// PruneActionLogs prunes old actionlog entries. Returns how many
// entries were purged (even if there was an error).
//
// There is a chance some processes might still be waiting for action
// results, but it is very very small.
func (zkts *Server) PruneActionLogs(zkActionLogPath string, keepCount int) (prunedCount int, err error) {
if path.Base(zkActionLogPath) != "actionlog" {
return 0, fmt.Errorf("not actionlog path: %v", zkActionLogPath)
}
// get sorted list of children
children, _, err := zkts.zconn.Children(zkActionLogPath)
if err != nil {
return 0, err
}
sort.Strings(children)
// see if nothing to do
if len(children) <= keepCount {
return 0, nil
}
for i := 0; i < len(children)-keepCount; i++ {
actionPath := path.Join(zkActionLogPath, children[i])
err = zk.DeleteRecursive(zkts.zconn, actionPath, -1)
if err != nil {
return prunedCount, fmt.Errorf("purge action err: %v", err)
}
prunedCount++
}
return prunedCount, nil
}
// PurgeActions removes all queued actions, leaving the action node
// itself in place.
//
// This inherently breaks the locking mechanism of the action queue,
// so this is a rare cleanup action, not a normal part of the flow.
//
// This can be used for tablets, shards and keyspaces.
func (zkts *Server) PurgeActions(zkActionPath string, canBePurged func(data string) bool) error {
if path.Base(zkActionPath) != "action" {
return fmt.Errorf("not action path: %v", zkActionPath)
}
children, _, err := zkts.zconn.Children(zkActionPath)
if err != nil {
return err
}
sort.Strings(children)
// Purge newer items first so the action queues don't try to process something.
for i := len(children) - 1; i >= 0; i-- {
actionPath := path.Join(zkActionPath, children[i])
data, _, err := zkts.zconn.Get(actionPath)
if err != nil && !zookeeper.IsError(err, zookeeper.ZNONODE) {
return fmt.Errorf("PurgeActions(%v) err: %v", zkActionPath, err)
}
if !canBePurged(data) {
continue
}
err = zk.DeleteRecursive(zkts.zconn, actionPath, -1)
if err != nil && !zookeeper.IsError(err, zookeeper.ZNONODE) {
return fmt.Errorf("PurgeActions(%v) err: %v", zkActionPath, err)
}
}
return nil
}
func (zkts *Server) DeleteTablet(alias topo.TabletAlias) error {
// We need to find out the keyspace and shard names because those are required
// in the TabletChange event.
ti, tiErr := zkts.GetTablet(alias)
zkTabletPath := TabletPathForAlias(alias)
err := zk.DeleteRecursive(zkts.zconn, zkTabletPath, -1)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return err
}
// Only try to log if we have the required information.
if tiErr == nil {
// We only want to copy the identity info for the tablet (alias, etc.).
// The rest has just been deleted, so it should be blank.
event.Dispatch(&events.TabletChange{
Tablet: topo.Tablet{
Alias: ti.Tablet.Alias,
Keyspace: ti.Tablet.Keyspace,
Shard: ti.Tablet.Shard,
},
Status: "deleted",
})
}
return nil
}
func (zkts *Server) unlockForAction(lockPath, results string) error {
// Write the data to the actionlog
actionLogPath := strings.Replace(lockPath, "/action/", "/actionlog/", 1)
if _, err := zk.CreateRecursive(zkts.zconn, actionLogPath, results, 0, zookeeper.WorldACL(zookeeper.PERM_ALL)); err != nil {
log.Warningf("Cannot create actionlog path %v (check the permissions with 'zk stat'), will keep the lock, use 'zk rm' to clear the lock", actionLogPath)
return err
}
// and delete the action
return zk.DeleteRecursive(zkts.zconn, lockPath, -1)
}
func (zkts *Server) DeleteKeyspaceShards(keyspace string) error {
shardsPath := path.Join(globalKeyspacesPath, keyspace, "shards")
if err := zk.DeleteRecursive(zkts.zconn, shardsPath, -1); err != nil && !zookeeper.IsError(err, zookeeper.ZNONODE) {
return err
}
event.Dispatch(&events.KeyspaceChange{
KeyspaceInfo: *topo.NewKeyspaceInfo(keyspace, nil, -1),
Status: "deleted all shards",
})
return nil
}
func cmdRm(subFlags *flag.FlagSet, args []string) {
var (
force = subFlags.Bool("f", false, "no warning on nonexistent node")
recursiveDelete = subFlags.Bool("r", false, "recursive delete")
forceAndRecursive = subFlags.Bool("rf", false, "shorthand for -r -f")
)
subFlags.Parse(args)
*force = *force || *forceAndRecursive
*recursiveDelete = *recursiveDelete || *forceAndRecursive
if subFlags.NArg() == 0 {
log.Fatal("rm: no path specified")
}
if *recursiveDelete {
for _, arg := range subFlags.Args() {
zkPath := fixZkPath(arg)
if strings.Count(zkPath, "/") < 4 {
log.Fatalf("rm: overly general path: %v", zkPath)
}
}
}
resolved, err := zk.ResolveWildcards(zconn, subFlags.Args())
if err != nil {
log.Fatalf("rm: invalid wildcards: %v", err)
}
if len(resolved) == 0 {
// the wildcards didn't result in anything, we're done
return
}
hasError := false
for _, arg := range resolved {
zkPath := fixZkPath(arg)
var err error
if *recursiveDelete {
err = zk.DeleteRecursive(zconn, zkPath, -1)
} else {
err = zconn.Delete(zkPath, -1)
}
if err != nil && (!*force || !zookeeper.IsError(err, zookeeper.ZNONODE)) {
hasError = true
log.Warningf("rm: cannot delete %v: %v", zkPath, err)
}
}
if hasError {
// to be consistent with the command line 'rm -f', return
// 0 if using 'zk rm -f' and the file doesn't exist.
os.Exit(1)
}
}
func (zkts *Server) DeleteShard(keyspace, shard string) error {
shardPath := path.Join(globalKeyspacesPath, keyspace, "shards", shard)
err := zk.DeleteRecursive(zkts.zconn, shardPath, -1)
if err != nil {
if zookeeper.IsError(err, zookeeper.ZNONODE) {
err = topo.ErrNoNode
}
return err
}
event.Dispatch(&events.ShardChange{
ShardInfo: *topo.NewShardInfo(keyspace, shard, nil, -1),
Status: "deleted",
})
return nil
}