SSM v1.2.0

Highlights:

1. Asynchronous data sync between HDFS clusters. This is the first stage of SSM Cluster Disaster Recovery solution. Sync operations can be triggered in a few seconds after changes happened in the source cluster. Both file content (incremental sync) and metadata are synced.
2. Action scheduler and rule plugin mechanism support. Interfaces provided for user to control the processing of action and rule.
3. Web UI refined. Improves the interactive experience and provides more specific metrics for scenarios like data disaster recovery and movement of data with different temperatures.

Change log:

• #1155, Fix list cached files failure
• Fix a deadlock caused by meta
• #1126, Fix slow when loading helper web page
• Create support-new-action-guide.md
• #1119, Refine Mover progress report
• #1127，Refine 'Actions' and 'Cluster' web UI
• #1128, Data throttling for file move action
• #1109, Upgrade Kerby version to v1.0.1
• #1107, Fix random failure of TestActionRestApi
• #1105, Fix action progress data error issue
• #1095, Namespace not sync after restart SSM
• Add list file actions for mover and copy
• Remove duplicate actions
• Add mover page to list movers by rule
• List Move ans Sync rule restful api
• Add list actions by rid
• #1030 Disable smartnotebook broadcast paragraph
• Add listActionsByType Restful API support
• Add metastore support for listing actions by type
• #1022, Fix ActionInfo been modified unexpectedly issue
• #1015, Add interface to impact the execution of rules
• #920 Store datanodeinfo fetched into metastore
• #1011, Add action scheduler interface
• Avoid fetching the name space if possible when start SSM server