With this change, MinIO's ILM supports transitioning objects to a remote tier.
This change includes support for Azure Blob Storage, AWS S3 compatible object
storage incl. MinIO and Google Cloud Storage as remote tier storage backends.
Some new additions include:
- Admin APIs remote tier configuration management
- Simple journal to track remote objects to be 'collected'
This is used by object API handlers which 'mutate' object versions by
overwriting/replacing content (Put/CopyObject) or removing the version
itself (e.g DeleteObjectVersion).
- Rework of previous ILM transition to fit the new model
In the new model, a storage class (a.k.a remote tier) is defined by the
'remote' object storage type (one of s3, azure, GCS), bucket name and a
prefix.
* Fixed bugs, review comments, and more unit-tests
- Leverage inline small object feature
- Migrate legacy objects to the latest object format before transitioning
- Fix restore to particular version if specified
- Extend SharedDataDirCount to handle transitioned and restored objects
- Restore-object should accept version-id for version-suspended bucket (#12091)
- Check if remote tier creds have sufficient permissions
- Bonus minor fixes to existing error messages
Co-authored-by: Poorna Krishnamoorthy <poorna@minio.io>
Co-authored-by: Krishna Srinivas <krishna@minio.io>
Signed-off-by: Harshavardhana <harsha@minio.io>
instead use expect continue timeout, and have
higher response header timeout, the new higher
timeout satisfies worse case scenarios for total
response time on a CreateFile operation.
Also set the "expect" continue header to satisfy
expect continue timeout behavior.
Some clients seem to cause CreateFile body to be
truncated, leading to no errors which instead
fails with ObjectNotFound on a PUT operation,
this change avoids such failures appropriately.
Signed-off-by: Harshavardhana <harsha@minio.io>
allow restrictions on who can access Prometheus
endpoint, additionally add prometheus as part of
diagnostics canned policy.
Signed-off-by: Harshavardhana <harsha@minio.io>
This commit changes the config/IAM encryption
process. Instead of encrypting config data
(users, policies etc.) with the root credentials
MinIO now encrypts this data with a KMS - if configured.
Therefore, this PR moves the MinIO-KMS configuration (via
env. variables) to a "top-level" configuration.
The KMS configuration cannot be stored in the config file
since it is used to decrypt the config file in the first
place.
As a consequence, this commit also removes support for
Hashicorp Vault - which has been deprecated anyway.
Signed-off-by: Andreas Auernhammer <aead@mail.de>
* fix: pick valid FileInfo additionally based on dataDir
historically we have always relied on modTime
to be consistent and same, we can now add additional
reference to look for the same dataDir value.
A dataDir is the same for an object at a given point in
time for a given version, let's say a `null` version
is overwritten in quorum we do not by mistake pick
up the fileInfo's incorrectly.
* make sure to not preserve fi.Data
Signed-off-by: Harshavardhana <harsha@minio.io>
InfoServiceAccount admin API does not correctly calculate the policy for
a given service account in case if the policy is implied. Fix it.
Signed-off-by: Anis Elleuch <anis@min.io>
avoid potential for duplicates under multi-pool
setup, additionally also make sure CompleteMultipart
is using a more optimal API for uploadID lookup
and never delete the object there is a potential
to create a delete marker during complete multipart.
Signed-off-by: Harshavardhana <harsha@minio.io>
This is an optimization by reducing one extra system call,
and many network operations. This reduction should increase
the performance for small file workloads.
When an error is reported it is ignored and zipping continues with the next object.
However, if there is an error it will write a response to `writeWebErrorResponse(w, err)`, but responses are still being built.
Fixes#12082
Bonus: Exclude common compressed image types.
Thanks to @Alevsk for noticing this nuanced behavior
change between releases from 03-04 to 03-20, make sure
that we handle the legacy path removal as well.
also make sure to close the channel on the producer
side, not in a separate go-routine, this can lead
to races between a writer and a closer.
fixes#12073
This is an optimization to save IOPS. The replication
failures will be re-queued once more to re-attempt
replication. If it still does not succeed, the replication
status is set as `FAILED` and will be caught up on
scanner cycle.
For InfoServiceAccount API, calculating the policy before showing it to
the user was not correctly done (only UX issue, not a security issue)
This commit fixes it.
policy might have an associated mapping with an expired
user key, do not return an error during DeletePolicy
for such situations - proceed normally as its an
expected situation.
This commit introduces a new package `pkg/kms`.
It contains basic types and functions to interact
with various KMS implementations.
