[Remote Translog] Introduce remote translog with upload functionality #5392

gbbafna · 2022-11-28T15:31:26Z

This is the first PR for remote translog support in OpenSearch .

The scope of the PR is just uploading translog files - tlog and ckp .

Signed-off-by: Gaurav Bafna [email protected]

Description

[Describe what this change achieves]

Issues Resolved

#5477

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 · 2022-11-28T15:56:01Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/7384/
CommitID: 04148a0
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?

sachinpkale · 2022-12-02T05:26:38Z

server/src/main/java/org/opensearch/index/translog/LocalTranslog.java

+import java.util.function.LongConsumer;
+import java.util.function.LongSupplier;
+
+public class LocalTranslog extends Translog {


Assuming the implementation details are not changed and these methods are just moved out of Translog.

Yes. There are no changes to LocalTranslog .

sachinpkale · 2022-12-02T05:28:54Z

server/src/main/java/org/opensearch/index/translog/InternalTranslogFactory.java

@@ -29,7 +29,7 @@ public Translog newTranslog(
        LongConsumer persistedSequenceNumberConsumer
    ) throws IOException {

-        return new Translog(
+        return new LocalTranslog(


nit: Should the class name be also changed to LocalTranslogFactory?

Thanks Sachin .I will make this change in follow up PR along with introduction of RemoteTranslogFactory.

sachinpkale · 2022-12-05T04:19:48Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+    public void sync() throws IOException {
+        try {
+            if (syncToDisk()) {
+                prepareAndUpload(primaryTermSupplier.getAsLong(), null);


if upload fails, how does it impact the operations already synced to local translog?

We would not rollback those changes. Local translog can contain unacked changes for a while and be ahead of Remote Translog . However on next upload, these operations would also get uploaded to remote. So local and remote would be in sync again . This is the current behavior of translog as well, where it can persist unacknowledged writes.

If upload fails we should ensure we are failing the request acknowledgement

Ack. Previously we were not doing that. Have added that handling and added UTs as well.

sachinpkale · 2022-12-05T04:29:31Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+            fileTransferTracker::exclusionFilter
+        );
+        try {
+            final Checkpoint checkpoint = readCheckpoint(location);


As this method is not overridden, does it mean it will always read checkpoint from local?

We will need to change this once we have the readCheckpoint from remote . Ideally on restart of the process , we want to read from local to minimize the bootup time. In rest of the cases, we want to download from remote to local and then do readCheckpoint . I will put up a ToDo for same.

Can we try to ensure that files are always in sync with the remote store at all times, we can avoid downloading if checksums match to boost recovery times.

sachinpkale · 2022-12-05T04:33:57Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+        prepareAndUpload(primaryTermSupplier.getAsLong(), null);
+    }
+
+    private boolean prepareAndUpload(Long primaryTerm, Long generation) throws IOException {


Does prepareAndUpload upload only the latest sync'd tarnslog and checkpoint files? Does it assume existence of previous files in remote translog?

No it doesn't . It uploads the difference b/w local and remote stores. The transferSnapshotProvider factors in all the local translog and checkpoint files and uses FileTransferTracker to know the already uploaded files.

sachinpkale · 2022-12-05T04:42:47Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+    @Override
+    public void sync() throws IOException {
+        try {
+            if (syncToDisk()) {


As syncToDisk() is called before uploading translog files to remote, does it mean RemoteFsTranslog has dependency over LocalTranslog? Is this a decorator pattern, where we can combine 2 Translog implementations?

All the common dependencies are still in Translog. Hence RemoteFsTranslog doesn't depend upon LocalTranslog . You can argue that RemoteFsTranslog can extend LocalTranslog for now . But we have kept it separate for now as we might plan to not do a local sync at all and directly upload to remote store . And the evolution of RemoteFsTranslog will make it quite different from LocalTranslog.

ashking94 · 2022-12-07T11:06:10Z

server/src/main/java/org/opensearch/index/translog/BufferedChecksumStreamInput.java

@@ -120,7 +120,7 @@ public void reset() throws IOException {
    public int read() throws IOException {
        try {
            return readByte() & 0xFF;
-        } catch (EOFException e) {
+        } catch (EOFException | ArrayIndexOutOfBoundsException e) {


Why would ArrayIndexOutOfBoundsException occur?

