RocksDBSnapshotStrategyBase.PreviousSnapshot (Flink : State backends : RocksDB 2.1.2-cp1 API)

java.lang.Object
- org.apache.flink.state.rocksdb.snapshot.RocksDBSnapshotStrategyBase.PreviousSnapshot

Enclosing class:

RocksDBSnapshotStrategyBase<K,R extends org.apache.flink.runtime.state.SnapshotResources>
```
protected static class RocksDBSnapshotStrategyBase.PreviousSnapshot
extends Object
```
Previous snapshot with uploaded sst files.

Constructor Summary

Constructors
Modifier	Constructor	Description
`protected`	`PreviousSnapshot(SortedMap<Long,Collection<org.apache.flink.runtime.state.IncrementalKeyedStateHandle.HandleAndLocalPath>> currentUploadedSstFiles, long lastCompletedCheckpoint)`	Constructor of PreviousSnapshot.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected Optional<org.apache.flink.runtime.state.StreamStateHandle>`	`getUploaded(String filename)`
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - PreviousSnapshot
```
protected PreviousSnapshot(@Nullable
                           SortedMap<Long,Collection<org.apache.flink.runtime.state.IncrementalKeyedStateHandle.HandleAndLocalPath>> currentUploadedSstFiles,
                           long lastCompletedCheckpoint)
```
    Constructor of PreviousSnapshot. Giving a map of uploaded sst files in previous checkpoints, prune the sst files which have been re-uploaded in the following checkpoints. The prune logic is used to resolve the mismatch between TM and JM due to notification delay. Following steps for example:
    
    1) checkpoint 1 uses file 00001.SST uploaded as xxx.sst.
    2) checkpoint 2 uses the same file 00001.SST but re-uploads it as yyy.sst because CP 1 wasn't yet confirmed.
    3) TM get a confirmation of checkpoint 1.
    4) JM completes checkpoint 2 and subsumes checkpoint 1 - removing xxx.sst.
    5) checkpoint 3 tries to re-use file 00001.SST uploaded as xxx.sst in checkpoint 1, but it was deleted in (4) by JM.
    Parameters:
    
    currentUploadedSstFiles - the sst files uploaded in previous checkpoints.
    
    lastCompletedCheckpoint - the last completed checkpoint id.
- Method Detail
  - getUploaded
```
protected Optional<org.apache.flink.runtime.state.StreamStateHandle> getUploaded(String filename)
```
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object