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ListObjects Metadata Caching (#10648)

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Design: https://gist.github.com/klauspost/025c09b48ed4a1293c917cecfabdf21c

Gist of improvements:

* Cross-server caching and listing will use the same data across servers and requests.
* Lists can be arbitrarily resumed at a constant speed.
* Metadata for all files scanned is stored for streaming retrieval.
* The existing bloom filters controlled by the crawler is used for validating caches.
* Concurrent requests for the same data (or parts of it) will not spawn additional walkers.
* Listing a subdirectory of an existing recursive cache will use the cache.
* All listing operations are fully streamable so the number of objects in a bucket no 
  longer dictates the amount of memory.
* Listings can be handled by any server within the cluster.
* Caches are cleaned up when out of date or superseded by a more recent one.
This commit is contained in:
Klaus Post
2020-10-28 09:18:35 -07:00
committed by GitHub
parent 51222cc664
commit a982baff27
65 changed files with 6328 additions and 742 deletions
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4
cmd/admin-handlers.go
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@@ -1035,7 +1035,7 @@ func (a adminAPIHandlers) TraceHandler(w http.ResponseWriter, r *http.Request) {
// Use buffered channel to take care of burst sends or slow w.Write()
traceCh := make(chan interface{}, 4000)
peers := newPeerRestClients(globalEndpoints)
peers, _ := newPeerRestClients(globalEndpoints)
globalHTTPTrace.Subscribe(traceCh, ctx.Done(), func(entry interface{}) bool {
return mustTrace(entry, trcAll, trcErr)
@@ -1103,7 +1103,7 @@ func (a adminAPIHandlers) ConsoleLogHandler(w http.ResponseWriter, r *http.Reque
logCh := make(chan interface{}, 4000)
peers := newPeerRestClients(globalEndpoints)
peers, _ := newPeerRestClients(globalEndpoints)
globalConsoleSys.Subscribe(logCh, ctx.Done(), node, limitLines, logKind, nil)