PersistentIOEngine (Apache HBase 1.4.11 API)

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Summary:
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Method

Detail:
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All Superinterfaces:

IOEngine

All Known Implementing Classes:

FileIOEngine
```
@InterfaceAudience.Private
public interface PersistentIOEngine
extends IOEngine
```
A class implementing PersistentIOEngine interface supports persistent and file integrity verify for BucketCache

Method Summary

Methods
Modifier and Type	Method and Description
`byte[]`	`calculateChecksum(String algorithm)` Using an encryption algorithm to calculate a checksum, the default encryption algorithm is MD5
`boolean`	`verifyFileIntegrity(byte[] persistentChecksum, String algorithm)` Verify cache files's integrity

Methods inherited from interface org.apache.hadoop.hbase.io.hfile.bucket.IOEngine
isPersistent, read, shutdown, sync, write

- Method Detail
  - calculateChecksum
```
byte[] calculateChecksum(String algorithm)
```
    Using an encryption algorithm to calculate a checksum, the default encryption algorithm is MD5
    
    Parameters:
    algorithm - which algorithm to calculate checksum
    
    Returns:
    the checksum which is convert to HexString
  - verifyFileIntegrity
```
boolean verifyFileIntegrity(byte[] persistentChecksum,
                          String algorithm)
```
    Verify cache files's integrity
    
    Parameters:
    persistentChecksum - the persistent checksum
    algorithm - which algorithm to calculate checksum
    
    Returns:
    true if verify successfully

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