io.cdap.delta.store

Class HCFSStateStore

java.lang.Object

io.cdap.delta.store.HCFSStateStore

All Implemented Interfaces:

StateStore

public class HCFSStateStore
extends Object
implements StateStore

Stores replicator state based on hadoop filesystem . Is used only during migration

Method Summary

Modifier and Type	Method and Description
static HCFSStateStore	from(org.apache.hadoop.fs.Path basePath)
Long	getLatestGeneration(String namespace, String pipelineName)
Collection<Integer>	getWorkerInstances(DeltaPipelineId pipelineId)
OffsetAndSequence	readOffset(DeltaWorkerId id)
byte[]	readState(DeltaWorkerId id, String key)
void	writeOffset(DeltaWorkerId id, OffsetAndSequence offset)
void	writeState(DeltaWorkerId id, String key, byte[] val)

Methods inherited from class java.lang.Object

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

Method Detail

from

public static HCFSStateStore from(org.apache.hadoop.fs.Path basePath)
                           throws IOException

Throws:

IOException

readOffset

@Nullable
public OffsetAndSequence readOffset(DeltaWorkerId id)
                                       throws IOException

Specified by:

readOffset in interface StateStore

Throws:

IOException

writeOffset

public void writeOffset(DeltaWorkerId id,
                        OffsetAndSequence offset)
                 throws IOException

Specified by:

writeOffset in interface StateStore

Throws:

IOException

getLatestGeneration

@Nullable
public Long getLatestGeneration(String namespace,
                                          String pipelineName)
                                   throws IOException

Specified by:

getLatestGeneration in interface StateStore

Returns:

the most recent generation of the given pipeline

Throws:

IOException

getWorkerInstances

public Collection<Integer> getWorkerInstances(DeltaPipelineId pipelineId)
                                       throws IOException

Specified by:

getWorkerInstances in interface StateStore

Throws:

IOException

readState

@Nullable
public byte[] readState(DeltaWorkerId id,
                                  String key)
                           throws IOException

Specified by:

readState in interface StateStore

Throws:

IOException

writeState

public void writeState(DeltaWorkerId id,
                       String key,
                       byte[] val)
                throws IOException

Specified by:

writeState in interface StateStore

Throws:

IOException