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[Remote Translog] Add support for downloading files from remote translog #5649

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merged 12 commits into from
Jan 4, 2023

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sachinpkale
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@sachinpkale sachinpkale commented Dec 28, 2022

Description

  • Add support to download .tlg and .ckp files from remote translog.
  • Also integrated the download flow with restore API.

Issues Resolved

[List any issues this PR will resolve]

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.

@sachinpkale
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This Draft PR is built on #5638. Once the parent PR is merged, I will rebase the branch and will change the PR state to Ready for review.

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Gradle Check (Jenkins) Run Completed with:

@sachinpkale sachinpkale force-pushed the remote-txlog-download-flow branch from 422f993 to 80da036 Compare December 28, 2022 15:13
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Gradle Check (Jenkins) Run Completed with:

@@ -3082,7 +3082,14 @@ public void startRecovery(
executeRecovery("from store", recoveryState, recoveryListener, this::recoverFromStore);
break;
case REMOTE_STORE:
executeRecovery("from remote store", recoveryState, recoveryListener, this::restoreFromRemoteStore);
final Repository remoteTranslogRepo;
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@ashking94 ashking94 Dec 28, 2022

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we could set remoteTranslogRepo as null here and then get rid of else block?

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is it possible to push down some of this logic to restoreFromRemoteStore method?

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remoteTranslogRepo needs to be final as it is provided as argument to a lambda, so we can't initialize it twice.

restoreFromRemoteStore does not have reference to repositoriesService to fetch the repository.

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Can we please use Optional instead?

Comment on lines 500 to 466
if (repository != null) {
FileTransferTracker fileTransferTracker = new FileTransferTracker(shardId);
assert repository instanceof BlobStoreRepository : "repository should be instance of BlobStoreRepository";
BlobStoreRepository blobStoreRepository = (BlobStoreRepository) repository;
TranslogTransferManager translogTransferManager = new TranslogTransferManager(
new BlobStoreTransferService(
blobStoreRepository.blobStore(),
indexShard.getThreadPool().executor(ThreadPool.Names.TRANSLOG_TRANSFER)
),
blobStoreRepository.basePath().add(shardId.getIndex().getUUID()).add(String.valueOf(shardId.id())),
fileTransferTracker,
fileTransferTracker::exclusionFilter
);
RemoteFsTranslog.download(translogTransferManager, indexShard.shardPath().resolveTranslog());
}

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shall we move this to a method syncTranslogFromRemoteTranslogStore for ease of read?

Files.delete(file);
}
Map<String, String> generationToPrimaryTermMapper = translogMetadata.getGenerationToPrimaryTermMapper();
for (long i = translogMetadata.getGeneration(); i >= translogMetadata.getMinTranslogGeneration(); i--) {
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if segments upload is lagging, then just downloading the most recent translog might not be enough. Can we create a tracking issue? If it exists already, pls do share.

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Already tracking it here: #3754

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More details are present in #5567 .

Comment on lines 135 to 163
public boolean downloadTranslog(String primaryTerm, String generation, Path location, boolean latest) throws IOException {
logger.info("Downloading translog files with: Primry Term = {}, Generation = {}, Location = {}", primaryTerm, generation, location);
String checkpointFilename = "translog-" + generation + ".ckp";
if (latest) {
checkpointFilename = "translog.ckp";
}
if (Files.exists(location.resolve(checkpointFilename)) == false) {
try (
InputStream checkpointFileInputStream = transferService.downloadBlob(
remoteBaseTransferPath.add(primaryTerm),
"translog-" + generation + ".ckp"
)
) {
Files.copy(checkpointFileInputStream, location.resolve(checkpointFilename));
}
}
String translogFilename = "translog-" + generation + ".tlog";
if (Files.exists(location.resolve(translogFilename)) == false) {
try (
InputStream translogFileInputStream = transferService.downloadBlob(
remoteBaseTransferPath.add(primaryTerm),
"translog-" + generation + ".tlog"
)
) {
Files.copy(translogFileInputStream, location.resolve(translogFilename));
}
}
return true;
}
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can we do something like this -