When the read of the byte array is completed, AIOB is thrown and not EOF .

Which byte array? Can you provide more detail about what is happening here? This doesn't strike me as the right place to fix the problem because it looks like this is covering up a behavior of a specific StreamInput, unless I'm misunderstanding something here.

Sorry, I meant BytesStreamInput . Yes, you are right . BytesStreamInput can throw AIOOBE not EOF . Hence , I added the handling for same .

OpenSearch/server/src/main/java/org/opensearch/common/io/stream/BytesStreamInput.java

Lines 83 to 87 in 306b199

// NOTE: AIOOBE not EOF if you read too much

@Override

public byte readByte() {

return bytes[pos++];

}

I agree to your concerns. Ideally BytesStreamInput should not throw AIOOBE, but return EOF . However modifying that can cause regressions in other places. Hence I am inclined to keep it as is for that reason. Let me know if you have any concerns regarding same.

OpenSearch/server/src/main/java/org/opensearch/common/io/stream/StreamInput.java

Lines 129 to 132 in 306b199

/**

* Reads and returns a single byte.

*/

public abstract byte readByte() throws IOException;

The problem here is that any StreamInput can be given to BufferedChecksumStreamInput. In any other case array index out of bounds could very well be a bug and this will just interpret it as end of file. I don't understand the reason for not throwing an EOFException, other than this is a copy from the corresponding Lucene class.

I'm inclined to fix the problem at the source rather than doing this for the reason cited above. Also, this is not a comprehensive fix...readBytes() and read() will continue to throw ArrayIndexOutOfBoundsException.

Got it . I have fixed BytesStreamInput now to return EOF instead of AIOOBE just like other implementations of StreamInput .

ashking94 · 2022-12-07T11:09:58Z

server/src/main/java/org/opensearch/index/translog/LocalTranslog.java

+    ) throws IOException {
+        super(config, translogUUID, deletionPolicy, globalCheckpointSupplier, primaryTermSupplier, persistedSequenceNumberConsumer);
+        try {
+            final Checkpoint checkpoint = readCheckpoint(location);


Should we abstract readCheckpoint as well as this would be different for different Translog Implementation and might not be required for the other implementations?

Currently we are reading only from local , hence keeping it as of now. We can make this change later, when we introduce a different Translog Implementation which needs a different readCheckpoint

@gbbafna this might be needed for replicas while doing replica-primary promotion - fyi.

ashking94 · 2022-12-07T11:12:06Z

server/src/main/java/org/opensearch/index/translog/LocalTranslog.java

+     *                                 that a new generation is rolled when the term is increased. This guarantee allows to us to validate
+     *                                 and reject operation whose term is higher than the primary term stored in the translog header.
+     * @param persistedSequenceNumberConsumer a callback that's called whenever an operation with a given sequence number is successfully
+     *                                        persisted.


pls add to the class java doc @opensearch.internal

ashking94 · 2022-12-07T11:21:35Z

server/src/main/java/org/opensearch/index/translog/Translog.java

@@ -112,7 +111,7 @@
 *
 * @opensearch.internal
 */
-public class Translog extends AbstractIndexShardComponent implements IndexShardComponent, Closeable {
+public abstract class Translog extends AbstractIndexShardComponent implements IndexShardComponent, Closeable {


Going through the Translog class, it still is heavily tied to local filesystem. Is it possible to have abstractions such that we could have a Translog class which is agnostic to Local/Remote store and then a LocalTranslog and RemoteLocalTranslog so that we could have right abstractions when we want to become remote completely?

This would be a big change and not needed urgently. Hence. we want to defer it as of now as we still write to local and then upload to remote . Downloading puts in local and then reads from local .

ashking94 · 2022-12-07T11:27:26Z

server/src/main/java/org/opensearch/index/translog/LocalTranslog.java

+        try (ReleasableLock ignored = readLock.acquire()) {
+            if (location.generation == current.getGeneration()) { // if we have a new one it's already synced
+                ensureOpen();
+                return current.syncUpTo(location.translogLocation + location.size);


TranslogWrite also seems to be tied heavily with local disk. Is it possible to have an abstraction (TranslogWriter) here and an LocalTranslogWriter implementation that does required job. For RemoteLocalTranslog, the implementation could be again and extension of LocalTranslogWriter or some something similar?

