org.apache.orc.impl

Class HadoopShimsPre2_7

java.lang.Object

org.apache.orc.impl.HadoopShimsPre2_7

All Implemented Interfaces:

HadoopShims

public class HadoopShimsPre2_7
extends Object
implements HadoopShims

Shims for versions of Hadoop less than 2.7. Adds support for:

• Crypto

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.orc.impl.HadoopShims

HadoopShims.ByteBufferPoolShim, HadoopShims.DirectCompressionType, HadoopShims.DirectDecompressor, HadoopShims.KeyMetadata, HadoopShims.KeyProvider, HadoopShims.LocalKey, HadoopShims.ZeroCopyReaderShim

Constructor Summary

Constructors

Constructor and Description
HadoopShimsPre2_7()

Method Summary

Modifier and Type	Method and Description
boolean	endVariableLengthBlock(OutputStream output) End the OutputStream's current block at the current location.
HadoopShims.DirectDecompressor	getDirectDecompressor(HadoopShims.DirectCompressionType codec) Get a direct decompressor codec, if it is available
HadoopShims.KeyProvider	getKeyProvider(Configuration conf, Random random) Create a KeyProvider to get encryption keys.
HadoopShims.ZeroCopyReaderShim	getZeroCopyReader(FSDataInputStream in, HadoopShims.ByteBufferPoolShim pool) Provides an HDFS ZeroCopyReader shim.

Methods inherited from class java.lang.Object

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

Constructor Detail

HadoopShimsPre2_7

public HadoopShimsPre2_7()

Method Detail

getDirectDecompressor

public HadoopShims.DirectDecompressor getDirectDecompressor(HadoopShims.DirectCompressionType codec)

Description copied from interface: HadoopShims

Get a direct decompressor codec, if it is available

Specified by:

getDirectDecompressor in interface HadoopShims

Parameters:

codec - the kind of decompressor that we need

Returns:

a direct decompressor or null, if it isn't available

getZeroCopyReader

public HadoopShims.ZeroCopyReaderShim getZeroCopyReader(FSDataInputStream in,
                                                        HadoopShims.ByteBufferPoolShim pool)
                                                 throws IOException

Description copied from interface: HadoopShims

Provides an HDFS ZeroCopyReader shim.

Specified by:

getZeroCopyReader in interface HadoopShims

Parameters:

in - FSDataInputStream to read from (where the cached/mmap buffers are tied to)

pool - ByteBufferPoolShim to allocate fallback buffers with

Returns:

returns null if not supported

Throws:

IOException

endVariableLengthBlock

public boolean endVariableLengthBlock(OutputStream output)

Description copied from interface: HadoopShims

End the OutputStream's current block at the current location. This is only available on HDFS on Hadoop ≥ 2.7, but will return false otherwise.

Specified by:

endVariableLengthBlock in interface HadoopShims

Returns:

was a variable length block created?

getKeyProvider

public HadoopShims.KeyProvider getKeyProvider(Configuration conf,
                                              Random random)
                                       throws IOException

Description copied from interface: HadoopShims

Create a KeyProvider to get encryption keys.

Specified by:

getKeyProvider in interface HadoopShims

Parameters:

conf - the configuration

random - a secure random number generator

Returns:

a key provider or null if none was provided

Throws:

IOException