This commit also moves KMS-related code from `cmd/crypto`
to `pkg/kms`. Now, it is possible to implement a KMS-based
config data encryption in the `pkg/config` package.
This commit introduces a new package `pkg/fips`
that bundles functionality to handle and configure
cryptographic protocols in case of FIPS 140.
If it is compiled with `--tags=fips` it assumes
that a FIPS 140-2 cryptographic module is used
to implement all FIPS compliant cryptographic
primitives - like AES, SHA-256, ...
In "FIPS mode" it excludes all non-FIPS compliant
cryptographic primitives from the protocol parameters.
- Add 32-bit checksum (32 LSB part of xxhash64) of the serialized metadata.
This will ensure that we always reject corrupted metadata.
- Add automatic repair of inline data, so the data structure can be used.
If data was corrupted, we remove all unreadable entries to ensure that operations
can succeed on the object. Since higher layers add bitrot checks this is not a big problem.
Cannot downgrade to v1.1 metadata, but since that isn't released, no need for a major bump.
only in case of S3 gateway we have a case where we
need to allow for SSE-S3 headers as passthrough,
If SSE-C headers are passed then they are rejected
if KMS is not configured.
This code is necessary for `mc admin update` command
to work with fips compiled binaries, with fips tags
the releaseInfo will automatically point to fips
specific binaries.
This commit fixes a bug in the put-part
implementation. The SSE headers should be
set as specified by AWS - See:
https://docs.aws.amazon.com/AmazonS3/latest/API/API_UploadPart.html
Now, the MinIO server should set SSE-C headers,
like `x-amz-server-side-encryption-customer-algorithm`.
Fixes#11991
locks can get relinquished when Read() sees io.EOF
leading to prematurely closing of the readers
concurrent writes on the same object can have
undesired consequences here when these locks
are relinquished.
EOF may be sent along with data so queue it up and
return it when the buffer is empty.
Also, when reading data without direct io don't add a buffer
that only results in extra memcopy.
Multiple disks from the same set would be writing concurrently.
```
WARNING: DATA RACE
Write at 0x00c002100ce0 by goroutine 166:
github.com/minio/minio/cmd.(*erasureSets).connectDisks.func1()
d:/minio/minio/cmd/erasure-sets.go:254 +0x82f
Previous write at 0x00c002100ce0 by goroutine 129:
github.com/minio/minio/cmd.(*erasureSets).connectDisks.func1()
d:/minio/minio/cmd/erasure-sets.go:254 +0x82f
Goroutine 166 (running) created at:
github.com/minio/minio/cmd.(*erasureSets).connectDisks()
d:/minio/minio/cmd/erasure-sets.go:210 +0x324
github.com/minio/minio/cmd.(*erasureSets).monitorAndConnectEndpoints()
d:/minio/minio/cmd/erasure-sets.go:288 +0x244
Goroutine 129 (finished) created at:
github.com/minio/minio/cmd.(*erasureSets).connectDisks()
d:/minio/minio/cmd/erasure-sets.go:210 +0x324
github.com/minio/minio/cmd.(*erasureSets).monitorAndConnectEndpoints()
d:/minio/minio/cmd/erasure-sets.go:288 +0x244
```
This commit adds a self-test for all bitrot algorithms:
- SHA-256
- BLAKE2b
- HighwayHash
The self-test computes an incremental checksum of pseudo-random
messages. If a bitrot algorithm implementation stops working on
some CPU architecture or with a certain Go version this self-test
will prevent the server from starting and silently corrupting data.
For additional context see: minio/highwayhash#19
Metrics calculation was accumulating inital usage across all nodes
rather than using initial usage only once.
Also fixing:
- bug where all peer traffic was going to the same node.
- reset counters when replication status changes from
PENDING -> FAILED
This PR fixes
- close leaking bandwidth report channel leakage
- remove the closer requirement for bandwidth monitor
instead if Read() fails remember the error and return
error for all subsequent reads.
- use locking for usage-cache.bin updates, with inline
data we cannot afford to have concurrent writes to
usage-cache.bin corrupting xl.meta
implementation in #11949 only catered from single
node, but we need cluster metrics by capturing
from all peers. introduce bucket stats API that
will be used for capturing in-line bucket usage
as well eventually
Current implementation heavily relies on readAllFileInfo
but with the advent of xl.meta inlined with data, we cannot
easily avoid reading data when we are only interested is
updating metadata, this leads to invariably write
amplification during metadata updates, repeatedly reading
data when we are only interested in updating metadata.
