File System Caching for remote store #5641

aabukhalil · 2022-12-27T09:27:18Z

Signed-off-by: Ahmad AbuKhalil abukhali@amazon.com

Description

Implement FileSystem Tracking LRU Cache with RefCounting
Part of this commit was developed from code and concepts initially implemented
in Amazon OpenSearch Service as part of the UltraWarm feature.

Issues Resolved

#4965

Check List

New functionality includes testing.
- All tests pass
New functionality has been documented.
- New functionality has javadoc added
Commits are signed per the DCO using --signoff
Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

github-actions · 2022-12-27T10:00:53Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testIndexDeletionDuringSnapshotCreationInQueue

URL: https://build.ci.opensearch.org/job/gradle-check/8488/
CommitID: c80e883
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

codecov-commenter · 2022-12-27T10:02:54Z

Codecov Report

Merging #5641 (c80e883) into main (b8c9b9a) will decrease coverage by 0.23%.
The diff coverage is 47.96%.

@@             Coverage Diff              @@
##               main    #5641      +/-   ##
============================================
- Coverage     71.13%   70.90%   -0.24%     
+ Complexity    58648    58630      -18     
============================================
  Files          4759     4773      +14     
  Lines        279468   280088     +620     
  Branches      40343    40394      +51     
============================================
- Hits         198803   198583     -220     
- Misses        64440    65308     +868     
+ Partials      16225    16197      -28

Impacted Files	Coverage Δ
...g/opensearch/common/cache/RemovalNotification.java	`100.00% <ø> (ø)`
...ch/common/cache/refcounted/stats/StatsCounter.java	`0.00% <0.00%> (ø)`
...search/index/store/remote/fc/CachedIndexInput.java	`0.00% <0.00%> (ø)`
...ch/index/store/remote/fc/FileCachedIndexInput.java	`0.00% <0.00%> (ø)`
...dex/store/remote/file/OnDemandBlockIndexInput.java	`73.01% <ø> (ø)`
...indices/fielddata/cache/IndicesFieldDataCache.java	`80.19% <0.00%> (ø)`
...arch/index/store/remote/utils/TransferManager.java	`3.03% <4.76%> (+3.03%)`	⬆️
...pensearch/common/util/ThrowableTranslateUtils.java	`11.11% <11.11%> (ø)`
...rg/opensearch/index/store/remote/fc/FileCache.java	`13.04% <13.04%> (ø)`
...ava/org/opensearch/common/collect/LinkedDeque.java	`29.45% <29.45%> (ø)`
... and 503 more

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andrross · 2023-01-06T16:05:29Z

server/src/main/java/org/opensearch/common/collect/LinkedDeque.java

+ *
+ * @opensearch.internal
+ */
+public final class LinkedDeque<E extends Linked<E>> extends AbstractCollection<E> implements Deque<E> {


Do you know where this implementation comes from? It seems to be widely copied into projects on GitHub.

Really what I'm getting at is whether we need to implement this data structure or if we can use something built into the JDK instead.

Do you know where this implementation comes from? It seems to be widely copied into projects on GitHub.

No, I don't know where this file originally came from. But I see almost all cache implementations (Guava, Caffeine, ...) have this and no I'm not aware of any Java built in alternative

@andrross this copied from [1], which is the predecessor of [2], we should not be doing that (IMHO)

[1] https://github.com/ben-manes/concurrentlinkedhashmap/
[2] https://github.com/ben-manes/caffeine

@reta There's now more details about why we're doing this in #4964. I would love to find a library implementation we can use for this and the caching logic in general, but at the moment we don't have one and I'd like to keep making incremental progress here. #6225 has been opened to track that effort.

Also, for additional context, this and other code in this PR has been adapted from UltraWarm (see the commit message) which is another reason why this implementation is our first approach.

What do you think?

