HFileBlockIndex (Apache HBase 1.4.11 API)

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java.lang.Object
- org.apache.hadoop.hbase.io.hfile.HFileBlockIndex

```
@InterfaceAudience.Private
public class HFileBlockIndex
extends Object
```
Provides functionality to write (HFileBlockIndex.BlockIndexWriter) and read BlockIndexReader single-level and multi-level block indexes. Examples of how to use the block index writer can be found in CompoundBloomFilterWriter and HFileWriterV2. Examples of how to use the reader can be found in HFileReaderV2 and TestHFileBlockIndex.

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`static class`	`HFileBlockIndex.BlockIndexReader` The reader will always hold the root level index in the memory.
`static class`	`HFileBlockIndex.BlockIndexWriter` Writes the block index into the output stream.

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`MAX_CHUNK_SIZE_KEY` The maximum size guideline for index blocks (both leaf, intermediate, and root).
`static String`	`MIN_INDEX_NUM_ENTRIES_KEY` Minimum number of entries in a single index block.

Constructor Summary

Constructors
Constructor and Description

HFileBlockIndex()

Method Summary

Methods
Modifier and Type	Method and Description
`static int`	`getMaxChunkSize(org.apache.hadoop.conf.Configuration conf)`
`static int`	`getMinIndexNumEntries(org.apache.hadoop.conf.Configuration conf)`

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

- Field Detail
  - MAX_CHUNK_SIZE_KEY
```
public static final String MAX_CHUNK_SIZE_KEY
```
    The maximum size guideline for index blocks (both leaf, intermediate, and root). If not specified, DEFAULT_MAX_CHUNK_SIZE is used.
    
    See Also:
    Constant Field Values
  - MIN_INDEX_NUM_ENTRIES_KEY
```
public static final String MIN_INDEX_NUM_ENTRIES_KEY
```
    Minimum number of entries in a single index block. Even if we are above the hfile.index.block.max.size we will keep writing to the same block unless we have that many entries. We should have at least a few entries so that we don't have too many levels in the multi-level index. This should be at least 2 to make sure there is no infinite recursion.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - HFileBlockIndex
```
public HFileBlockIndex()
```
- Method Detail
  - getMaxChunkSize
```
public static int getMaxChunkSize(org.apache.hadoop.conf.Configuration conf)
```
  - getMinIndexNumEntries
```
public static int getMinIndexNumEntries(org.apache.hadoop.conf.Configuration conf)
```

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