">pub const </span>GC_INTERVAL: Duration = Duration::from_secs(<span class="number">1</span>); |
| |
| <span class="doccomment">/// `Warmer` can be used to maintain segment-level state e.g. caches. |
| /// |
| /// They must be registered with the [`IndexReaderBuilder`](super::IndexReaderBuilder). |
| </span><span class="kw">pub trait </span>Warmer: Sync + Send { |
| <span class="doccomment">/// Perform any warming work using the provided [`Searcher`]. |
| </span><span class="kw">fn </span>warm(<span class="kw-2">&</span><span class="self">self</span>, searcher: <span class="kw-2">&</span>Searcher) -> <span class="kw">crate</span>::Result<()>; |
| |
| <span class="doccomment">/// Discards internal state for any [`SearcherGeneration`] not provided. |
| </span><span class="kw">fn </span>garbage_collect(<span class="kw-2">&</span><span class="self">self</span>, live_generations: <span class="kw-2">&</span>[<span class="kw-2">&</span>SearcherGeneration]); |
| } |
| |
| <span class="doccomment">/// Warming-related state with interior mutability. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>WarmingState(Arc<Mutex<WarmingStateInner>>); |
| |
| <span class="kw">impl </span>WarmingState { |
| <span class="kw">pub fn </span>new( |
| num_warming_threads: usize, |
| warmers: Vec<Weak<<span class="kw">dyn </span>Warmer>>, |
| searcher_generation_inventory: Inventory<SearcherGeneration>, |
| ) -> <span class="kw">crate</span>::Result<<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(<span class="self">Self</span>(Arc::new(Mutex::new(WarmingStateInner { |
| num_warming_threads, |
| warmers, |
| gc_thread: <span class="prelude-val">None</span>, |
| warmed_generation_ids: Default::default(), |
| searcher_generation_inventory, |
| })))) |
| } |
| |
| <span class="doccomment">/// Start tracking a new generation of [`Searcher`], and [`Warmer::warm`] it if there are active |
| /// warmers. |
| /// |
| /// A background GC thread for [`Warmer::garbage_collect`] calls is uniquely created if there |
| /// are active warmers. |
| </span><span class="kw">pub fn </span>warm_new_searcher_generation(<span class="kw-2">&</span><span class="self">self</span>, searcher: <span class="kw-2">&</span>Searcher) -> <span class="kw">crate</span>::Result<()> { |
| <span class="self">self</span>.<span class="number">0 |
| </span>.lock() |
| .unwrap() |
| .warm_new_searcher_generation(searcher, <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span>) |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">fn </span>gc_maybe(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.lock().unwrap().gc_maybe() |
| } |
| } |
| |
| <span class="kw">struct </span>WarmingStateInner { |
| num_warming_threads: usize, |
| warmers: Vec<Weak<<span class="kw">dyn </span>Warmer>>, |
| gc_thread: <span class="prelude-ty">Option</span><JoinHandle<()>>, |
| <span class="comment">// Contains all generations that have been warmed up. |
| // This list is used to avoid triggers the individual Warmer GCs |
| // if no warmed generation needs to be collected. |
| </span>warmed_generation_ids: HashSet<u64>, |
| searcher_generation_inventory: Inventory<SearcherGeneration>, |
| } |
| |
| <span class="kw">impl </span>WarmingStateInner { |
| <span class="doccomment">/// Start tracking provided searcher as an exemplar of a new generation. |
| /// If there are active warmers, warm them with the provided searcher, and kick background GC |
| /// thread if it has not yet been kicked. Otherwise, prune state for dropped searcher |
| /// generations inline. |
| </span><span class="kw">fn </span>warm_new_searcher_generation( |
| <span class="kw-2">&mut </span><span class="self">self</span>, |
| searcher: <span class="kw-2">&</span>Searcher, |
| this: <span class="kw-2">&</span>Arc<Mutex<<span class="self">Self</span>>>, |
| ) -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span>warmers = <span class="self">self</span>.pruned_warmers(); |
| <span class="comment">// Avoid threads (warming as well as background GC) if there are no warmers |
| </span><span class="kw">if </span>warmers.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| <span class="self">self</span>.start_gc_thread_maybe(this)<span class="question-mark">?</span>; |
