fix: allow delayed etcd updates to have fallbacks

[harshavardhana]

Description

fix: allow delayed etcd updates to have fallbacks

Motivation and Context

fixes #11149

How to test this PR?

As per the reproducer in #11149

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Documentation needed
• Unit tests needed

[kannappanr]

LGTM

[poornas]

LGTM

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-gateway-s3.sh	✔️
mint-erasure.sh	✔️
mint-dist-erasure.sh	✔️
mint-zoned.sh	✔️
mint-gateway-nas.sh	✔️
mint-gateway-azure.sh	❌ more...

11151-068b44d/mint-gateway-azure.sh.log:

Running with
SERVER_ENDPOINT:      minio-dev7.minio.io:31977
ACCESS_KEY:           minioazure
SECRET_KEY:           ***REDACTED***
ENABLE_HTTPS:         0
SERVER_REGION:        us-east-1
MINT_DATA_DIR:        /mint/data
MINT_MODE:            full
ENABLE_VIRTUAL_STYLE: 0

To get logs, run 'docker cp b77fea22c00d:/mint/log /tmp/mint-logs'

(1/15) Running aws-sdk-go tests ... done in 9 seconds
(2/15) Running aws-sdk-java tests ... done in 1 seconds
(3/15) Running aws-sdk-php tests ... done in 1 minutes and 23 seconds
(4/15) Running aws-sdk-ruby tests ... done in 21 seconds
(5/15) Running awscli tests ... done in 2 minutes and 43 seconds
(6/15) Running healthcheck tests ... done in 0 seconds
(7/15) Running mc tests ... done in 3 minutes and 33 seconds
(8/15) Running minio-dotnet tests ... done in 1 minutes and 38 seconds
(9/15) Running minio-go tests ... FAILED in 1 minutes and 48 seconds
{
  "args": {
    "bucketName": "minio-go-test-wdmuwysxjeamuhtl",
    "objectName": "test-object",
    "opts": "",
    "size": -1
  },
  "duration": 1037,
  "function": "PutObject(bucketName, objectName, reader,size,opts)",
  "message": "Unexpected size",
  "name": "minio-go: testPutObjectStreaming",
  "status": "FAIL"
}
(9/15) Running minio-java tests ... FAILED in 8 minutes and 52 seconds
{
  "name": "minio-java",
  "function": "putObject()",
  "args": "[user metadata]",
  "duration": 171,
  "status": "FAIL",
  "error": "error occurred\nErrorResponse(code = AuthenticationFailed, message = -> github.com/Azure/azure-storage-blob-go/azblob.newStorageError, github.com/Azure/azure-storage-blob-go@v0.10.0/azblob/zc_storage_error.go:42\n===== RESPONSE ERROR (ServiceCode=AuthenticationFailed) =====\nDescription=Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.\nRequestId:ebe95239-d01e-00d0-7bb7-df514c000000\nTime:2020-12-31T20:53:33.1352389Z, Details: \n   AuthenticationErrorDetail: The MAC signature found in the HTTP request 'xMI+jVKoz9+toTqqIJ2NylFuSMPGJProAobQTkdYwe0=' is not the same as any computed signature. Server used following string to sign: 'PUT\n\n\n128\n\napplication/xml\n\n\n\n\n\n\nx-ms-blob-cache-control:\nx-ms-blob-content-disposition:\nx-ms-blob-content-encoding:\nx-ms-blob-content-language:\nx-ms-blob-content-type:application/octet-stream\nx-ms-client-request-id:63ff2d21-107a-445f-4c09-b9d90ecf8108\nx-ms-date:Thu, 31 Dec 2020 20:53:33 GMT\nx-ms-meta-my_header1:a   b   c\nx-ms-meta-my_header2:\"a   b   c\"\nx-ms-meta-my_project:Project One\nx-ms-meta-my_unicode_tag:商å“�\nx-ms-version:2019-02-02\n/minioazure/minio-java-test-f97kvi/minio-java-test-22os0pb\ncomp:blocklist\ntimeout:1501'.\n   Code: AuthenticationFailed\n   PUT https://minioazure.blob.core.windows.net/minio-java-test-f97kvi/minio-java-test-22os0pb?comp=blocklist&timeout=1501\n   Authorization: REDACTED\n   Content-Length: [128]\n   Content-Type: [application/xml]\n   User-Agent: [APN/1.0 MinIO/1.0 MinIO/2020-12-31T20:26:47Z]\n   X-Ms-Blob-Cache-Control: []\n   X-Ms-Blob-Content-Disposition: []\n   X-Ms-Blob-Content-Encoding: []\n   X-Ms-Blob-Content-Language: []\n   X-Ms-Blob-Content-Type: [application/octet-stream]\n   X-Ms-Client-Request-Id: [63ff2d21-107a-445f-4c09-b9d90ecf8108]\n   X-Ms-Date: [Thu, 31 Dec 2020 20:53:33 GMT]\n   X-Ms-Meta-My_header1: [a   b   c]\n   X-Ms-Meta-My_header2: [\"a   b   c\"]\n   X-Ms-Meta-My_project: [Project One]\n   X-Ms-Meta-My_unicode_tag: [商品]\n   X-Ms-Version: [2019-02-02]\n   --------------------------------------------------------------------------------\n   RESPONSE Status: 403 Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.