basic code flow

[sumitagrawl]

What changes were proposed in this pull request?

1. UpgradePrepare have impact of termIndex and doubleBuffer

2. OMStateMachine need not have startTransaction, preAppend

3. Need remove double doubleBuffer

4. To work with WAL removal with using Raft Log as recovery, and impact to Recon

5. Some TODO for executor for cache removal, cache index generation, throtelling, db error,

6. cache removal for specific tables (earlier based on annotation of response class), this can be based on db tables getting updated

7. partial Table cache optimization for removal case

8. cache reversal on db update failure on distributed node ... ??

9. Audit log will be at Leader only

10. raft log track for request -- not present -- add caller operation and audit log for db sync ??

11. metrics update on follower node for operation -- now not present

12. performance optimization / verification

with this mechanism, lot of failure testcase needs remove / change.

What is the link to the Apache JIRA

NA

How was this patch tested?

• basic verify with create volume, bucket and file working