This PR ensures that we implement a metadata only update
API at storage layer, that handles updates to metadata alone
for any given version - given the version is valid and
present.
This helps reduce the chattiness for following calls..
- PutObjectTags
- DeleteObjectTags
- PutObjectLegalHold
- PutObjectRetention
- ReplicateObject (updates metadata on replication status)
- collect real time replication metrics for prometheus.
- add pending_count, failed_count metric for total pending/failed replication operations.
- add API to get replication metrics
- add MRF worker to handle spill-over replication operations
- multiple issues found with replication
- fixes an issue when client sends a bucket
name with `/` at the end from SetRemoteTarget
API call make sure to trim the bucket name to
avoid any extra `/`.
- hold write locks in GetObjectNInfo during replication
to ensure that object version stack is not overwritten
while reading the content.
- add additional protection during WriteMetadata() to
ensure that we always write a valid FileInfo{} and avoid
ever writing empty FileInfo{} to the lowest layers.
Co-authored-by: Poorna Krishnamoorthy <poorna@minio.io>
Co-authored-by: Harshavardhana <harsha@minio.io>
current master breaks this important requirement
we need to preserve legacyXLv1 format, this is simply
ignored and overwritten causing a myriad of issues
by leaving stale files on the namespace etc.
for now lets still use the two-phase approach of
writing to `tmp` and then renaming the content to
the actual namespace.
versionID is the one that needs to be preserved and as
well as overwritten in case of replication, transition
etc - dataDir is an ephemeral entity that changes
during overwrites - make sure that versionID is used
to save the object content.
this would break things if you are already running
the latest master, please wipe your current content
and re-do your setup after this change.
upgrading from 2yr old releases is expected to work,
the issue was we were missing checksum info to be
passed down to newBitrotReader() for whole bitrot
calculation
Ensure that we don't use potentially broken algorithms for critical functions, whether it be a runtime problem or implementation problem for a specific platform.
It is inefficient to decide to heal an object before checking its
lifecycle for expiration or transition. This commit will just reverse
the order of action: evaluate lifecycle and heal only if asked and
lifecycle resulted a NoneAction.
replication didn't work as expected when deletion of
delete markers was requested in DeleteMultipleObjects
API, this is due to incorrect lookup elements being
used to look for delete markers.
This allows us to speed up or slow down sleeps
between multiple scanner cycles, helps in testing
as well as some deployments might want to run
scanner more frequently.
This change is also dynamic can be applied on
a running cluster, subsequent cycles pickup
the newly set value.
using Lstat() is causing tiny memory allocations,
that are usually wasted and never used, instead
we can simply uses Access() call that does 0
memory allocations.
This feature brings in support for auto extraction
of objects onto MinIO's namespace from an incoming
tar gzipped stream, the only expected metadata sent
by the client is to set `snowball-auto-extract`.
All the contents from the tar stream are saved as
folders and objects on the namespace.
fixes#8715
service accounts were not inheriting parent policies
anymore due to refactors in the PolicyDBGet() from
the latest release, fix this behavior properly.
The local node name is heavily used in tracing, create a new global
variable to store it. Multiple goroutines can access it since it won't be
changed later.
In #11888 we observe a lot of running, WalkDir calls.
There doesn't appear to be any listerners for these calls, so they should be aborted.
Ensure that WalkDir aborts when upstream cancels the request.
Fixes#11888
The background healing can return NoSuchUpload error, the reason is that
healing code can return errFileNotFound with three parameters. Simplify
the code by returning exact errUploadNotFound error in multipart code.
Also ensure that a typed error is always returned whatever the number of
parameters because it is better than showing internal error.
For large objects taking more than '3 minutes' response
times in a single PUT operation can timeout prematurely
as 'ResponseHeader' timeout hits for 3 minutes. Avoid
this by keeping the connection active during CreateFile
phase.
baseDirFromPrefix(prefix) for object names without
parent directory incorrectly uses empty path, leading
to long listing at various paths that are not useful
for healing - avoid this listing completely if "baseDir"
returns empty simple use the "prefix" as is.
this improves startup performance significantly
For large objects taking more than '3 minutes' response
times in a single PUT operation can timeout prematurely
as 'ResponseHeader' timeout hits for 3 minutes. Avoid
this by keeping the connection active during CreateFile
phase.
some SDKs might incorrectly send duplicate
entries for keys such as "conditions", Go
stdlib unmarshal for JSON does not support
duplicate keys - instead skips the first
duplicate and only preserves the last entry.