@andrross sure, have a suggestion here (#5641 (comment)) on isolating this code (in separate library)

server/src/main/java/org/opensearch/index/store/remote/utils/TransferManager.java

andrross · 2023-01-17T16:42:30Z

server/src/main/java/org/opensearch/common/cache/refcounted/stats/CacheStats.java

+     * @return the difference between this instance and {@code other}
+     */
+
+    public CacheStats minus(CacheStats other) {


Are the plus() and minus() methods used anywhere?

nope they are not used anywhere for now but there are few more methods which are not used but will be used once cache stats is exposed to nodes stats and maybe plus will be one of them. For now will remove plus and minus and if needed will add them back

Please remove the unused code, methods will be introduced when needed

andrross · 2023-01-17T16:43:25Z

server/src/main/java/org/opensearch/common/cache/refcounted/LRUCache.java

+ * @opensearch.internal
+ */
+class LRUCache<K, V> implements RefCountedCache<K, V> {
+    private long capacity;


Can all these fields be final?

made them final

dblock · 2023-01-23T22:52:25Z

@aabukhalil What are we doing with this PR?

aabukhalil · 2023-01-24T19:43:08Z

@aabukhalil What are we doing with this PR?

new commit should be uploaded today

github-actions · 2023-01-25T02:08:28Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/9867/
CommitID: b940bb0
Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
Is the failure a flaky test unrelated to your change?

andrross · 2023-02-08T21:21:17Z

server/src/main/java/org/opensearch/index/store/remote/utils/cache/CacheUsage.java

+ * compatible open source license.
+ */
+
+package org.opensearch.index.store.remote.utils.cache;


@nknize What do you think about the location for this code? I kind of like keeping it contained here until either it matures a bit or we replace it with something else. But marking it experimental in the opensearch-commons library essentially accomplishes the same thing, so I'm happy to defer to your preference.

I put my thoughts in the comments below..

github-actions · 2023-02-09T00:46:22Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/10888/
CommitID: 49757a5

github-actions · 2023-02-09T00:50:57Z

Gradle Check (Jenkins) Run Completed with:

RESULT: UNSTABLE ❕
TEST FAILURES:

      1 org.opensearch.indices.replication.SegmentReplicationStatsIT.testSegmentReplicationStatsResponse
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

URL: https://build.ci.opensearch.org/job/gradle-check/10889/
CommitID: ff26dde
Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

reta · 2023-02-09T01:13:58Z

This is adding some general purpose caching classes to the :server module

The common namespace was something of a moving target so I suggested keeping it in server until the recent changes were finalized. If we keep the general purpose caching classes then opensearch-common is probably the right place for it.

@andrross @nknize since we are copying a large chunk of specialized code, may be we could move it off to separate module libs/opensearch-cache and not pollute core (or common) with cache implementation? It looks fairly isolated as well, should be doable.

reta · 2023-02-09T01:16:32Z

server/src/main/java/org/opensearch/index/store/remote/utils/cache/SegmentedCache.java

+ */
+public class SegmentedCache<K, V> implements RefCountedCache<K, V> {
+
+    private static final int HASH_BITS = 0x7fffffff; // usable bits of normal ActivenessAwareCache hash


ActivenessAwareCache, some leftovers from UltraWarm need clearing :)

nknize · 2023-02-09T20:47:00Z

...may be we could move it off to separate module libs/opensearch-cache and not pollute core (or common) with cache implementation?

I don't think we want to introduce a whole new opensearch-cache library artifact just yet since it's still very experimental.

...marking it experimental in the opensearch-commons library essentially accomplishes the same thing, so I'm happy to defer to your preference.

I would like to pull it out of :server and into a library so we can prevent tight coupling (inadvertent or not) w/ other classes in the server module but I think it's probably too soon since it's still very much tied to the remote store implementation only.

How about this: could we refactor the entire remote store implementation to a store-remote module in a follow up PR? Then assess whether to move the Cache components to :libs:opensearch-core?

I realize I didn't jump into the original PR conversation and raise the plugin / module question. Since it's already released as a part of 2.5 I think that takes away the plugin option.

nknize · 2023-02-09T19:55:35Z

...rc/internalClusterTest/java/org/opensearch/geo/search/aggregations/bucket/GeoTileGridIT.java

@@ -136,7 +136,7 @@ public void testMultivaluedGeoPointsAggregation() throws Exception {
     *
     * @param geometry           {@link Geometry}
     * @param geoShapeDocValue   {@link GeoShapeDocValue}
-     * @param intersectingWithBB
+     * @param intersectingWithBB enable intersectingWithBB


strange this change crept into this unrelated PR. spotless?

