This PR adds a WebSocket grid feature that allows servers to communicate via
a single two-way connection.
There are two request types:
* Single requests, which are `[]byte => ([]byte, error)`. This is for efficient small
roundtrips with small payloads.
* Streaming requests which are `[]byte, chan []byte => chan []byte (and error)`,
which allows for different combinations of full two-way streams with an initial payload.
Only a single stream is created between two machines - and there is, as such, no
server/client relation since both sides can initiate and handle requests. Which server
initiates the request is decided deterministically on the server names.
Requests are made through a mux client and server, which handles message
passing, congestion, cancelation, timeouts, etc.
If a connection is lost, all requests are canceled, and the calling server will try
to reconnect. Registered handlers can operate directly on byte
slices or use a higher-level generics abstraction.
There is no versioning of handlers/clients, and incompatible changes should
be handled by adding new handlers.
The request path can be changed to a new one for any protocol changes.
First, all servers create a "Manager." The manager must know its address
as well as all remote addresses. This will manage all connections.
To get a connection to any remote, ask the manager to provide it given
the remote address using.
```
func (m *Manager) Connection(host string) *Connection
```
All serverside handlers must also be registered on the manager. This will
make sure that all incoming requests are served. The number of in-flight
requests and responses must also be given for streaming requests.
The "Connection" returned manages the mux-clients. Requests issued
to the connection will be sent to the remote.
* `func (c *Connection) Request(ctx context.Context, h HandlerID, req []byte) ([]byte, error)`
performs a single request and returns the result. Any deadline provided on the request is
forwarded to the server, and canceling the context will make the function return at once.
* `func (c *Connection) NewStream(ctx context.Context, h HandlerID, payload []byte) (st *Stream, err error)`
will initiate a remote call and send the initial payload.
```Go
// A Stream is a two-way stream.
// All responses *must* be read by the caller.
// If the call is canceled through the context,
//The appropriate error will be returned.
type Stream struct {
// Responses from the remote server.
// Channel will be closed after an error or when the remote closes.
// All responses *must* be read by the caller until either an error is returned or the channel is closed.
// Canceling the context will cause the context cancellation error to be returned.
Responses <-chan Response
// Requests sent to the server.
// If the handler is defined with 0 incoming capacity this will be nil.
// Channel *must* be closed to signal the end of the stream.
// If the request context is canceled, the stream will no longer process requests.
Requests chan<- []byte
}
type Response struct {
Msg []byte
Err error
}
```
There are generic versions of the server/client handlers that allow the use of type
safe implementations for data types that support msgpack marshal/unmarshal.
Currently, once the audit becomes offline, there is no code that tries
to reconnect to the audit, at the same time Send() quickly returns with
an error without really trying to send a message the audit endpoint; so
the audit endpoint will never be online again.
Fixing this behavior; the current downside is that we miss printing some
logs when the audit becomes offline; however this information is
available in prometheus
Later, we can refactor internal/logger so the http endpoint can send errors to
console target.
sendfile implementation to perform DMA on all platforms
Go stdlib already supports sendfile/splice implementations
for
- Linux
- Windows
- *BSD
- Solaris
Along with this change however O_DIRECT for reads() must be
removed as well since we need to use sendfile() implementation
The main reason to add O_DIRECT for reads was to reduce the
chances of page-cache causing OOMs for MinIO, however it would
seem that avoiding buffer copies from user-space to kernel space
this issue is not a problem anymore.
There is no Go based memory allocation required, and neither
the page-cache is referenced back to MinIO. This page-
cache reference is fully owned by kernel at this point, this
essentially should solve the problem of page-cache build up.
With this now we also support SG - when NIC supports Scatter/Gather
https://en.wikipedia.org/wiki/Gather/scatter_(vector_addressing)
replace io.Discard usage to fix NUMA copy() latencies
On NUMA systems copying from 8K buffer allocated via
io.Discard leads to large latency build-up for every
```
copy(new8kbuf, largebuf)
```
can in-cur upto 1ms worth of latencies on NUMA systems
due to memory sharding across NUMA nodes.
`GetParityForSC` has a value receiver, so Config is copied before the lock is obtained.
Make it pointer receiver.
Fixes:
```
WARNING: DATA RACE
Read at 0x0000079cdd10 by goroutine 190:
github.com/minio/minio/cmd.(*erasureServerPools).BackendInfo()
github.com/minio/minio/cmd/erasure-server-pool.go:579 +0x6f
github.com/minio/minio/cmd.(*erasureServerPools).LocalStorageInfo()
github.com/minio/minio/cmd/erasure-server-pool.go:614 +0x3c6
github.com/minio/minio/cmd.(*peerRESTServer).LocalStorageInfoHandler()
github.com/minio/minio/cmd/peer-rest-server.go:347 +0x4ea
github.com/minio/minio/cmd.(*peerRESTServer).LocalStorageInfoHandler-fm()
...
WARNING: DATA RACE
Read at 0x0000079cdd10 by goroutine 190:
github.com/minio/minio/cmd.(*erasureServerPools).BackendInfo()
github.com/minio/minio/cmd/erasure-server-pool.go:579 +0x6f
github.com/minio/minio/cmd.(*erasureServerPools).LocalStorageInfo()
github.com/minio/minio/cmd/erasure-server-pool.go:614 +0x3c6
github.com/minio/minio/cmd.(*peerRESTServer).LocalStorageInfoHandler()
github.com/minio/minio/cmd/peer-rest-server.go:347 +0x4ea
github.com/minio/minio/cmd.(*peerRESTServer).LocalStorageInfoHandler-fm()
```
If target went offline while MinIO was down, error once
while trying to send message. If target goes offline during
MinIO server running, it already comes through ping() call
and errors out if target offline.
Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>
all retries must not be counted as failed messages,
a failed message is a single counter not for all
retries, this PR fixes this.
Also we do not need to retry 10-times, instead we should
retry at max 3 times with some jitter to deliver the
messages.
- we already have MRF for most recent failures
- we trigger healing during HEAD/GET operation
These are enough, also change the default max wait
from 5sec to 1sec for default scanner speed.
configs from 2020 server throws an
error due to deprecation of the keys
however an attempt is made to parse
them, we should have chosen existing
defaults - this PR fixes that.
Fix drive rotational calculation status
If a MinIO drive path is mounted to a partition and not a real disk,
getting the rotational status would fail because Linux does not expose
that status to partition; In other words,
/sys/block/drive-partition-name/queue/rotational does not exist;
To fix the issue, the code will search for the rotational status of the
disk that hosts the partition, and this can be calculated from the
real path of /sys/class/block/<drive-partition-name>
Keys are helpful to ensure the strict ordering of messages, however currently the
code uses a random request id for every log, hence using the request-id
as a Kafka key is not serve any purpose;
This commit removes the usage of the key, to also fix the audit issue from
internal subsystem that does not have a request ID.
This commit updates the minio/kes-go dependency
to v0.2.0 and updates the existing code to work
with the new KES APIs.
The `SetPolicy` handler got removed since it
may not get implemented by KES at all and could
not have been used in the past since stateless KES
is read-only w.r.t. policies and identities.
Signed-off-by: Andreas Auernhammer <hi@aead.dev>
Two fields in lifecycles made GOB encoding consistently fail with `gob: type lifecycle.Prefix has no exported fields`.
This meant that in distributed systems listings would never be able to continue and would restart on every call.
Fix issues and be sure to log these errors at least once per bucket. We may see some connectivity errors here, but we shouldn't hide them.