     public boolean downloadTranslog(String primaryTerm, String generation, Path location, boolean latest) throws IOException {
        logger.info("Downloading translog files with: Primry Term = {}, Generation = {}, Location = {}", primaryTerm, generation, location);
        String ckpFileName = "translog-" + generation + ".ckp";
        if (latest) {
            String ckpWithoutGenerationFileName = "translog.ckp";
            downloadToFS(ckpFileName, ckpWithoutGenerationFileName, location, primaryTerm);
        }
        // Download Checkpoint file from remote and store on FS
        downloadToFS(ckpFileName, location, primaryTerm);
        // Download translog file from remote and store on FS
        String translogFilename = "translog-" + generation + ".tlog";
        downloadToFS(translogFilename, location, primaryTerm);
        return true;
    }

   private void downloadToFS(String fileName, Path location, String primaryTerm) throws IOException {
        downloadToFS(fileName, fileName, location, primaryTerm);
    }

    private void downloadToFS(String remoteFileName, String localFileName, Path location, String primaryTerm) throws IOException {
        if (Files.exists(location.resolve(localFileName)) == false) {
            try (InputStream inputStream = transferService.downloadBlob(remoteBaseTransferPath.add(primaryTerm), remoteFileName)) {
                Files.copy(inputStream, location.resolve(localFileName));
            }
        }
    }

Comment on lines 152 to 167
private static class MetadataFilenameComparator implements Comparator<String> {
@Override
public int compare(String metadaFilename1, String metadaFilename2) {
// Format of metadata filename is <Primary Term>__<Generation>__<Timestamp>
String[] filenameTokens1 = metadaFilename1.split(METADATA_SEPARATOR);
String[] filenameTokens2 = metadaFilename2.split(METADATA_SEPARATOR);
for (int i = 0; i < filenameTokens1.length; i++) {
if (filenameTokens1[i].equals(filenameTokens2[i]) == false) {
return (int) (Long.parseLong(filenameTokens1[i]) - Long.parseLong(filenameTokens2[i]));
}
}
return 0;
}
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can we add a WARN log here - we should not come across such situation where 2 metadata file comparison yield 0. Also, could we add log when we have to resolve to timestamp for comparing? I dont think using timestamp is fair as clocks are not synchronised across the nodes in the distributed system setup.

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Totally agree with @ashking94's concerns here. However, putting WARN statements in a comparator could lead to craziness in the log. We don't really have control over how many times and against which pairs of files the sort algorithm will invoke the comparison. Is there somewhere else we can add these statements?

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I was also not inclined to add the log in the compare method as it may not provide good debug insights. But as I think more, both the cases: comparing timestamp as well as returning 0 should happen in exceptional cases (we think it should not happen at all). Also, it is not feasible to add this logic in upload flow as it means reading the last uploaded file each time. IMO, we should add these logs in this method. Thoughts?

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2 metadata file comparison yield 0. : This will never happen , as there can't be two files with same name in a remote directory .

Timestamp comparison is a tricky thing here - We can check this in upload flow as it has FileTransferTracker . However , we don't add metadata files in that . Alternate is we just throw RuntimeException from readMetadata() ? This is better than logs (we can miss it ) and silent failures

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The expectation is that two files with the same primary term and generation should never exist, right? If so, then can we just not include the timestamp in the filename? Then it would fail at upload time, when the file was generated that violated the expected invariant, which seems better than failing hard here (because I think the system would end up stuck because it would keep hitting this same error until something changed).

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@sachinpkale in case of a primary-primary relocation, the _ can be same or will be different for the xlog upload? If yes, then failing upload might as well be not correct.

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The expectation is that two files with the same primary term and generation should never exist, right?

This should be extremely rare but should still technically possible for isolated writers during primary-primary relocation like what @sachinpkale mentioned. The timestamp serves as a discriminator in all those cases, based on a last writer wins policy.

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Looks fine on high level, pls make the necessary changes.

Files.delete(file);
}
Map<String, String> generationToPrimaryTermMapper = translogMetadata.getGenerationToPrimaryTermMapper();
for (long i = translogMetadata.getGeneration(); i >= translogMetadata.getMinTranslogGeneration(); i--) {
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More details are present in #5567 .

Map<String, String> generationToPrimaryTermMapper = translogMetadata.getGenerationToPrimaryTermMapper();
for (long i = translogMetadata.getGeneration(); i >= translogMetadata.getMinTranslogGeneration(); i--) {
String generation = Long.toString(i);
translogTransferManager.downloadTranslog(
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We can download tlog files concurrently like uploads . Since this is not in critical write path and exercised only in failver, its okay to take that as a follow up. We can create a ToDo for now.