Agreed to your concerns . Currently we are doing this way as this is faster and safer way to release a working Remote Translog. Post our performance runs, if we see syncing to local disk is a significant performance hit, we will take that abstraction work , which is quite a significant work in itself.

ashking94

I think we could do more on getting the right abstractions here.

sachinpkale · 2022-12-09T06:10:30Z

Fixing Gradle Precommit failure.

github-actions · 2022-12-09T07:30:38Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/7820/
CommitID: a9895a7
Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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github-actions · 2022-12-09T08:01:58Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/7821/
CommitID: 7c72f4d
Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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github-actions · 2022-12-09T09:36:04Z

Gradle Check (Jenkins) Run Completed with:

RESULT: FAILURE ❌
URL: https://build.ci.opensearch.org/job/gradle-check/7823/
CommitID: 593f3fb
Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
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Signed-off-by: Gaurav Bafna <[email protected]>

github-actions · 2022-12-22T11:21:00Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/8345/
CommitID: ea33f76

gbbafna · 2022-12-22T11:23:24Z

Overall changes look good to me. Few things:

1. Fix the build

2. Write PR title using imperative mood (we use squash and merge policy while merging. This makes PR title as commit message of merged PR)

3. Complete the checklist in the PR description

Thanks Sachin. Completed all of the above.

Build got fixed by the rebase.

Signed-off-by: Gaurav Bafna <[email protected]>

github-actions · 2022-12-23T12:59:45Z

Gradle Check (Jenkins) Run Completed with:

RESULT: SUCCESS ✅
URL: https://build.ci.opensearch.org/job/gradle-check/8389/
CommitID: 38f3a41

ashking94

lgtm

Bukhtawar · 2022-12-27T05:20:28Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+        if (current.totalOperations() == 0 && primaryTermSupplier.getAsLong() == current.getPrimaryTerm()) {
+            return;
+        }
+        prepareAndUpload(primaryTermSupplier.getAsLong(), null);


While ensureSynced uploads within a writeLock is this true even for rollGeneration. To ensure exactly one upload can happen at any point in time we need to ensure that the write lock is held by the current thread. Can we add those checks

prepareAndUpload already does a writeLock acquire, which will guarantee that exactly one thread will be uploading the txlog files. Since Translog has a ReentrantReadWriteLock , it will ensure that only thread will be able to take the write log, and other threads will lie dormant, till the write lock is released .

Bukhtawar · 2022-12-27T05:23:03Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+            // Do we need remote writes in sync fashion ?
+            // If we don't , we should swallow FileAlreadyExistsException while writing to remote store
+            // and also verify for same during primary-primary relocation
+            // Writing remote in sync fashion doesn't hurt as global ckp update
+            // is not updated in remote translog except in primary to primary recovery.


nit: Do we need a ToDo here, the comments aren't clear. We do need remote writes in sync, while the same file should be prevented from getting uploaded in the first place and if it cannot then we need to check if that got overridden on the remote store

Bukhtawar · 2022-12-27T05:24:16Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+        }
+    }
+
+    private boolean upload(Long primaryTerm, Long generation) throws IOException {


Maybe check if lock is held by current thread. Please also add multi-threaded tests to ensure that replication requests and flush request don't get into concurrency issues

Bukhtawar · 2022-12-27T05:39:10Z

server/src/main/java/org/opensearch/index/translog/RemoteFsTranslog.java

+                    if (ex instanceof IOException) {
+                        throw (IOException) ex;
+                    } else {
+                        throw (RuntimeException) ex;
+                    }


Why not just throw the underlying exception?

Bukhtawar

Thanks @gbbafna LGTM

…opensearch-project#5392) * Introduce remote translog with upload functionality Signed-off-by: Gaurav Bafna <[email protected]> Co-authored-by: Bukhtawar Khan <[email protected]>

opensearch-trigger-bot · 2023-01-09T07:55:17Z

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-5392-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 5cfae6e05ad3a686d32e0769a2b4c2749ed24e89
# Push it to GitHub
git push --set-upstream origin backport/backport-5392-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-5392-to-2.x.

