org.apache.hadoop.hbase.io.hfile.bucket

Class PersistentIOEngine

java.lang.Object

org.apache.hadoop.hbase.io.hfile.bucket.PersistentIOEngine

All Implemented Interfaces:

IOEngine

Direct Known Subclasses:

FileIOEngine, FileMmapIOEngine

@InterfaceAudience.Private
public abstract class PersistentIOEngine
extends Object
implements IOEngine

A class implementing PersistentIOEngine interface supports file integrity verification for BucketCache which use persistent IOEngine

Field Summary

Fields

Modifier and Type	Field and Description
protected String[]	filePaths

Constructor Summary

Constructors

Constructor and Description
PersistentIOEngine(String... filePaths)

Method Summary

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.hadoop.hbase.io.hfile.bucket.IOEngine

isPersistent, read, shutdown, sync, usesSharedMemory, write, write

Field Detail

filePaths

protected final String[] filePaths

Constructor Detail

PersistentIOEngine

public PersistentIOEngine(String... filePaths)

Method Detail

verifyFileIntegrity

protected void verifyFileIntegrity(byte[] persistentChecksum,
                                   String algorithm)
                            throws IOException

Verify cache files's integrity

Parameters:

algorithm - the backingMap persistence path

Throws:

IOException

calculateChecksum

protected byte[] calculateChecksum(String algorithm)

Using an encryption algorithm to calculate a checksum, the default encryption algorithm is MD5

Returns:

the checksum which is convert to HexString

Throws:

IOException - something happened like file not exists

NoSuchAlgorithmException - no such algorithm