it is failing on gradlew precommit

Are you building with JDK 14? We've seen weirdness with JDK 14 enforcing some javadoc rules in tests.

yes I'm building with JDK 14

nknize · 2023-02-09T20:48:07Z

server/src/main/java/org/opensearch/index/store/remote/utils/cache/CacheUsage.java

+ * compatible open source license.
+ */
+
+package org.opensearch.index.store.remote.utils.cache;


I put my thoughts in the comments below..

andrross · 2023-02-09T21:53:18Z

How about this: could we refactor the entire remote store implementation to a store-remote module in a follow up PR? Then assess whether to move the Cache components to :libs:opensearch-core?

@nknize The generic cache and the more specific "FileCache" components can be moved around quite easily I think. As for making the whole thing a module, I'm sure that's possible but if my understanding is correct we'll have to make sure we have all the necessary extension points in the Plugin interface. I honestly don't know the scope of that but we can definitely explore it.

github-actions · 2023-02-09T22:29:09Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/10967/
CommitID: f3f4f04

nknize · 2023-02-09T23:04:34Z

I'm sure that's possible but if my understanding is correct we'll have to make sure we have all the necessary extension points in the Plugin interface

This sounds like a good follow on PR. I'm happy to help out here as well. Thoughts @reta?

reta · 2023-02-10T00:30:36Z

I'm sure that's possible but if my understanding is correct we'll have to make sure we have all the necessary extension points in the Plugin interface

This sounds like a good follow on PR. I'm happy to help out here as well. Thoughts @reta?

+1 from me as well

andrross · 2023-02-10T00:31:29Z

I'm sure that's possible but if my understanding is correct we'll have to make sure we have all the necessary extension points in the Plugin interface

This sounds like a good follow on PR. I'm happy to help out here as well. Thoughts @reta?

Created #6281 to track this

andrross

I'm good with this PR, though we've got some new items to follow up on going forward.

nknize

🎉 LGTM! Thx all!

Part of this commit was developed from code and concepts initially implemented in Amazon OpenSearch Service as part of the UltraWarm feature. Thank you to the following developers and the entire UltraWarm team. Co-authored-by: Min Zhou <minzho@amazon.com> Co-authored-by: Ankit Malpani <malpani@amazon.com> Co-authored-by: Rohit Nair <rohinair@amazon.com> Co-authored-by: Sorabh Hamirwasia <hsorabh@amazon.com> Co-authored-by: Ankit Jain <akjain@amazon.com> Co-authored-by: Tianru Zhou <tianruz@amazon.com> Co-authored-by: Neetika Singhal <neetiks@amazon.com> Co-authored-by: Amit Khandelwal <mkhnde@amazon.com> Co-authored-by: Vigya Sharma <vigyas@amazon.com> Co-authored-by: Prateek Sharma <shrprat@amazon.com> Co-authored-by: Venkata Jyothsna Donapati <donapv@amazon.com> Co-authored-by: Vlad Rozov <vrozov@amazon.com> Co-authored-by: Mohit Agrawal <agramohi@amazon.com> Co-authored-by: Shweta Thareja <tharejas@amazon.com> Co-authored-by: Palash Hedau <phhedau@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Piyush Daftary <pdaftary@amazon.com> Co-authored-by: Payal Maheshwari <pmaheshw@amazon.com> Co-authored-by: Kunal Khatua <kkhatua@amazon.com> Co-authored-by: Gulshan Kumar <kumargu@amazon.com> Co-authored-by: Rushi Agrawal <agrrushi@amazon.com> Co-authored-by: Ketan Verma <vermketa@amazon.com> Co-authored-by: Gaurav Chandani <chngau@amazon.com> Co-authored-by: Dharmesh Singh <sdharms@amazon.com> Signed-off-by: Ahmad AbuKhalil <abukhali@amazon.com>

github-actions · 2023-02-10T19:10:36Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/11017/
CommitID: c6d46cf

andrross · 2023-02-10T19:45:00Z

Windows precommit failed with an out of memory error, so almost certainly unrelated. Retrying...

opensearch-trigger-bot · 2023-02-10T21:11:11Z

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-5641-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 0ca51a774211184835c4825dfeff38b23198352e
# Push it to GitHub
git push --set-upstream origin backport/backport-5641-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-5641-to-2.x.