| <span class="self">self</span>.warmed_generation_ids |
| .insert(searcher.generation().generation_id()); |
| warming_executor(<span class="self">self</span>.num_warming_threads.min(warmers.len()))<span class="question-mark">? |
| </span>.map(|warmer| warmer.warm(searcher), warmers.into_iter())<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="doccomment">/// Attempt to upgrade the weak `Warmer` references, pruning those which cannot be upgraded. |
| /// Return the strong references. |
| </span><span class="kw">fn </span>pruned_warmers(<span class="kw-2">&mut </span><span class="self">self</span>) -> Vec<Arc<<span class="kw">dyn </span>Warmer>> { |
| <span class="kw">let </span>strong_warmers = <span class="self">self |
| </span>.warmers |
| .iter() |
| .flat_map(|weak_warmer| weak_warmer.upgrade()) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="self">self</span>.warmers = strong_warmers.iter().map(Arc::downgrade).collect(); |
| strong_warmers |
| } |
| |
| <span class="doccomment">/// [`Warmer::garbage_collect`] active warmers if some searcher generation is observed to have |
| /// been dropped. |
| </span><span class="kw">fn </span>gc_maybe(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="kw">let </span>live_generations = <span class="self">self</span>.searcher_generation_inventory.list(); |
| <span class="kw">let </span>live_generation_ids: HashSet<u64> = live_generations |
| .iter() |
| .map(|searcher_generation| searcher_generation.generation_id()) |
| .collect(); |
| <span class="kw">let </span>gc_not_required = <span class="self">self |
| </span>.warmed_generation_ids |
| .iter() |
| .all(|warmed_up_generation| live_generation_ids.contains(warmed_up_generation)); |
| <span class="kw">if </span>gc_not_required { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="kw">let </span>live_generation_refs = live_generations |
| .iter() |
| .map(Deref::deref) |
| .collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">for </span>warmer <span class="kw">in </span><span class="self">self</span>.pruned_warmers() { |
| warmer.garbage_collect(<span class="kw-2">&</span>live_generation_refs); |
| } |
| <span class="self">self</span>.warmed_generation_ids = live_generation_ids; |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="doccomment">/// Start GC thread if one has not already been started. |
| </span><span class="kw">fn </span>start_gc_thread_maybe(<span class="kw-2">&mut </span><span class="self">self</span>, this: <span class="kw-2">&</span>Arc<Mutex<<span class="self">Self</span>>>) -> <span class="kw">crate</span>::Result<bool> { |
| <span class="kw">if </span><span class="self">self</span>.gc_thread.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">false</span>); |
| } |
| <span class="kw">let </span>weak_inner = Arc::downgrade(this); |
| <span class="kw">let </span>handle = std::thread::Builder::new() |
| .name(<span class="string">"tantivy-warm-gc"</span>.to_owned()) |
| .spawn(|| <span class="self">Self</span>::gc_loop(weak_inner)) |
| .map_err(|<span class="kw">_</span>| { |
| TantivyError::SystemError(<span class="string">"Failed to spawn warmer GC thread"</span>.to_owned()) |
| })<span class="question-mark">?</span>; |
| <span class="self">self</span>.gc_thread = <span class="prelude-val">Some</span>(handle); |
| <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>) |
| } |
| |
| <span class="doccomment">/// Every [`GC_INTERVAL`] attempt to GC, with panics caught and logged using |
| /// [`std::panic::catch_unwind`]. |
| </span><span class="kw">fn </span>gc_loop(inner: Weak<Mutex<WarmingStateInner>>) { |
| <span class="kw">for _ in </span>crossbeam_channel::tick(GC_INTERVAL) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = inner.upgrade() { |
| <span class="comment">// rely on deterministic gc in tests |
| </span><span class="attribute">#[cfg(not(test))] |
| </span><span class="kw">if let </span><span class="prelude-val">Err</span>(err) = std::panic::catch_unwind(|| inner.lock().unwrap().gc_maybe()) { |
| <span class="macro">error!</span>(<span class="string">"Panic in Warmer GC {:?}"</span>, err); |
| } |
| <span class="comment">// avoid unused var warning in tests |
| </span><span class="attribute">#[cfg(test)] |
