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Document node state machine #36
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This provides a description of how the operator and GD2 synchronize on the current state of Gluster nodes. Signed-off-by: John Strunk <[email protected]>
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@atinmu @aravindavk Does this proposal look reasonable? |
prashanthpai
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Aug 7, 2018
| The above state machine would apply independently to each node of the Gluster | ||
| cluster (i.e., each node has its own *current state*). The high-level meaning | ||
| of each state is: | ||
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Is this state maintained by operator ? Or do you expect glusterd2 to maintain this ?
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Per the suggestion farther down in this doc, the idea is to have a set of bool flags that would be maintained by GD2 per-node. Those flags are visible to both operator and GD2, and (depending on the specific flag) be modified by one or both of operator or gd2. See below for flag list and who is allowed to modify.
shtripat
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Nov 16, 2018
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| Note: | ||
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| - All 16 combinations are represented in the table, above |
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There are 4 binary flags (condition column) which leads to 2^4 = 16 combinations. These 16 combinations are then mapped into the 5 "states" that the document discusses.
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Describe what this PR does
This provides a description of the node state machine that allows the operator and GD2 synchronize on the current state of Gluster nodes.
Is there anything that requires special attention?
nope.
Related issues:
Fixes #17