…oject#5641) Part of this commit was developed from code and concepts initially implemented in Amazon OpenSearch Service as part of the UltraWarm feature. Thank you to the following developers and the entire UltraWarm team. Co-authored-by: Min Zhou <minzho@amazon.com> Co-authored-by: Ankit Malpani <malpani@amazon.com> Co-authored-by: Rohit Nair <rohinair@amazon.com> Co-authored-by: Sorabh Hamirwasia <hsorabh@amazon.com> Co-authored-by: Ankit Jain <akjain@amazon.com> Co-authored-by: Tianru Zhou <tianruz@amazon.com> Co-authored-by: Neetika Singhal <neetiks@amazon.com> Co-authored-by: Amit Khandelwal <mkhnde@amazon.com> Co-authored-by: Vigya Sharma <vigyas@amazon.com> Co-authored-by: Prateek Sharma <shrprat@amazon.com> Co-authored-by: Venkata Jyothsna Donapati <donapv@amazon.com> Co-authored-by: Vlad Rozov <vrozov@amazon.com> Co-authored-by: Mohit Agrawal <agramohi@amazon.com> Co-authored-by: Shweta Thareja <tharejas@amazon.com> Co-authored-by: Palash Hedau <phhedau@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Piyush Daftary <pdaftary@amazon.com> Co-authored-by: Payal Maheshwari <pmaheshw@amazon.com> Co-authored-by: Kunal Khatua <kkhatua@amazon.com> Co-authored-by: Gulshan Kumar <kumargu@amazon.com> Co-authored-by: Rushi Agrawal <agrrushi@amazon.com> Co-authored-by: Ketan Verma <vermketa@amazon.com> Co-authored-by: Gaurav Chandani <chngau@amazon.com> Co-authored-by: Dharmesh Singh <sdharms@amazon.com> Signed-off-by: Ahmad AbuKhalil <abukhali@amazon.com> (cherry picked from commit 0ca51a7)

…oject#5641) Part of this commit was developed from code and concepts initially implemented in Amazon OpenSearch Service as part of the UltraWarm feature. Thank you to the following developers and the entire UltraWarm team. Co-authored-by: Min Zhou <minzho@amazon.com> Co-authored-by: Ankit Malpani <malpani@amazon.com> Co-authored-by: Rohit Nair <rohinair@amazon.com> Co-authored-by: Sorabh Hamirwasia <hsorabh@amazon.com> Co-authored-by: Ankit Jain <akjain@amazon.com> Co-authored-by: Tianru Zhou <tianruz@amazon.com> Co-authored-by: Neetika Singhal <neetiks@amazon.com> Co-authored-by: Amit Khandelwal <mkhnde@amazon.com> Co-authored-by: Vigya Sharma <vigyas@amazon.com> Co-authored-by: Prateek Sharma <shrprat@amazon.com> Co-authored-by: Venkata Jyothsna Donapati <donapv@amazon.com> Co-authored-by: Vlad Rozov <vrozov@amazon.com> Co-authored-by: Mohit Agrawal <agramohi@amazon.com> Co-authored-by: Shweta Thareja <tharejas@amazon.com> Co-authored-by: Palash Hedau <phhedau@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Piyush Daftary <pdaftary@amazon.com> Co-authored-by: Payal Maheshwari <pmaheshw@amazon.com> Co-authored-by: Kunal Khatua <kkhatua@amazon.com> Co-authored-by: Gulshan Kumar <kumargu@amazon.com> Co-authored-by: Rushi Agrawal <agrrushi@amazon.com> Co-authored-by: Ketan Verma <vermketa@amazon.com> Co-authored-by: Gaurav Chandani <chngau@amazon.com> Co-authored-by: Dharmesh Singh <sdharms@amazon.com> Signed-off-by: Ahmad AbuKhalil <abukhali@amazon.com> (cherry picked from commit 0ca51a7) Signed-off-by: Andrew Ross <andrross@amazon.com>