| </span>drop(inner); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">fn </span>warming_executor(num_threads: usize) -> <span class="kw">crate</span>::Result<Executor> { |
| <span class="kw">if </span>num_threads <= <span class="number">1 </span>{ |
| <span class="prelude-val">Ok</span>(Executor::single_thread()) |
| } <span class="kw">else </span>{ |
| Executor::multi_thread(num_threads, <span class="string">"tantivy-warm-"</span>) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>std::collections::HashSet; |
| <span class="kw">use </span>std::sync::atomic::{<span class="self">self</span>, AtomicUsize}; |
| <span class="kw">use </span>std::sync::{Arc, RwLock, Weak}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::Warmer; |
| <span class="kw">use </span><span class="kw">crate</span>::core::searcher::SearcherGeneration; |
| <span class="kw">use </span><span class="kw">crate</span>::directory::RamDirectory; |
| <span class="kw">use </span><span class="kw">crate</span>::schema::{Schema, INDEXED}; |
| <span class="kw">use crate</span>::{Index, IndexSettings, ReloadPolicy, Searcher, SegmentId}; |
| |
| <span class="attribute">#[derive(Default)] |
| </span><span class="kw">struct </span>TestWarmer { |
| active_segment_ids: RwLock<HashSet<SegmentId>>, |
| warm_calls: AtomicUsize, |
| gc_calls: AtomicUsize, |
| } |
| |
| <span class="kw">impl </span>TestWarmer { |
| <span class="kw">fn </span>live_segment_ids(<span class="kw-2">&</span><span class="self">self</span>) -> HashSet<SegmentId> { |
| <span class="self">self</span>.active_segment_ids.read().unwrap().clone() |
| } |
| |
| <span class="kw">fn </span>warm_calls(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.warm_calls.load(atomic::Ordering::Acquire) |
| } |
| |
| <span class="kw">fn </span>gc_calls(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.gc_calls.load(atomic::Ordering::Acquire) |
| } |
| |
| <span class="kw">fn </span>verify( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| expected_warm_calls: usize, |
| expected_gc_calls: usize, |
| expected_segment_ids: HashSet<SegmentId>, |
| ) { |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.warm_calls(), expected_warm_calls); |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.gc_calls(), expected_gc_calls); |
| <span class="macro">assert_eq!</span>(<span class="self">self</span>.live_segment_ids(), expected_segment_ids); |
| } |
| } |
| |
| <span class="kw">impl </span>Warmer <span class="kw">for </span>TestWarmer { |
| <span class="kw">fn </span>warm(<span class="kw-2">&</span><span class="self">self</span>, searcher: <span class="kw-2">&</span><span class="kw">crate</span>::Searcher) -> <span class="kw">crate</span>::Result<()> { |
| <span class="self">self</span>.warm_calls.fetch_add(<span class="number">1</span>, atomic::Ordering::SeqCst); |
| <span class="kw">for </span>reader <span class="kw">in </span>searcher.segment_readers() { |
| <span class="self">self</span>.active_segment_ids |
| .write() |
| .unwrap() |
| .insert(reader.segment_id()); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>garbage_collect(<span class="kw-2">&</span><span class="self">self</span>, live_generations: <span class="kw-2">&</span>[<span class="kw-2">&</span>SearcherGeneration]) { |
| <span class="self">self</span>.gc_calls |
| .fetch_add(<span class="number">1</span>, std::sync::atomic::Ordering::SeqCst); |
| <span class="kw">let </span>active_segment_ids = live_generations |
| .iter() |
| .flat_map(|searcher_generation| searcher_generation.segments().keys().copied()) |
| .collect(); |
| <span class="kw-2">*</span><span class="self">self</span>.active_segment_ids.write().unwrap() = active_segment_ids; |
| } |
| } |
| |
| <span class="kw">fn </span>segment_ids(searcher: <span class="kw-2">&</span>Searcher) -> HashSet<SegmentId> { |
| searcher |
| .segment_readers() |
| .iter() |
| .map(|reader| reader.segment_id()) |
| .collect() |
| } |
| |
| <span class="kw">fn </span>test_warming(num_warming_threads: usize) -> <span class="kw">crate</span>::Result<()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>schema_builder = Schema::builder(); |
| <span class="kw">let </span>field = schema_builder.add_u64_field(<span class="string">"pk"</span>, INDEXED); |
| <span class="kw">let </span>schema = schema_builder.build(); |
| |
