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a17f14f73a
epoll contention on TCP causes latency build-up when we have high volume ingress. This PR is an attempt to relieve this pressure. upstream issue https://github.com/golang/go/issues/65064 It seems to be a deeper problem; haven't yet tried the fix provide in this issue, but however this change without changing the compiler helps. Of course, this is a workaround for now, hoping for a more comprehensive fix from Go runtime.
112 lines
3.3 KiB
Go
112 lines
3.3 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"context"
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"errors"
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"github.com/minio/minio/internal/dsync"
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"github.com/minio/minio/internal/grid"
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)
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// lockRESTClient is authenticable lock REST client
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type lockRESTClient struct {
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connection *grid.Connection
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}
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// IsOnline - returns whether REST client failed to connect or not.
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func (c *lockRESTClient) IsOnline() bool {
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return c.connection.State() == grid.StateConnected
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}
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// Not a local locker
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func (c *lockRESTClient) IsLocal() bool {
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return false
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}
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// Close - marks the client as closed.
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func (c *lockRESTClient) Close() error {
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return nil
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}
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// String - returns the remote host of the connection.
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func (c *lockRESTClient) String() string {
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return c.connection.Remote
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}
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func (c *lockRESTClient) call(ctx context.Context, h *grid.SingleHandler[*dsync.LockArgs, *dsync.LockResp], args *dsync.LockArgs) (ok bool, err error) {
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r, err := h.Call(ctx, c.connection, args)
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if err != nil {
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return false, err
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}
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defer h.PutResponse(r)
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ok = r.Code == dsync.RespOK
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switch r.Code {
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case dsync.RespLockConflict, dsync.RespLockNotFound, dsync.RespOK:
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// no error
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case dsync.RespLockNotInitialized:
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err = errLockNotInitialized
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default:
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err = errors.New(r.Err)
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}
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return ok, err
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}
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// RLock calls read lock REST API.
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func (c *lockRESTClient) RLock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return c.call(ctx, lockRPCRLock, &args)
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}
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// Lock calls lock REST API.
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func (c *lockRESTClient) Lock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return c.call(ctx, lockRPCLock, &args)
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}
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// RUnlock calls read unlock REST API.
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func (c *lockRESTClient) RUnlock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return c.call(ctx, lockRPCRUnlock, &args)
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}
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// Refresh calls Refresh REST API.
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func (c *lockRESTClient) Refresh(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return c.call(ctx, lockRPCRefresh, &args)
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}
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// Unlock calls write unlock RPC.
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func (c *lockRESTClient) Unlock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return c.call(ctx, lockRPCUnlock, &args)
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}
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// ForceUnlock calls force unlock handler to forcibly unlock an active lock.
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func (c *lockRESTClient) ForceUnlock(ctx context.Context, args dsync.LockArgs) (reply bool, err error) {
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return c.call(ctx, lockRPCForceUnlock, &args)
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}
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func newLockAPI(endpoint Endpoint) dsync.NetLocker {
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if endpoint.IsLocal {
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return globalLockServer
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}
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return newlockRESTClient(endpoint)
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}
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// Returns a lock rest client.
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func newlockRESTClient(ep Endpoint) *lockRESTClient {
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return &lockRESTClient{globalLockGrid.Load().Connection(ep.GridHost())}
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}
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