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retrieval: Handle serverset node not existing.

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This stops configuration loading hanging if
the Znode doesn't exist, and retries until the
node does exist.
This commit is contained in:
Brian Brazil 2015-07-01 13:53:39 +01:00
parent 049a106821
commit 3d268d681e
1 changed files with 11 additions and 3 deletions
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14
retrieval/discovery/serverset.go
View file

@ -223,6 +223,7 @@ func NewZookeeperTreeCache(conn *zk.Conn, path string, events chan zookeeperTree
tc.head = &zookeeperTreeCacheNode{
events: make(chan zk.Event),
children: map[string]*zookeeperTreeCacheNode{},
stopped: true,
}
err := tc.recursiveNodeUpdate(path, tc.head)
if err != nil {
@ -279,16 +280,20 @@ func (tc *zookeeperTreeCache) loop(failureMode bool) {
if err != nil {
log.Errorf("Error during processing of Zookeeper event: %s", err)
failure()
} else if tc.head.data == nil {
log.Errorf("Error during processing of Zookeeper event: path %s no longer exists", tc.prefix)
failure()
}
}
case <-retryChan:
log.Infof("Attempting to resync state with Zookeeper")
err := tc.recursiveNodeUpdate(tc.prefix, tc.head)
if err == nil {
failureMode = false
} else {
if err != nil {
log.Errorf("Error during Zookeeper resync: %s", err)
failure()
} else {
log.Infof("Zookeeper resync successful")
failureMode = false
}
case <-tc.stop:
close(tc.events)
@ -301,6 +306,9 @@ func (tc *zookeeperTreeCache) recursiveNodeUpdate(path string, node *zookeeperTr
data, _, dataWatcher, err := tc.conn.GetW(path)
if err == zk.ErrNoNode {
tc.recursiveDelete(path, node)
if node == tc.head {
return fmt.Errorf("path %s does not exist", path)
}
return nil
} else if err != nil {
return err