org.apache.hadoop.hbase.fs

Class ErasureCodingUtils

java.lang.Object

org.apache.hadoop.hbase.fs.ErasureCodingUtils

@InterfaceAudience.Private
public final class ErasureCodingUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static void	enablePolicy(org.apache.hadoop.fs.FileSystem fs, String policy)
static String	getPolicyNameForPath(org.apache.hadoop.hdfs.DistributedFileSystem dfs, org.apache.hadoop.fs.Path path)
static boolean	needsSync(TableDescriptor oldDescriptor, TableDescriptor newDescriptor) Check if EC policy is different between two descriptors
static void	setPolicy(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path path, String policy) Sets the EC policy on the path
static void	setPolicy(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path rootDir, TableName tableName, String policy) Sets the EC policy on the table directory for the specified table
static void	sync(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path rootDir, TableDescriptor newDescriptor) Sync the EC policy state from the newDescriptor onto the FS for the table dir of the provided table descriptor.
static void	unsetPolicy(org.apache.hadoop.fs.FileSystem fs, org.apache.hadoop.fs.Path rootDir, TableName tableName) Unsets any EC policy specified on the path.
static void	verifySupport(org.apache.hadoop.conf.Configuration conf, String policy) Runs checks against the FileSystem, verifying that HDFS is supported and the policy is available, enabled, and works with a simple write.

Methods inherited from class java.lang.Object

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

Method Detail

verifySupport

public static void verifySupport(org.apache.hadoop.conf.Configuration conf,
                                 String policy)
                          throws HBaseIOException

Runs checks against the FileSystem, verifying that HDFS is supported and the policy is available, enabled, and works with a simple write.

Throws:

HBaseIOException

needsSync

public static boolean needsSync(TableDescriptor oldDescriptor,
                                TableDescriptor newDescriptor)

Check if EC policy is different between two descriptors

Returns:

true if a sync is necessary

sync

public static void sync(org.apache.hadoop.fs.FileSystem fs,
                        org.apache.hadoop.fs.Path rootDir,
                        TableDescriptor newDescriptor)
                 throws IOException

Sync the EC policy state from the newDescriptor onto the FS for the table dir of the provided table descriptor. If the policy is null, we will remove erasure coding from the FS for the table dir. If it's non-null, we'll set it to that policy.

Parameters:

newDescriptor - descriptor containing the policy and table name

Throws:

IOException

setPolicy

public static void setPolicy(org.apache.hadoop.fs.FileSystem fs,
                             org.apache.hadoop.fs.Path rootDir,
                             TableName tableName,
                             String policy)
                      throws IOException

Sets the EC policy on the table directory for the specified table

Throws:

IOException

setPolicy

public static void setPolicy(org.apache.hadoop.fs.FileSystem fs,
                             org.apache.hadoop.fs.Path path,
                             String policy)
                      throws IOException

Sets the EC policy on the path

Throws:

IOException

unsetPolicy

public static void unsetPolicy(org.apache.hadoop.fs.FileSystem fs,
                               org.apache.hadoop.fs.Path rootDir,
                               TableName tableName)
                        throws IOException

Unsets any EC policy specified on the path.

Throws:

IOException

enablePolicy

public static void enablePolicy(org.apache.hadoop.fs.FileSystem fs,
                                String policy)
                         throws IOException

Throws:

IOException

getPolicyNameForPath

public static String getPolicyNameForPath(org.apache.hadoop.hdfs.DistributedFileSystem dfs,
                                          org.apache.hadoop.fs.Path path)
                                   throws IOException

Throws:

IOException