rakeshadr commented on PR #10473:
URL: https://github.com/apache/ozone/pull/10473#issuecomment-4714913409
Adding sequence-diagram to understand high-level view of IP address change
issue and the recovery execution path implemented in this PR.
_Pre-Fix Flow (Sequence Diagram):-_
```
Ozone Component Core InetSocketAddress OS TCP Layer
Network Plane
| | |
|
|-- 1. Get Target Connection --->| |
|
|<- 2. Returns Frozen IP --------| |
|
| |
|
|-- 3. Dial Request (connect()) ------------------------->|
|
| |-- 4. Send
TCP SYN ------>|
| | (To
Old IP Location)|---> [DEAD ENDPOINT]
| |
| (Drops or Resets)
| |<-- 5. No
Response/RST ---|
|<-- 6. Connect Timeout / SocketException ----------------|
|
|-- 7. Retry Loop Initiated (Bypasses Name Resolution) ---> [Loops
back to Step 1, Dialing Dead IP]
```
_Post-Fix Recovery Flow (Sequence Diagram):-_
```
Component Engine ConnectionFailureUtils
SCMConnectionManager StateContext Target Peer
| | |
| |
|-- 1. Heartbeat/RPC Call
------------------------------------------------------------------------------>X
[Old IP - Fails]
|<- 2. Throws SocketTimeoutException / ConnectException
------------------------------------------------|
|
|-- 3. isConnectionFailure(ex)? -->|
|<-- 4. Returns TRUE --------------|
|
|-- 5. Force Refresh -------------------------------------->|
| |-- 6.
Re-resolve Host -->| (DNS Lookup)
| |<- 7.
Returns New IP ----|
| |
| |-- 8.
Swap Endpoint ---->| [Phase 1: PUBLISH]
| |
| (Creates New Queue)
| |
|
| |-- 9.
Update Registry -->| [Phase 2: SWITCH]
| |
| (Swaps Keys Under Lock)
| |
|
| |-- 10.
Purge Stale ----->| [Phase 3: RETIRE]
| |
(Cleans Old Address)
|
|-- 11. Next Attempt (Dials Reconstructed Proxy)
------------------------------------------------------------>| [New IP Location]
|<-- 12. 200 OK Connection Established (Handshake Renewed)
----------------------------------------------------|
```
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