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reduceErrs to handle context.Canceled errors (#13670)

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With this change, reduceErrs will group all errors due to 
context cancelation as the same.

e.g, Following are errors due to context cancelation seen 
from 3 remote disks. Their error values are different but 
they are all caused due to the same context cancelation.

['Post
"http://minio2:9000/minio/storage/data1/v37/statvol?disk-id=101cbc99-f5d2-4a9d-b18b-97e872b3e4a7&volume=mybucket":
context canceled',
 'Post
 "http://minio3:9000/minio/storage/data1/v37/statvol?disk-id=7a84474b-a4fd-4b80-8aab-d308a587c280&volume=mybucket":
 context canceled',
 'Post
 "http://minio4:9000/minio/storage/data1/v37/statvol?disk-id=d60d571a-83c8-487d-9e14-beebc94682d2&volume=mybucket":
 context canceled']
This commit is contained in:
Krishnan Parthasarathi 2021-11-16 15:26:48 -08:00 committed by GitHub
parent 661b263e77
commit 367cb48096
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 0 deletions
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5
cmd/erasure-metadata-utils.go
View File

@ -39,6 +39,11 @@ func reduceErrs(errs []error, ignoredErrs []error) (maxCount int, maxErr error)
if IsErrIgnored(err, ignoredErrs...) {
continue
}
// Errors due to context cancelation may be wrapped - group them by context.Canceled.
if errors.Is(err, context.Canceled) {
errorCounts[context.Canceled]++
continue
}
errorCounts[err]++
}

6
cmd/erasure-metadata-utils_test.go
View File

@ -54,6 +54,10 @@ func TestDiskCount(t *testing.T) {
// Test for reduceErrs, reduceErr reduces collection
// of errors into a single maximal error with in the list.
func TestReduceErrs(t *testing.T) {
canceledErrs := make([]error, 0, 5)
for i := 0; i < 5; i++ {
canceledErrs = append(canceledErrs, fmt.Errorf("error %d: %w", i, context.Canceled))
}
// List all of all test cases to validate various cases of reduce errors.
testCases := []struct {
errs []error
@ -86,6 +90,8 @@ func TestReduceErrs(t *testing.T) {
{[]error{errFileNotFound, errFileNotFound, errFileNotFound,
errFileNotFound, errFileNotFound, nil, nil, nil, nil, nil},
nil, nil},
// Checks if wrapped context cancelation errors are grouped as one.
{canceledErrs, nil, context.Canceled},
}
// Validates list of all the testcases for returning valid errors.
for i, testCase := range testCases {