This can lead to issues where a policy JSON
while being valid might not properly apply
the required conditions, allowing situations
where POST policy JSON would end up allowing
uploads to unauthorized buckets and paths.
This PR fixes this properly.
This commit adds a `MarshalText` implementation
to the `crypto.Context` type.
The `MarshalText` implementation replaces the
`WriteTo` and `AppendTo` implementation.
It is slightly slower than the `AppendTo` implementation
```
goos: darwin
goarch: arm64
pkg: github.com/minio/minio/cmd/crypto
BenchmarkContext_AppendTo/0-elems-8 381475698 2.892 ns/op 0 B/op 0 allocs/op
BenchmarkContext_AppendTo/1-elems-8 17945088 67.54 ns/op 0 B/op 0 allocs/op
BenchmarkContext_AppendTo/3-elems-8 5431770 221.2 ns/op 72 B/op 2 allocs/op
BenchmarkContext_AppendTo/4-elems-8 3430684 346.7 ns/op 88 B/op 2 allocs/op
```
vs.
```
BenchmarkContext/0-elems-8 135819834 8.658 ns/op 2 B/op 1 allocs/op
BenchmarkContext/1-elems-8 13326243 89.20 ns/op 128 B/op 1 allocs/op
BenchmarkContext/3-elems-8 4935301 243.1 ns/op 200 B/op 3 allocs/op
BenchmarkContext/4-elems-8 2792142 428.2 ns/op 504 B/op 4 allocs/op
goos: darwin
```
However, the `AppendTo` benchmark used a pre-allocated buffer. While
this improves its performance it does not match the actual usage of
`crypto.Context` which is passed to a `KMS` and always encoded into
a newly allocated buffer.
Therefore, this change seems acceptable since it should not impact the
actual performance but reduces the overall code for Context marshaling.
When an object is removed, its parent directory is inspected to check if
it is empty to remove if that is the case.
However, we can use os.Remove() directly since it is only able to remove
a file or an empty directory.
RenameData renames xl.meta and data dir and removes the parent directory
if empty, however, there is a duplicate check for empty dir, since the
parent dir of xl.meta is always the same as the data-dir.
on freshReads if drive returns errInvalidArgument, we
should simply turn-off DirectIO and read normally, there
are situations in k8s like environments where the drives
behave sporadically in a single deployment and may not
have been implemented properly to handle O_DIRECT for
reads.
This PR adds deadlines per Write() calls, such
that slow drives are timed-out appropriately and
the overall responsiveness for Writes() is always
up to a predefined threshold providing applications
sustained latency even if one of the drives is slow
to respond.
MRF was starting to heal when it receives a disk connection event, which
is not good when a node having multiple disks reconnects to the cluster.
Besides, MRF needs Remove healing option to remove stale files.
- write in o_dsync instead of o_direct for smaller
objects to avoid unaligned double Write() situations
that may arise for smaller objects < 128KiB
- avoid fallocate() as its not useful since we do not
use Append() semantics anymore, fallocate is not useful
for streaming I/O we can save on a syscall
- createFile() doesn't need to validate `bucket` name
with a Lstat() call since createFile() is only used
to write at `minioTmpBucket`
- use io.Copy() when writing unAligned writes to allow
usage of ReadFrom() from *os.File providing zero
buffer writes().
```
mc admin info --json
```
provides these details, for now, we shall eventually
expose this at Prometheus level eventually.
Co-authored-by: Harshavardhana <harsha@minio.io>
This commit fixes a security issue in the signature v4 chunked
reader. Before, the reader returned unverified data to the caller
and would only verify the chunk signature once it has encountered
the end of the chunk payload.
Now, the chunk reader reads the entire chunk into an in-memory buffer,
verifies the signature and then returns data to the caller.
In general, this is a common security problem. We verifying data
streams, the verifier MUST NOT return data to the upper layers / its
callers as long as it has not verified the current data chunk / data
segment:
```
func (r *Reader) Read(buffer []byte) {
if err := r.readNext(r.internalBuffer); err != nil {
return err
}
if err := r.verify(r.internalBuffer); err != nil {
return err
}
copy(buffer, r.internalBuffer)
}
```
For operations that require the object to exist make it possible to
detect if the file isn't found in *any* pool.
This will allow these to return the error early without having to re-check.
Cases where we have applications making request
for `//` in object names make sure that all
are normalized to `/` and all such requests that
are prefixed '/' are removed. To ensure a
consistent view from all operations.
Some deployments have low parity (EC:2), but we really do not need to
save our config data with the same parity configuration.
