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增加RocksDBHeapTimersFullRestoreOperation

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LingZhaoHui 2023-09-24 23:19:22 +08:00
parent 486c9a3966
commit 38c9d59211
Signed by: zeekling
GPG Key ID: D96E4E75267CA2CC
1 changed files with 55 additions and 5 deletions
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basic/checkpoint.md
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@ -256,8 +256,8 @@ restoreWithoutRescaling(theFirstStateHandle);
- 选择最优的KeyedStateHandle。
- 初始化RocksDB实例。
- 根据已经选择的Handle从Base RocksDB实例中恢复数据。
- 裁剪Base RocksDB实例。
- 根据已经选择的Handle从Base RocksDB实例中恢复数据。
- 裁剪Base RocksDB实例。
- 将key-groups从临时RocksDB转换到Base RocksDB数据库。
@ -266,20 +266,70 @@ restoreWithoutRescaling(theFirstStateHandle);
- IncrementalRemoteKeyedStateHandle:
- IncrementalLocalKeyedStateHandle:
### RocksDBFullRestoreOperation
从完整的快照中恢复RocksDB实例的过程。
- 打开RocksDB数据库实例。
- 读取数据。
#### FullSnapshotRestoreOperation
下面是RocksDB后端采用的存储格式，主要是下面格式：
```
+-------------------------------------------------------------+
| Keyed Backend Meta Information |
Meta Information +--------------------+-----+----------------------------------+
| State Meta 0 | ... | State Meta M |
+-------------------------------------------------------------+
| State ID (short) |
State 0 +--------------------+-----+----------------------------------+
| State (K,V) pair 0 | ... | State (K,V) pair X (flipped MSB) |
+--------------------+-----+----------------------------------+
| State ID (short) |
State 1 +--------------------+-----+----------------------------------+
| State (K,V) pair 0 | ... | State (K,V) pair X (flipped MSB) |
+--------------------+-----+----------------------------------+
| State ID (short) |
+--------------------+-----+----------------------------------+
State M | State (K,V) pair 0 | ... | State (K,V) pair X (flipped MSB) |
+--------------------+-----+----------------------------------+
| END_OF_KEY_GROUP_MARK (0xFFFF) |
+-------------------------------------------------------------+
```
对于(K, V)格式与其他格式不同,格式如下：
```
+------------------+-------------------------------------+
| ValueState | [CompositeKey(KG, K, NS), SV] |
|------------------+-------------------------------------+
| ListState | [CompositeKey(KG, K, NS), SV] |
+------------------+-------------------------------------+
| MapState | [CompositeKey(KG, K, NS) :: UK, UV] |
+------------------+-------------------------------------+
| AggregatingState | [CompositeKey(KG, K, NS), SV] |
+------------------+-------------------------------------+
| ReducingState | [CompositeKey(KG, K, NS), SV] |
| +-------------------------------------+
| | [CompositeKey(KG, K, NS), SV] |
+------------------+-------------------------------------+
| Timers | [KG :: TS :: K :: NS, (empty)] |
+------------------+-------------------------------------+
```
### RocksDBHeapTimersFullRestoreOperation
从完整的快照中恢复RocksDB实例的过程。
### RocksDBNoneRestoreOperation
## ChangelogStateBackend