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Created tracking issue: #5660

@@ -128,6 +132,51 @@ public boolean transferSnapshot(TransferSnapshot transferSnapshot, TranslogTrans
}
}

public boolean downloadTranslog(String primaryTerm, String generation, Path location, boolean latest) throws IOException {
logger.info("Downloading translog files with: Primry Term = {}, Generation = {}, Location = {}", primaryTerm, generation, location);
String checkpointFilename = "translog-" + generation + ".ckp";
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replace translog- with TRANSLOG_FILE_PREFIX , .ckp with CHECKPOINT_SUFFIX, .tlog with TRANSLOG_FILE_SUFFIX .

We can also use Translog#getFilename , Translog#getCommitCheckpointFileName to generate tlog filename .

Comment on lines 138 to 159
if (latest) {
checkpointFilename = "translog.ckp";
}
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We should not put the latest logic here, but handle it inRemoteFsTranslog .

Comment on lines 501 to 512
FileTransferTracker fileTransferTracker = new FileTransferTracker(shardId);
assert repository instanceof BlobStoreRepository : "repository should be instance of BlobStoreRepository";
BlobStoreRepository blobStoreRepository = (BlobStoreRepository) repository;
TranslogTransferManager translogTransferManager = new TranslogTransferManager(
new BlobStoreTransferService(
blobStoreRepository.blobStore(),
indexShard.getThreadPool().executor(ThreadPool.Names.TRANSLOG_TRANSFER)
),
blobStoreRepository.basePath().add(shardId.getIndex().getUUID()).add(String.valueOf(shardId.id())),
fileTransferTracker,
fileTransferTracker::exclusionFilter
);
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should we move this to RemoteFSTranslog#download ? Creating translogTransferManager, fileTransferTracker etc is responsibility of RemoteFSTranslog only .

We can then try to move the common parts of the ctor and download into separate functions.

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The problem is RemoteFsTranslog#download is static method. Even if we create the instances of tracker in download method, we will not be able to re-use it in RemoteFsTranslog.

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I agree on that , but at least the logic of creation of fileTransferTracker, translogTransferManager will reside in RemoteFSTranslog only . We will not be reuse the instances, but reuse the code .

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In this case, do we assume that FileTransferTracker and TranslogTransferManager should not be initialized outside RemoteFsTranslog? Currently, they are public classes so can be instantiated outside.

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When we perform a translog metadata download, we perform a remote store LIST, we need to ensure that we are paginating if needed(we should avoid any pagination by ensuring the LIST starts with the most recent blob) but not paginating deep to ensure performance. I guess this needs additional handling if not already addressed elsewhere

As I understand, pagination is handled in the repository specific implementation (I have verified this in repository-S3).
The concern regarding too many entries and impact on performance is valid. This can be handled by very aggressive purging of translog metadata files (a background thread runs every X secs and clean up all the entries but last Y)

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gbbafna commented Jan 3, 2023

When we perform a translog metadata download, we perform a remote store LIST, we need to ensure that we are paginating if needed(we should avoid any pagination by ensuring the LIST starts with the most recent blob) but not paginating deep to ensure performance. I guess this needs additional handling if not already addressed elsewhere

As I understand, pagination is handled in the repository specific implementation (I have verified this in repository-S3). The concern regarding too many entries and impact on performance is valid. This can be handled by very aggressive purging of translog metadata files (a background thread runs every X secs and clean up all the entries but last Y)

With #5662 and its associated ToDo in #5677 , we will be cleaning up the metadata files with every flush . So it should get taken care of automatically.

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With #5662 and its associated ToDo in #5677 , we will be cleaning up the metadata files with every flush . So it should get taken care of automatically.

This would definitely help, but still we won't be able to have any control on the number of files created since the last commit.

Sachin Kale added 12 commits January 4, 2023 14:10
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
@sachinpkale sachinpkale force-pushed the remote-txlog-download-flow branch from eaec42a to d2b2611 Compare January 4, 2023 09:16
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github-actions bot commented Jan 4, 2023

Gradle Check (Jenkins) Run Completed with:

@sachinpkale sachinpkale requested a review from Bukhtawar January 4, 2023 09:52
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When we perform a translog metadata download, we perform a remote store LIST, we need to ensure that we are paginating if needed(we should avoid any pagination by ensuring the LIST starts with the most recent blob) but not paginating deep to ensure performance. I guess this needs additional handling if not already addressed elsewhere

As I understand, pagination is handled in the repository specific implementation (I have verified this in repository-S3). The concern regarding too many entries and impact on performance is valid. This can be handled by very aggressive purging of translog metadata files (a background thread runs every X secs and clean up all the entries but last Y)

With #5662 and its associated ToDo in #5677 , we will be cleaning up the metadata files with every flush . So it should get taken care of automatically.