…opensearch-project#5392) * Introduce remote translog with upload functionality Signed-off-by: Gaurav Bafna <[email protected]> Co-authored-by: Bukhtawar Khan <[email protected]>

…hanges (#5757) * Introduce TranslogFactory for Local/Remote Translog support (#4172) * Introduce TranslogFactory for Local/Remote Translog support Signed-off-by: Bukhtawar Khan <[email protected]> * [Remote Translog] Introduce remote translog with upload functionality (#5392) * Introduce remote translog with upload functionality Signed-off-by: Gaurav Bafna <[email protected]> Co-authored-by: Bukhtawar Khan <[email protected]> * Enable creation of indices using Remote Translog (#5638) * Enable creation of indices using Remote Translog behind a setting and feature flag Signed-off-by: Gaurav Bafna <[email protected]> * [Remote Translog] Add support for downloading files from remote translog (#5649) * Add support to download translog from remote store during recovery Signed-off-by: Sachin Kale <[email protected]> * Integrate remote translog download on failover (#5699) * Integrate remote translog download on failover Signed-off-by: Ashish Singh <[email protected]> Signed-off-by: Bukhtawar Khan <[email protected]> Signed-off-by: Gaurav Bafna <[email protected]> Signed-off-by: Sachin Kale <[email protected]> Signed-off-by: Ashish Singh <[email protected]>

…hanges (opensearch-project#5757) * Introduce TranslogFactory for Local/Remote Translog support (opensearch-project#4172) * Introduce TranslogFactory for Local/Remote Translog support Signed-off-by: Bukhtawar Khan <[email protected]> * [Remote Translog] Introduce remote translog with upload functionality (opensearch-project#5392) * Introduce remote translog with upload functionality Signed-off-by: Gaurav Bafna <[email protected]> Co-authored-by: Bukhtawar Khan <[email protected]> * Enable creation of indices using Remote Translog (opensearch-project#5638) * Enable creation of indices using Remote Translog behind a setting and feature flag Signed-off-by: Gaurav Bafna <[email protected]> * [Remote Translog] Add support for downloading files from remote translog (opensearch-project#5649) * Add support to download translog from remote store during recovery Signed-off-by: Sachin Kale <[email protected]> * Integrate remote translog download on failover (opensearch-project#5699) * Integrate remote translog download on failover Signed-off-by: Ashish Singh <[email protected]> Signed-off-by: Bukhtawar Khan <[email protected]> Signed-off-by: Gaurav Bafna <[email protected]> Signed-off-by: Sachin Kale <[email protected]> Signed-off-by: Ashish Singh <[email protected]>

* Introduce TranslogFactory for Local/Remote Translog support (#4172) * Introduce TranslogFactory for Local/Remote Translog support Signed-off-by: Bukhtawar Khan <[email protected]> * [Remote Translog] Introduce remote translog with upload functionality (#5392) * Introduce remote translog with upload functionality Signed-off-by: Gaurav Bafna <[email protected]> Co-authored-by: Bukhtawar Khan <[email protected]> * Enable creation of indices using Remote Translog (#5638) * Enable creation of indices using Remote Translog behind a setting and feature flag Signed-off-by: Gaurav Bafna <[email protected]> * [Remote Translog] Add support for downloading files from remote translog (#5649) * Add support to download translog from remote store during recovery Signed-off-by: Sachin Kale <[email protected]> * Integrate remote translog download on failover (#5699) * Integrate remote translog download on failover Signed-off-by: Ashish Singh <[email protected]> Signed-off-by: Bukhtawar Khan <[email protected]> Signed-off-by: Gaurav Bafna <[email protected]> Signed-off-by: Sachin Kale <[email protected]> Signed-off-by: Ashish Singh <[email protected]> Signed-off-by: Bukhtawar Khan <[email protected]> Signed-off-by: Gaurav Bafna <[email protected]> Signed-off-by: Sachin Kale <[email protected]> Signed-off-by: Ashish Singh <[email protected]> Co-authored-by: Gaurav Bafna <[email protected]>