N/2 would be better to keep MinIO configurations intact when unexpected
a number of drives fail.
This commit disables the Hashicorp Vault
support but provides a way to temp. enable
it via the `MINIO_KMS_VAULT_DEPRECATION=off`
Vault support has been deprecated long ago
and this commit just requires users to take
action if they maintain a Vault integration.
major performance improvements in range GETs to avoid large
read amplification when ranges are tiny and random
```
-------------------
Operation: GET
Operations: 142014 -> 339421
Duration: 4m50s -> 4m56s
* Average: +139.41% (+1177.3 MiB/s) throughput, +139.11% (+658.4) obj/s
* Fastest: +125.24% (+1207.4 MiB/s) throughput, +132.32% (+612.9) obj/s
* 50% Median: +139.06% (+1175.7 MiB/s) throughput, +133.46% (+660.9) obj/s
* Slowest: +203.40% (+1267.9 MiB/s) throughput, +198.59% (+753.5) obj/s
```
TTFB from 10MiB BlockSize
```
* First Access TTFB: Avg: 81ms, Median: 61ms, Best: 20ms, Worst: 2.056s
```
TTFB from 1MiB BlockSize
```
* First Access TTFB: Avg: 22ms, Median: 21ms, Best: 8ms, Worst: 91ms
```
Full object reads however do see a slight change which won't be
noticeable in real world, so not doing any comparisons
TTFB still had improvements with full object reads with 1MiB
```
* First Access TTFB: Avg: 68ms, Median: 35ms, Best: 11ms, Worst: 1.16s
```
v/s
TTFB with 10MiB
```
* First Access TTFB: Avg: 388ms, Median: 98ms, Best: 20ms, Worst: 4.156s
```
This change should affect all new uploads, previous uploads should
continue to work with business as usual. But dramatic improvements can
be seen with these changes.
A group can have multiple policies, a user subscribed to readwrite &
diagnostics can perform S3 operations & admin operations as well.
However, the current code only returns one policy for one group.
This commit disables SHA-3 for OpenID when building a
FIPS-140 2 compatible binary. While SHA-3 is a
crypto. hash function accepted by NIST there is no
FIPS-140 2 compliant implementation available when
using the boringcrypto Go branch.
Therefore, SHA-3 must not be used when building
a FIPS-140 2 binary.
* Provide information on *actively* healing, buckets healed/queued, objects healed/failed.
* Add concurrent healing of multiple sets (typically on startup).
* Add bucket level resume, so restarts will only heal non-healed buckets.
* Print summary after healing a disk is done.
currently when one of the peer is down, the
drives from that peer are reported as '0/0'
offline instead we should capture/filter the
drives from the peer and populate it appropriately
such that `mc admin info` displays correct info.
This commit adds the `FromContentMD5` function to
parse a client-provided content-md5 as ETag.
Further, it also adds multipart ETag computation
for future needs.
prometheus metrics was using total disks instead
of online disk count, when disks were down, this
PR fixes this and also adds a new metric for
total_disk_count
Creating notification events for replica creation
is not particularly useful to send as the notification
event generated at source already includes replication
completion events.
For applications using replica cluster as failover, avoiding
duplicate notifications for replica event will allow seamless
failover.
also re-use storage disks for all `mc admin server info`
calls as well, implement a new LocalStorageInfo() API
call at ObjectLayer to lookup local disks storageInfo
also fixes bugs where there were double calls to StorageInfo()
While starting up a request that needs all IAM data will start another load operation if the first on startup hasn't finished. This slows down both operations.
Block these requests until initial load has completed.
Blocking calls will be ListPolicies, ListUsers, ListServiceAccounts, ListGroups - and the calls that eventually trigger these. These will wait for the initial load to complete.
Fixes issue seen in #11305
Implicit permissions for any user is to be allowed to
change their own password, we need to restrict this
further even if there is an implicit allow for this
scenario - we have to honor Deny statements if they
are specified.
ListObjectVersions would skip past the object in the marker when version id is specified.
Make `listPath` return the object with the marker and truncate it if not needed.
Avoid having to parse unintended objects to find a version marker.
The previous code was iterating over replies from peers and assigning
pool numbers to them, thus missing to add it for the local server.
Fixed by iterating over the server properties of all the servers
including the local one.
There was an io.LimitReader was missing for the 'length'
parameter for ranged requests, that would cause client to
get truncated responses and errors.
fixes#11651
The base profiles contains no valuable data, don't record them.
