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36 lines
2.1 KiB
Markdown
36 lines
2.1 KiB
Markdown
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- SessionManagerServer has a number of state flags:
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- SS_READY = 1; // Set by dmlProc one time when dmlProc is ready
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- SS_SUSPENDED = 2// Set by console when the system has been suspended by user.
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- SS_SUSPEND_PENDING = 4// Set by console when user wants to suspend, but writing is occuring.
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- SS_SHUTDOWN_PENDING = 8 // Set by console when user wants to shutdown, but writing is occuring.
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- SS_ROLLBACK = 16; // In combination with a PENDING flag, force a rollback as soon as possible.
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- SS_FORCE = 32; // In combination with a PENDING flag, force a shutdown without rollback.
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- SS_QUERY_READY = 64 // Set by PrimProc after ExeMgr thread is up and running
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- The actual state is a combination of flags.
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- The state of a running cluster resides in SessionManagerServer instance attribute that is inside a controllernode process.
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- There is a cold storage for a state that is stored in a file pointed by SessionManager.TxnIDFile with /var/lib/columnstore/data1/systemFiles/dbrm/SMTxnID. This cold state is loaded up when controllernode starts.
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- The following FSM diagram demostrates some transitions. !It is not full yet!
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```mermaid
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stateDiagram-v2
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ZeroState --> InitState : Controllernode reads cold state
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InitState --> InitState_6 : ExeMgr threads starts in PP/SS_QUERY_READY
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InitState_6 --> InitState_6_!1 : DMLProc begins rollbackAll / !SS_READY
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InitState_6_!1 --> InitState_6_!1 : DMLProc fails rollbackAll /
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InitState_6_!1 --> InitState_6_1 : DMLProc finishes rollbackAll sucessfully / SS_READY
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InitState_6_1 --> InitState_16_8_6_1 : cmapi_gets_shutdown
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InitState_16_8_6_1 --> ZeroState : see rollback_is_ok
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InitState_16_8_6_1 --> InitState_32_16_8_6_1 : see failed_rollback
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InitState_32_16_8_6_1 --> ZeroState : force DMLProc shutdown
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```
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cmapi_gets_shutdown: CMAPI gets shutdown request with TO / SS_SHUTDOWN_PENDING + SS_ROLLBACK
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rollback_is_ok: DMLProc sucessfully rollbacks active txns within TO and cluster stops
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failed_rollback: DMLProc sucessfully rollbacks active txns within TO and cluster stops
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