\n   Content-Length: [1091]\n   Content-Type: [application/xml]\n   Date: [Thu, 31 Dec 2020 20:53:32 GMT]\n   Server: [Microsoft-HTTPAPI/2.0]\n   X-Ms-Error-Code: [AuthenticationFailed]\n   X-Ms-Request-Id: [ebe95239-d01e-00d0-7bb7-df514c000000]\n\n\n, bucketName = minio-java-test-f97kvi, objectName = minio-java-test-22os0pb, resource = /minio-java-test-f97kvi/minio-java-test-22os0pb, requestId = 1655E870CBF93CCD, hostId = 79d3798f-3532-4dd6-896d-9b0807ef120c)\nrequest={method=PUT, url=http://minio-dev7.minio.io:31977/minio-java-test-f97kvi/minio-java-test-22os0pb, headers=x-amz-meta-My-Unicode-Tag: 商品\nx-amz-meta-My-Project: Project One\nx-amz-meta-My-header1: a   b   c\nx-amz-meta-My-Header2: \"a   b   c\"\nContent-Type: application/octet-stream\nHost: minio-dev7.minio.io:31977\nAccept-Encoding: identity\nUser-Agent: MinIO (Linux; amd64) minio-java/8.0.3\nContent-MD5: A9oFTxee7YVcJ9fWsgQeKg==\nx-amz-content-sha256: 1ff7959f86334ddc5c188a5083268f600146328b2b6c5185e75bf7d9387d6b74\nx-amz-date: 20201231T205333Z\nAuthorization: AWS4-HMAC-SHA256 Credential=*REDACTED*/20201231/us-east-1/s3/aws4_request, SignedHeaders=content-md5;host;x-amz-content-sha256;x-amz-date;x-amz-meta-my-header1;x-amz-meta-my-header2;x-amz-meta-my-project;x-amz-meta-my-unicode-tag, Signature=*REDACTED*\n}\nresponse={code=403, headers=Accept-Ranges: bytes\nContent-Length: 3082\nContent-Security-Policy: block-all-mixed-content\nContent-Type: application/xml\nServer: MinIO\nVary: Origin\nX-Amz-Request-Id: 1655E870CBF93CCD\nX-Xss-Protection: 1; mode=block\nDate: Thu, 31 Dec 2020 20:53:33 GMT\n}\n >>> [io.minio.MinioClient.execute(MinioClient.java:775), io.minio.MinioClient.putObject(MinioClient.java:4547), io.minio.MinioClient.putObject(MinioClient.java:2713), io.minio.MinioClient.putObject(MinioClient.java:2830), FunctionalTest.testPutObject(FunctionalTest.java:763), FunctionalTest.putObject(FunctionalTest.java:890), FunctionalTest.runObjectTests(FunctionalTest.java:3751), FunctionalTest.runTests(FunctionalTest.java:3783), FunctionalTest.main(FunctionalTest.java:3927)]"
}
(9/15) Running minio-js tests ... FAILED in 46 seconds
{
  "name": "minio-js",
  "function": "\"after all\" hook in \"functional tests\"",
  "duration": 79,
  "status": "FAIL",
  "error": "S3Error: The bucket you tried to delete is not empty at Object.parseError (node_modules/minio/dist/main/xml-parsers.js:79:11) at /mint/run/core/minio-js/node_modules/minio/dist/main/transformers.js:156:22 at DestroyableTransform._flush (node_modules/minio/dist/main/transformers.js:80:10) at DestroyableTransform.prefinish (node_modules/readable-stream/lib/_stream_transform.js:129:10) at prefinish (node_modules/readable-stream/lib/_stream_writable.js:611:14) at finishMaybe (node_modules/readable-stream/lib/_stream_writable.js:620:5) at endWritable (node_modules/readable-stream/lib/_stream_writable.js:643:3) at DestroyableTransform.Writable.end (node_modules/readable-stream/lib/_stream_writable.js:571:22) at IncomingMessage.onend (internal/streams/readable.js:684:10) at endReadableNT (internal/streams/readable.js:1327:12) at processTicksAndRejections (internal/process/task_queues.js:80:21)"
}
(9/15) Running minio-py tests ... done in 18 minutes and 44 seconds
(10/15) Running s3cmd tests ... done in 2 minutes and 26 seconds
(11/15) Running s3select tests ... done in 45 seconds
(12/15) Running security tests ... done in 0 seconds

Executed 12 out of 15 tests successfully.

Deleting image on docker hub
Deleting image locally

[klauspost]

LGTM