This approach might not be deterministic and download latencies unpredictable depending on what rate we ingest and how many pages we end up in. We need a mechanism to always have the most latest entries in the first page to guarantee high predictability.

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This approach might not be deterministic and download latencies unpredictable depending on what rate we ingest and how many pages we end up in. We need a mechanism to always have the most latest entries in the first page to guarantee high predictability.

Created a tracking issue: #5696

@Bukhtawar Bukhtawar merged commit 28e9b11 into opensearch-project:main Jan 4, 2023
sachinpkale added a commit to sachinpkale/OpenSearch that referenced this pull request Jan 9, 2023
…log (opensearch-project#5649)

* Add support to download translog from remote store during recovery

Signed-off-by: Sachin Kale <kalsac@amazon.com>
gbbafna pushed a commit to gbbafna/OpenSearch that referenced this pull request Jan 9, 2023
…log (opensearch-project#5649)

* Add support to download translog from remote store during recovery

Signed-off-by: Sachin Kale <kalsac@amazon.com>
gbbafna added a commit that referenced this pull request Jan 9, 2023
…hanges (#5757)

* Introduce TranslogFactory for Local/Remote Translog support (#4172)

* Introduce TranslogFactory for Local/Remote Translog support

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>

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

* Introduce remote translog with upload functionality 

Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Co-authored-by: Bukhtawar Khan <bukhtawa@amazon.com>

* 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 <gbbafna@amazon.com>

* [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 <kalsac@amazon.com>

* Integrate remote translog download on failover (#5699)

* Integrate remote translog download on failover

Signed-off-by: Ashish Singh <ssashish@amazon.com>

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>
Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Ashish Singh <ssashish@amazon.com>
sachinpkale pushed a commit to sachinpkale/OpenSearch that referenced this pull request Jan 10, 2023
…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 <bukhtawa@amazon.com>

* [Remote Translog] Introduce remote translog with upload functionality (opensearch-project#5392)

* Introduce remote translog with upload functionality 

Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Co-authored-by: Bukhtawar Khan <bukhtawa@amazon.com>

* 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 <gbbafna@amazon.com>

* [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 <kalsac@amazon.com>

* Integrate remote translog download on failover (opensearch-project#5699)

* Integrate remote translog download on failover

Signed-off-by: Ashish Singh <ssashish@amazon.com>

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>
Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Ashish Singh <ssashish@amazon.com>
gbbafna added a commit that referenced this pull request Jan 10, 2023
* Introduce TranslogFactory for Local/Remote Translog support (#4172)

* Introduce TranslogFactory for Local/Remote Translog support

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>

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

* Introduce remote translog with upload functionality 

Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Co-authored-by: Bukhtawar Khan <bukhtawa@amazon.com>

* 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 <gbbafna@amazon.com>

* [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 <kalsac@amazon.com>

* Integrate remote translog download on failover (#5699)

* Integrate remote translog download on failover

Signed-off-by: Ashish Singh <ssashish@amazon.com>

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>
Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Ashish Singh <ssashish@amazon.com>

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>
Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Ashish Singh <ssashish@amazon.com>
Co-authored-by: Gaurav Bafna <85113518+gbbafna@users.noreply.github.com>
kotwanikunal pushed a commit that referenced this pull request Jan 25, 2023
…hanges (#5757)

* Introduce TranslogFactory for Local/Remote Translog support (#4172)

* Introduce TranslogFactory for Local/Remote Translog support

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>

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

* Introduce remote translog with upload functionality 

Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Co-authored-by: Bukhtawar Khan <bukhtawa@amazon.com>

* 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 <gbbafna@amazon.com>

* [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 <kalsac@amazon.com>

* Integrate remote translog download on failover (#5699)

* Integrate remote translog download on failover

Signed-off-by: Ashish Singh <ssashish@amazon.com>

Signed-off-by: Bukhtawar Khan <bukhtawa@amazon.com>
Signed-off-by: Gaurav Bafna <gbbafna@amazon.com>
Signed-off-by: Sachin Kale <kalsac@amazon.com>
Signed-off-by: Ashish Singh <ssashish@amazon.com>
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