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XL: ListDir should return each List from a random disk in the set. (#1613)

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Fixes #1609
This commit is contained in:
Harshavardhana 2016-05-13 18:12:26 -07:00 committed by Anand Babu (AB) Periasamy
parent 8099396ff0
commit 0e4e9c4bc1
1 changed files with 23 additions and 14 deletions
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37
xl-erasure-v1.go
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@ -18,6 +18,7 @@ package main
import (
"fmt"
"math/rand"
"os"
slashpath "path"
"strings"
@ -479,24 +480,32 @@ func (xl XL) ListDir(volume, dirPath string) (entries []string, err error) {
if !isValidVolname(volume) {
return nil, errInvalidArgument
}
// FIXME: need someway to figure out which disk has the latest namespace
// so that Listing can be done there. One option is always do Listing from
// the "local" disk - if it is down user has to list using another XL server.
// This way user knows from which disk he is listing from.
for _, disk := range xl.storageDisks {
if entries, err = disk.ListDir(volume, dirPath); err != nil {
continue
}
for i, entry := range entries {
if strings.HasSuffix(entry, slashSeparator) && isLeafDirectoryXL(disk, volume, path.Join(dirPath, entry)) {
entries[i] = strings.TrimSuffix(entry, slashSeparator)
// Count for list errors encountered.
var listErrCount = 0
// Loop through and return the first success entry based on the
// selected random disk.
for listErrCount < len(xl.storageDisks) {
// Choose a random disk on each attempt, do not hit the same disk all the time.
randIndex := rand.Intn(len(xl.storageDisks) - 1)
disk := xl.storageDisks[randIndex] // Pick a random disk.
// Initiate a list operation, if successful filter and return quickly.
if entries, err = disk.ListDir(volume, dirPath); err == nil {
for i, entry := range entries {
isLeaf := isLeafDirectoryXL(disk, volume, path.Join(dirPath, entry))
isDir := strings.HasSuffix(entry, slashSeparator)
if isDir && isLeaf {
entries[i] = strings.TrimSuffix(entry, slashSeparator)
}
}
// We got the entries successfully return.
return entries, nil
}
// We have list from one of the disks hence break the loop.
break
listErrCount++ // Update list error count.
}
return
// Return error at the end.
return nil, err
}
// Object API.