Reduce block rate by 2 orders of magnitude, should still capture just as valuable data with less CPU strain.
most of the delete calls today spend time in
a blocking operation where multiple calls need
to be recursively sent to delete the objects,
instead we can use rename operation to atomically
move the objects from the namespace to `tmp/.trash`
we can schedule deletion of objects at this
location once in 15, 30mins and we can also add
wait times between each delete operation.
this allows us to make delete's faster as well
less chattier on the drives, each server runs locally
a groutine which would clean this up regularly.
This commit removes the `GetObject` method
from the `ObjectLayer` interface.
The `GetObject` method is not longer used by
the HTTP handlers implementing the high-level
S3 semantics. Instead, they use the `GetObjectNInfo`
method which returns both, an object handle as well
as the object metadata.
Therefore, it is no longer necessary that a concrete
`ObjectLayer` implements `GetObject`.
store the cache in-memory instead of disks to avoid large
write amplifications for list heavy workloads, store in
memory instead and let it auto expire.
This commit replaces the usage of
github.com/minio/sha256-simd with crypto/sha256
of the standard library in all non-performance
critical paths.
This is necessary for FIPS 140-2 compliance which
requires that all crypto. primitives are implemented
by a FIPS-validated module.
Go can use the Google FIPS module. The boringcrypto
branch of the Go standard library uses the BoringSSL
FIPS module to implement crypto. primitives like AES
or SHA256.
We only keep github.com/minio/sha256-simd when computing
the content-SHA256 of an object. Therefore, this commit
relies on a build tag `fips`.
When MinIO is compiled without the `fips` flag it will
use github.com/minio/sha256-simd. When MinIO is compiled
with the fips flag (go build --tags "fips") then MinIO
uses crypto/sha256 to compute the content-SHA256.
Instead of using O_SYNC, we are better off using O_DSYNC
instead since we are only ever interested in data to be
persisted to disk not the associated filesystem metadata.
For reads we ask customers to turn off noatime, but instead
we can proactively use O_NOATIME flag to avoid atime updates
upon reads.
This removes the Content-MD5 response header on Range requests in Azure
Gateway mode. The partial content MD5 doesn't match the full object MD5
in metadata.
This commit adds a new package `etag` for dealing
with S3 ETags.
Even though ETag is often viewed as MD5 checksum of
an object, handling S3 ETags correctly is a surprisingly
complex task. While it is true that the ETag corresponds
to the MD5 for the most basic S3 API operations, there are
many exceptions in case of multipart uploads or encryption.
In worse, some S3 clients expect very specific behavior when
it comes to ETags. For example, some clients expect that the
ETag is a double-quoted string and fail otherwise.
Non-AWS compliant ETag handling has been a source of many bugs
in the past.
Therefore, this commit adds a dedicated `etag` package that provides
functionality for parsing, generating and converting S3 ETags.
Further, this commit removes the ETag computation from the `hash`
package. Instead, the `hash` package (i.e. `hash.Reader`) should
focus only on computing and verifying the content-sha256.
One core feature of this commit is to provide a mechanism to
communicate a computed ETag from a low-level `io.Reader` to
a high-level `io.Reader`.
This problem occurs when an S3 server receives a request and
has to compute the ETag of the content. However, the server
may also wrap the initial body with several other `io.Reader`,
e.g. when encrypting or compressing the content:
```
reader := Encrypt(Compress(ETag(content)))
```
In such a case, the ETag should be accessible by the high-level
`io.Reader`.
The `etag` provides a mechanism to wrap `io.Reader` implementations
such that the `ETag` can be accessed by a type-check.
This technique is applied to the PUT, COPY and Upload handlers.
server startup code expects the object layer to properly
convert error into a proper type, so that in situations when
servers are coming up and quorum is not available servers
wait on each other.
using isServerResolvable for expiration can lead to chicken
and egg problems, a lock might expire knowingly when server
is booting up causing perpetual locks getting expired.
- In username search filter and username format variables we support %s for
replacing with the username.
- In group search filter we support %s for username and %d for the full DN of
the username.
Harshavardhana
Krishnan Parthasarathi
Klaus Post
Anis Elleuch
Andreas Auernhammer
Poorna Krishnamoorthy
ebozduman
sgandon
iternity-dotcom
Ritesh H Shukla
Steven Reitsma
Aditya Manthramurthy
Ritesh H Shukla
Steve Wills
Nitish Tiwari
Philip Brown
Max Xu
Shireesh Anjal
Bala FA
cbows
Petr Tichý