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java.lang.Objectorg.apache.hadoop.hbase.io.Reference
@InterfaceAudience.Private public class Reference
A reference to the top or bottom half of a store file where 'bottom' is the first half of the file containing the keys that sort lowest and 'top' is the second half of the file with keys that sort greater than those of the bottom half. The file referenced lives under a different region. References are made at region split time.
References work with a special half store file type. References know how to write out the reference format in the file system and are what is juggled when references are mixed in with direct store files. The half store file type is used reading the referred to file.
References to store files located over in some other region look like
this in the file system
1278437856009925445.3323223323
:
i.e. an id followed by hash of the referenced region.
Note, a region is itself not splittable if it has instances of store file
references. References are cleaned up by compactions.
Constructor Summary | |
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Reference()
Deprecated. |
Method Summary | |
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FSProtos.Reference |
convert()
|
static Reference |
convert(FSProtos.Reference r)
|
static Reference |
createBottomReference(byte[] splitRow)
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static Reference |
createTopReference(byte[] splitRow)
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org.apache.hadoop.hbase.io.Reference.Range |
getFileRegion()
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byte[] |
getSplitKey()
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static boolean |
isTopFileRegion(org.apache.hadoop.hbase.io.Reference.Range r)
|
static Reference |
read(org.apache.hadoop.fs.FileSystem fs,
org.apache.hadoop.fs.Path p)
Read a Reference from FileSystem. |
void |
readFields(DataInput in)
Deprecated. Writables are going away. Use the pb serialization methods instead. Remove in a release after 0.96 goes out. This is here only to migrate old Reference files written with Writables before 0.96. |
String |
toString()
|
org.apache.hadoop.fs.Path |
write(org.apache.hadoop.fs.FileSystem fs,
org.apache.hadoop.fs.Path p)
|
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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@Deprecated public Reference()
Method Detail |
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public static Reference createTopReference(byte[] splitRow)
splitRow
-
Reference
that points at top half of a an hfilepublic static Reference createBottomReference(byte[] splitRow)
splitRow
-
Reference
that points at the bottom half of a an hfilepublic org.apache.hadoop.hbase.io.Reference.Range getFileRegion()
public byte[] getSplitKey()
public String toString()
toString
in class Object
Object.toString()
public static boolean isTopFileRegion(org.apache.hadoop.hbase.io.Reference.Range r)
@Deprecated public void readFields(DataInput in) throws IOException
IOException
public org.apache.hadoop.fs.Path write(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path p) throws IOException
IOException
public static Reference read(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path p) throws IOException
fs
- p
-
p
IOException
public FSProtos.Reference convert()
public static Reference convert(FSProtos.Reference r)
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