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May 12, 2022 16:38
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| * <pre> | |
| * 1. The first step is to filter out region1, region2, and region3 from the routing table. | |
| * | |
| * ┌─────────────────┐ ┌─────────────────┐ | |
| * │ scan startKey │ │ scan endKey │ | |
| * └────────┬────────┘ └────────┬────────┘ | |
| * │ │ | |
| * │ │ | |
| * │ │ | |
| * ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ │ ┌ ─ ─ ─ ─ ─ ─ ┐ ┌ ─ ─ ─ ─ ─ ─ ┐ │ ┌ ─ ─ ─ ─ ─ ─ ┐ | |
| * startKey1=byte[0] │ │ startKey2 startKey3 │ startKey4 | |
| * └ ─ ─ ─ ┬ ─ ─ ─ ─ ─ │ └ ─ ─ ─│─ ─ ─ ┘ └ ─ ─ ─│─ ─ ─ ┘ │ └ ─ ─ ─│─ ─ ─ ┘ | |
| * │ │ │ │ │ │ | |
| * ▼───────────────▼─────────▼─────────────────────────▼─────────────▼───────────▼─────────────────────────┐ | |
| * │ │ │ │ │ | |
| * │ │ │ │ │ | |
| * │ region1 │ region2 │ region3 │ region4 │ | |
| * │ │ │ │ │ | |
| * └─────────────────────────┴─────────────────────────┴─────────────────────────┴─────────────────────────┘ | |
| * | |
| * 2. The second step is to split the request(scan -> multi-region scan): | |
| * region1->regionScan(startKey, regionEndKey1) | |
| * region2->regionScan(regionStartKey2, regionEndKey2) | |
| * region3->regionScan(regionStartKey3, endKey) | |
| * | |
| * ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ | |
| * call region1 │ call region2 │ call region3 │ | |
| * └ ─ ─ ─ ─ ─ ─ ─ ─ ─ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ | |
| * ║ ║ ║ | |
| * | |
| * ║ ║ ║ | |
| * ▽ ▽ ▽ | |
| * ┌─────────────────────────┬─────────────────────────┬─────────────────────────┬─────────────────────────┐ | |
| * │ │ │ │ │ | |
| * │ │ │ │ │ | |
| * │ region1 │ region2 │ region3 │ region4 │ | |
| * │ │ │ │ │ | |
| * └─────────────────────────┴─────────────────────────┴─────────────────────────┴─────────────────────────┘ | |
| * | |
| * 3. The third step, encountering the region split (the sign of the split is the change of the region epoch) | |
| * To refresh the RegionRouteTable, you need to obtain the latest routing table from the PD. | |
| * | |
| * For example, region2 is split into region2 + region5: | |
| * The request 'region2->regionScan(regionStartKey2, regionEndKey2)' split and retry | |
| * 1. region2->regionScan(regionStartKey2, newRegionEndKey2) | |
| * 2. region5->regionScan(regionStartKey5, regionEndKey5) | |
| * | |
| * ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ | |
| * call region1 │ call region3 │ | |
| * └ ─ ─ ─ ─ ─ ─ ─ ─ ─ └ ─ ─ ─ ─ ─ ─ ─ ─ ─ | |
| * ║ ┌ ─ ─ ─ ─ ─ ─ ┐ ║ | |
| * retry region2 | |
| * ║ └ ─ ─ ─ ─ ─ ─ ┘┌ ─ ─ ─ ─ ─ ─ ┐ ║ | |
| * ║ retry region5 | |
| * ║ └ ─ ─ ─ ─ ─ ─ ┘ ║ | |
| * ║ ║ | |
| * ║ ║ | |
| * ▽ ▽ ▽ ▽ | |
| * ┌─────────────────────────┬────────────┬ ─ ─ ─ ─ ─ ─┌─────────────────────────┬─────────────────────────┐ | |
| * │ │ │ │ │ │ | |
| * │ │ │ │ │ │ | |
| * │ region1 │ region2 │ region5 │ region3 │ region4 │ | |
| * │ │ │ │ │ │ | |
| * └─────────────────────────┴────────────┘─ ─ ─ ─ ─ ─ ┴─────────────────────────┴─────────────────────────┘ | |
| * | |
| * 4. Encountering 'Invalid-Peer'(NOT_LEADER, NO_REGION_FOUND, LEADER_NOT_AVAILABLE) | |
| * This is very simple, re-acquire the latest leader of the raft-group to which the current key belongs, | |
| * and then call again. | |
| * </pre> |
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