Part of this commit was developed from code and concepts initially implemented in Amazon OpenSearch Service as part of the UltraWarm feature. Thank you to the following developers and the entire UltraWarm team. Co-authored-by: Min Zhou <minzho@amazon.com> Co-authored-by: Ankit Malpani <malpani@amazon.com> Co-authored-by: Rohit Nair <rohinair@amazon.com> Co-authored-by: Sorabh Hamirwasia <hsorabh@amazon.com> Co-authored-by: Ankit Jain <akjain@amazon.com> Co-authored-by: Tianru Zhou <tianruz@amazon.com> Co-authored-by: Neetika Singhal <neetiks@amazon.com> Co-authored-by: Amit Khandelwal <mkhnde@amazon.com> Co-authored-by: Vigya Sharma <vigyas@amazon.com> Co-authored-by: Prateek Sharma <shrprat@amazon.com> Co-authored-by: Venkata Jyothsna Donapati <donapv@amazon.com> Co-authored-by: Vlad Rozov <vrozov@amazon.com> Co-authored-by: Mohit Agrawal <agramohi@amazon.com> Co-authored-by: Shweta Thareja <tharejas@amazon.com> Co-authored-by: Palash Hedau <phhedau@amazon.com> Co-authored-by: Saurabh Singh <sisurab@amazon.com> Co-authored-by: Piyush Daftary <pdaftary@amazon.com> Co-authored-by: Payal Maheshwari <pmaheshw@amazon.com> Co-authored-by: Kunal Khatua <kkhatua@amazon.com> Co-authored-by: Gulshan Kumar <kumargu@amazon.com> Co-authored-by: Rushi Agrawal <agrrushi@amazon.com> Co-authored-by: Ketan Verma <vermketa@amazon.com> Co-authored-by: Gaurav Chandani <chngau@amazon.com> Co-authored-by: Dharmesh Singh <sdharms@amazon.com> (cherry picked from commit 0ca51a7) Signed-off-by: Ahmad AbuKhalil <abukhali@amazon.com> Signed-off-by: Andrew Ross <andrross@amazon.com> Co-authored-by: Ahmad AbuKhalil <abukhali@amazon.com>

aabukhalil requested review from reta, anasalkouz, andrross, Bukhtawar, CEHENKLE, dblock, setiah, kartg, kotwanikunal, mch2, nknize, owaiskazi19, adnapibar, Rishikesh1159, ryanbogan, saratvemulapalli, shwetathareja, dreamer-89, tlfeng, VachaShah and xuezhou25 as code owners December 27, 2022 09:27

andrross reviewed Jan 6, 2023

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aabukhalil force-pushed the feature/searchable_snapshot_caching_01 branch from c80e883 to b940bb0 Compare January 25, 2023 01:46

aabukhalil requested a review from gbbafna as a code owner January 25, 2023 01:46

andrross reviewed Feb 8, 2023

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aabukhalil force-pushed the feature/searchable_snapshot_caching_01 branch 2 times, most recently from 49757a5 to ff26dde Compare February 9, 2023 00:18

reta reviewed Feb 9, 2023

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nknize reviewed Feb 9, 2023

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anasalkouz linked an issue Feb 9, 2023 that may be closed by this pull request

[Searchable Snapshot] Implement FileSystem Tracking LRU Cache with RefCounting #4965

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aabukhalil force-pushed the feature/searchable_snapshot_caching_01 branch from ff26dde to f3f4f04 Compare February 9, 2023 22:01

andrross mentioned this pull request Feb 10, 2023

[Searchable Snapshot] Investigate modularization of remote searching functionality #6281

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andrross approved these changes Feb 10, 2023

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nknize approved these changes Feb 10, 2023

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aabukhalil force-pushed the feature/searchable_snapshot_caching_01 branch from f3f4f04 to c6d46cf Compare February 10, 2023 18:39

andrross merged commit 0ca51a7 into opensearch-project:main Feb 10, 2023

andrross mentioned this pull request Feb 10, 2023

[Backport 2.x] Implement file system caching for searchable snapshots (#5641) #6290

Merged

6 tasks

adnapibar mentioned this pull request Feb 16, 2023

Include file cache stats in node stats api response #6333

Merged

6 tasks

File System Caching for remote store #5641

File System Caching for remote store #5641

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aabukhalil commented Dec 27, 2022 • edited Loading

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