| <span class="kw">let </span>directory = RamDirectory::create(); |
| <span class="kw">let </span>index = Index::create(directory, schema, IndexSettings::default())<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>num_writer_threads = <span class="number">4</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>writer = index |
| .writer_with_num_threads(num_writer_threads, <span class="number">25_000_000</span>) |
| .unwrap(); |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0u64</span>..<span class="number">1000u64 </span>{ |
| writer.add_document(<span class="macro">doc!</span>(field => i))<span class="question-mark">?</span>; |
| } |
| writer.commit()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>warmer1 = Arc::new(TestWarmer::default()); |
| <span class="kw">let </span>warmer2 = Arc::new(TestWarmer::default()); |
| warmer1.verify(<span class="number">0</span>, <span class="number">0</span>, HashSet::new()); |
| warmer2.verify(<span class="number">0</span>, <span class="number">0</span>, HashSet::new()); |
| |
| <span class="kw">let </span>num_searchers = <span class="number">4</span>; |
| <span class="kw">let </span>reader = index |
| .reader_builder() |
| .reload_policy(ReloadPolicy::Manual) |
| .num_warming_threads(num_warming_threads) |
| .warmers(<span class="macro">vec!</span>[ |
| Arc::downgrade(<span class="kw-2">&</span>warmer1) <span class="kw">as </span>Weak<<span class="kw">dyn </span>Warmer>, |
| Arc::downgrade(<span class="kw-2">&</span>warmer2) <span class="kw">as </span>Weak<<span class="kw">dyn </span>Warmer>, |
| ]) |
| .try_into()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>warming_state = <span class="kw-2">&</span>reader.inner.warming_state; |
| |
| <span class="kw">let </span>searcher = reader.searcher(); |
| <span class="macro">assert!</span>( |
| !warming_state.gc_maybe(), |
| <span class="string">"no GC after first searcher generation" |
| </span>); |
| warmer1.verify(<span class="number">1</span>, <span class="number">0</span>, segment_ids(<span class="kw-2">&</span>searcher)); |
| warmer2.verify(<span class="number">1</span>, <span class="number">0</span>, segment_ids(<span class="kw-2">&</span>searcher)); |
| <span class="macro">assert_eq!</span>(searcher.num_docs(), <span class="number">1000</span>); |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">1000u64</span>..<span class="number">2000u64 </span>{ |
| writer.add_document(<span class="macro">doc!</span>(field => i))<span class="question-mark">?</span>; |
| } |
| writer.commit()<span class="question-mark">?</span>; |
| writer.wait_merging_threads()<span class="question-mark">?</span>; |
| |
| drop(warmer1); |
| |
| <span class="kw">let </span>old_searcher = searcher; |
| |
| reader.reload()<span class="question-mark">?</span>; |
| |
| <span class="macro">assert!</span>(!warming_state.gc_maybe(), <span class="string">"old searcher still around"</span>); |
| |
| <span class="kw">let </span>searcher = reader.searcher(); |
| <span class="macro">assert_eq!</span>(searcher.num_docs(), <span class="number">2000</span>); |
| |
| warmer2.verify( |
| <span class="number">2</span>, |
| <span class="number">0</span>, |
| segment_ids(<span class="kw-2">&</span>old_searcher) |
| .union(<span class="kw-2">&</span>segment_ids(<span class="kw-2">&</span>searcher)) |
| .copied() |
| .collect(), |
| ); |
| |
| drop(old_searcher); |
| <span class="kw">for _ in </span><span class="number">0</span>..num_searchers { |
| <span class="comment">// make sure the old searcher is dropped by the pool too |
| </span><span class="kw">let _ </span>= reader.searcher(); |
| } |
| <span class="macro">assert!</span>(warming_state.gc_maybe(), <span class="string">"old searcher dropped"</span>); |
| |
| warmer2.verify(<span class="number">2</span>, <span class="number">1</span>, segment_ids(<span class="kw-2">&</span>searcher)); |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>warming_single_thread() -> <span class="kw">crate</span>::Result<()> { |
| test_warming(<span class="number">1</span>) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>warming_four_threads() -> <span class="kw">crate</span>::Result<()> { |
| test_warming(<span class="number">4</span>) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
