Update StreamingTaskMap
Update checkpoing api
Update checkpointing api
Merge branch 'master' of https://github.com/youtube/vitess
Add VTDATAROOT setting and creation to dev.env.
Merge branch 'master' of github.com:youtube/vitess
Fix scatter query with first ShardConn result being empty
Merge branch 'master' of https://github.com/youtube/vitess
Adding comments to the code.
Merge branch 'replication'