CompactionReason

java.lang.Object
- java.lang.Enum<CompactionReason>
- - org.rocksdb.CompactionReason

所有已实现的接口:

java.io.Serializable, java.lang.Comparable<CompactionReason>
```
public enum CompactionReason
extends java.lang.Enum<CompactionReason>
```

枚举常量概要

枚举常量
枚举常量和说明
`kBottommostFiles` [Level] Automatic compaction within bottommost level to cleanup duplicate versions of same user key, usually due to a released snapshot.
`kChangeTemperature` Compaction in order to move files to temperature
`kExternalSstIngestion` Compaction caused by external sst file ingestion
`kFIFOMaxSize` [FIFO] total size > max_table_files_size
`kFIFOReduceNumFiles` [FIFO] reduce number of files.
`kFIFOTtl` [FIFO] files with creation time < (current_time - interval)
`kFilesMarkedForCompaction` DB::SuggestCompactRange() marked files for compaction
`kFlush` According to the comments in flush_job.cc, RocksDB treats flush as a level 0 compaction in internal stats.
`kForcedBlobGC` Compaction scheduled to force garbage collection of blob files
`kLevelL0FilesNum` [Level] number of L0 files > level0_file_num_compaction_trigger
`kLevelMaxLevelSize` [Level] total size of level > MaxBytesForLevel()
`kManualCompaction` Manual compaction
`kPeriodicCompaction` Compaction due to SST file being too old
`kRefitLevel` Compaction by calling DBImpl::ReFitLevel
`kRoundRobinTtl` A special TTL compaction for RoundRobin policy, which basically the same as kLevelMaxLevelSize, but the goal is to compact TTLed files.
`kTtl` Compaction based on TTL
`kUniversalSizeAmplification` [Universal] Compacting for size amplification
`kUniversalSizeRatio` [Universal] Compacting for size ratio
`kUniversalSortedRunNum` [Universal] number of sorted runs > level0_file_num_compaction_trigger
`kUnknown`

方法概要

所有方法静态方法具体方法
限定符和类型	方法和说明
`static CompactionReason`	`valueOf(java.lang.String name)` 返回带有指定名称的该类型的枚举常量。
`static CompactionReason[]`	`values()` 按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。

从类继承的方法 java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- 枚举常量详细资料
  - kUnknown
```
public static final CompactionReason kUnknown
```
  - kLevelL0FilesNum
```
public static final CompactionReason kLevelL0FilesNum
```
    [Level] number of L0 files > level0_file_num_compaction_trigger
  - kLevelMaxLevelSize
```
public static final CompactionReason kLevelMaxLevelSize
```
    [Level] total size of level > MaxBytesForLevel()
  - kUniversalSizeAmplification
```
public static final CompactionReason kUniversalSizeAmplification
```
    [Universal] Compacting for size amplification
  - kUniversalSizeRatio
```
public static final CompactionReason kUniversalSizeRatio
```
    [Universal] Compacting for size ratio
  - kUniversalSortedRunNum
```
public static final CompactionReason kUniversalSortedRunNum
```
    [Universal] number of sorted runs > level0_file_num_compaction_trigger
  - kFIFOMaxSize
```
public static final CompactionReason kFIFOMaxSize
```
    [FIFO] total size > max_table_files_size
  - kFIFOReduceNumFiles
```
public static final CompactionReason kFIFOReduceNumFiles
```
    [FIFO] reduce number of files.
  - kFIFOTtl
```
public static final CompactionReason kFIFOTtl
```
    [FIFO] files with creation time < (current_time - interval)
  - kManualCompaction
```
public static final CompactionReason kManualCompaction
```
    Manual compaction
  - kFilesMarkedForCompaction
```
public static final CompactionReason kFilesMarkedForCompaction
```
    DB::SuggestCompactRange() marked files for compaction
  - kBottommostFiles
```
public static final CompactionReason kBottommostFiles
```
    [Level] Automatic compaction within bottommost level to cleanup duplicate versions of same user key, usually due to a released snapshot.
  - kTtl
```
public static final CompactionReason kTtl
```
    Compaction based on TTL
  - kFlush
```
public static final CompactionReason kFlush
```
    According to the comments in flush_job.cc, RocksDB treats flush as a level 0 compaction in internal stats.
  - kExternalSstIngestion
```
public static final CompactionReason kExternalSstIngestion
```
    Compaction caused by external sst file ingestion
  - kPeriodicCompaction
```
public static final CompactionReason kPeriodicCompaction
```
    Compaction due to SST file being too old
  - kChangeTemperature
```
public static final CompactionReason kChangeTemperature
```
    Compaction in order to move files to temperature
  - kForcedBlobGC
```
public static final CompactionReason kForcedBlobGC
```
    Compaction scheduled to force garbage collection of blob files
  - kRoundRobinTtl
```
public static final CompactionReason kRoundRobinTtl
```
    A special TTL compaction for RoundRobin policy, which basically the same as kLevelMaxLevelSize, but the goal is to compact TTLed files.
  - kRefitLevel
```
public static final CompactionReason kRefitLevel
```
    Compaction by calling DBImpl::ReFitLevel
- 方法详细资料
  - values
```
public static CompactionReason[] values()
```
    按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示:
```
for (CompactionReason c : CompactionReason.values())
    System.out.println(c);
```
    返回:
    
    按照声明该枚举类型的常量的顺序返回的包含这些常量的数组
  - valueOf
```
public static CompactionReason valueOf(java.lang.String name)
```
    返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
    
    参数:
    
    name - 要返回的枚举常量的名称。
    
    返回:
    
    返回带有指定名称的枚举常量
    
    抛出:
    
    java.lang.IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量
    
    java.lang.NullPointerException - 如果参数为空值

枚举 CompactionReason

枚举常量概要

方法概要

从类继承的方法 java.lang.Enum

从类继承的方法 java.lang.Object

枚举常量详细资料

kUnknown

kLevelL0FilesNum

kLevelMaxLevelSize

kUniversalSizeAmplification

kUniversalSizeRatio

kUniversalSortedRunNum

kFIFOMaxSize

kFIFOReduceNumFiles

kFIFOTtl

kManualCompaction

kFilesMarkedForCompaction

kBottommostFiles

kTtl

kFlush

kExternalSstIngestion

kPeriodicCompaction

kChangeTemperature

kForcedBlobGC

kRoundRobinTtl

kRefitLevel

方法详细资料

values

valueOf