…hanges (#5757) * Introduce TranslogFactory for Local/Remote Translog support (#4172) * Introduce TranslogFactory for Local/Remote Translog support Signed-off-by: Bukhtawar Khan <[email protected]> * [Remote Translog] Introduce remote translog with upload functionality (#5392) * Introduce remote translog with upload functionality Signed-off-by: Gaurav Bafna <[email protected]> Co-authored-by: Bukhtawar Khan <[email protected]> * Enable creation of indices using Remote Translog (#5638) * Enable creation of indices using Remote Translog behind a setting and feature flag Signed-off-by: Gaurav Bafna <[email protected]> * [Remote Translog] Add support for downloading files from remote translog (#5649) * Add support to download translog from remote store during recovery Signed-off-by: Sachin Kale <[email protected]> * Integrate remote translog download on failover (#5699) * Integrate remote translog download on failover Signed-off-by: Ashish Singh <[email protected]> Signed-off-by: Bukhtawar Khan <[email protected]> Signed-off-by: Gaurav Bafna <[email protected]> Signed-off-by: Sachin Kale <[email protected]> Signed-off-by: Ashish Singh <[email protected]>

gbbafna requested review from a team and reta as code owners November 28, 2022 15:31

gbbafna marked this pull request as draft November 28, 2022 15:31

sachinpkale reviewed Dec 5, 2022

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sachinpkale mentioned this pull request Dec 6, 2022

[Remote Store] Add support for refresh level durability #5253

Merged

6 tasks

Bukhtawar changed the title ~~[Remote Translog] [Draft] - Changes to upload remote translog~~ [Remote Translog] - Changes to upload remote translog Dec 7, 2022

ashking94 reviewed Dec 7, 2022

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ashking94 requested changes Dec 7, 2022

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gbbafna marked this pull request as ready for review December 9, 2022 04:12

sachinpkale force-pushed the remote-txlog-upload-core branch from 593f3fb to 33104a1 Compare December 12, 2022 10:45

sachinpkale requested review from anasalkouz, andrross, Bukhtawar, CEHENKLE, dblock, setiah, kartg, kotwanikunal, mch2 and nknize as code owners December 12, 2022 10:45

gbbafna added 5 commits December 22, 2022 16:17

Updating close and not uploading older generation

8d6a1ce

Signed-off-by: Gaurav Bafna <[email protected]>

Failure handling for remote txlog and associated UTs

a10b4a7

Signed-off-by: Gaurav Bafna <[email protected]>

Addressing PR Comments

7ef31a1

Signed-off-by: Gaurav Bafna <[email protected]>

Fixing spotless failures

40c03f1

Signed-off-by: Gaurav Bafna <[email protected]>

Moving recoverFromFiles to Translog class

ea33f76

Signed-off-by: Gaurav Bafna <[email protected]>

gbbafna force-pushed the remote-txlog-upload-core branch from aa7e4f2 to ea33f76 Compare December 22, 2022 10:48

sachinpkale approved these changes Dec 22, 2022

View reviewed changes

Throwing EOF from BytesStreamInput if read too much

38f3a41

Signed-off-by: Gaurav Bafna <[email protected]>

ashking94 approved these changes Dec 26, 2022

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Bukhtawar reviewed Dec 27, 2022

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Bukhtawar approved these changes Dec 27, 2022

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Bukhtawar merged commit 5cfae6e into opensearch-project:main Dec 27, 2022

gbbafna deleted the remote-txlog-upload-core branch December 28, 2022 12:30

gbbafna added the backport 2.x Backport to 2.x branch label Jan 9, 2023

This was referenced Jan 9, 2023

[Backport 2.x] Support Remote Translog Functionality #5755

Closed

[Backport 2.x] Adding Remote translog upload, download and failover changes #5757

Merged

	// NOTE: AIOOBE not EOF if you read too much
	@Override
	public byte readByte() {
	return bytes[pos++];
	}

	/**
	* Reads and returns a single byte.
	*/
	public abstract byte readByte() throws IOException;

[Remote Translog] Introduce remote translog with upload functionality #5392

[Remote Translog] Introduce remote translog with upload functionality #5392

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gbbafna commented Nov 28, 2022 • edited Loading

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