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org.apache.oozie
Class DagEngine

java.lang.Object
  org.apache.oozie.BaseEngine
      org.apache.oozie.DagEngine

public class DagEngine
extends BaseEngine

The DagEngine provides all the DAG engine functionality for WS calls.

Field Summary

Fields inherited from class org.apache.oozie.BaseEngine

authToken, USE_XCOMMAND, user

Constructor Summary

DagEngine()
Create a system Dag engine, with no user and no group.

DagEngine(String user, String authToken)
Create a Dag engine to perform operations on behave of a user.

Method Summary

void	change(String jobId, String changeValue) Change a coordinator job.
String	dryRunSubmit(org.apache.hadoop.conf.Configuration conf) Dry run a job; like {@link BaseEngine#submitJob(org.apache.hadoop.conf.Configuration, boolean) but doesn't actually execute the job.
org.apache.oozie.client.CoordinatorJob	getCoordJob(String jobId) Return the info about a coord job.
org.apache.oozie.client.CoordinatorJob	getCoordJob(String jobId, String filter, int start, int length) Return the info about a coord job with actions subset.
String	getDefinition(String jobId) Return the a job definition.
org.apache.oozie.client.WorkflowJob	getJob(String jobId) Return the info about a job.
org.apache.oozie.client.WorkflowJob	getJob(String jobId, int start, int length) Return the info about a job with actions subset.
String	getJobIdForExternalId(String externalId) Return the workflow Job ID for an external ID.
WorkflowsInfo	getJobs(String filter, int start, int len) Return the info about a set of jobs.
WorkflowActionBean	getWorkflowAction(String actionId)
void	kill(String jobId) Kill a job.
protected Map<String,List<String>>	parseFilter(String filter) Validate a jobs filter.
void	processCallback(String actionId, String externalStatus, Properties actionData) Process an action callback.
void	reRun(String jobId, org.apache.hadoop.conf.Configuration conf) Rerun a job.
void	resume(String jobId) Resume a job.
void	start(String jobId) Start a job.
void	streamLog(String jobId, Writer writer) Stream the log of a job.
String	submitHttpJob(org.apache.hadoop.conf.Configuration conf, String jobType) Submit a pig/mapreduce job through HTTP.
String	submitJob(org.apache.hadoop.conf.Configuration conf, boolean startJob) Submit a workflow job.
void	suspend(String jobId) Suspend a job.

Methods inherited from class org.apache.oozie.BaseEngine

getAuthToken, getUser

Methods inherited from class java.lang.Object

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

Constructor Detail

DagEngine

public DagEngine()

Create a system Dag engine, with no user and no group.

DagEngine

public DagEngine(String user,
                 String authToken)

Create a Dag engine to perform operations on behave of a user.

Parameters:

user - user name.

authToken - the authentication token.

Method Detail

submitJob

public String submitJob(org.apache.hadoop.conf.Configuration conf,
                        boolean startJob)
                 throws DagEngineException

Submit a workflow job.

It validates configuration properties.

Specified by:

submitJob in class BaseEngine

Parameters:

conf - job configuration.

startJob - indicates if the job should be started or not.

Returns:

the job Id.

Throws:

DagEngineException - thrown if the job could not be created.

submitHttpJob

public String submitHttpJob(org.apache.hadoop.conf.Configuration conf,
                            String jobType)
                     throws DagEngineException

Submit a pig/mapreduce job through HTTP.

It validates configuration properties.

Parameters:

conf - job configuration.

jobType - job type - can be "pig" or "mapreduce".

Returns:

the job Id.

Throws:

DagEngineException - thrown if the job could not be created.

start

public void start(String jobId)
           throws DagEngineException

Start a job.

Specified by:

start in class BaseEngine

Parameters:

jobId - job Id.

Throws:

DagEngineException - thrown if the job could not be started.

resume

public void resume(String jobId)
            throws DagEngineException

Resume a job.

Specified by:

resume in class BaseEngine

Parameters:

jobId - job Id.

Throws:

DagEngineException - thrown if the job could not be resumed.

suspend

public void suspend(String jobId)
             throws DagEngineException

Suspend a job.

Specified by:

suspend in class BaseEngine

Parameters:

jobId - job Id.

Throws:

DagEngineException - thrown if the job could not be suspended.

kill

public void kill(String jobId)
          throws DagEngineException

Kill a job.

Specified by:

kill in class BaseEngine

Parameters:

jobId - job Id.

Throws:

DagEngineException - thrown if the job could not be killed.

change

public void change(String jobId,
                   String changeValue)
            throws DagEngineException

Description copied from class: BaseEngine

Change a coordinator job.

Specified by:

change in class BaseEngine

Parameters:

jobId - job Id.

changeValue - change value.

Throws:

DagEngineException

reRun

public void reRun(String jobId,
                  org.apache.hadoop.conf.Configuration conf)
           throws DagEngineException

Rerun a job.

Specified by:

reRun in class BaseEngine

Parameters:

jobId - job Id to rerun.

conf - configuration information for the rerun.

Throws:

DagEngineException - thrown if the job could not be rerun.

processCallback

public void processCallback(String actionId,
                            String externalStatus,
                            Properties actionData)
                     throws DagEngineException

Process an action callback.

Parameters:

actionId - the action Id.

externalStatus - the action external status.

actionData - the action output data, null if none.

Throws:

DagEngineException - thrown if the callback could not be processed.

getJob

public org.apache.oozie.client.WorkflowJob getJob(String jobId)
                                           throws DagEngineException

Return the info about a job.

Specified by:

getJob in class BaseEngine

Parameters:

jobId - job Id.

Returns:

the workflow job info.

Throws:

DagEngineException - thrown if the job info could not be obtained.

getJob

public org.apache.oozie.client.WorkflowJob getJob(String jobId,
                                                  int start,
                                                  int length)
                                           throws DagEngineException

Return the info about a job with actions subset.

Specified by:

getJob in class BaseEngine

Parameters:

jobId - job Id

start - starting from this index in the list of actions belonging to the job

length - number of actions to be returned

Returns:

the workflow job info.

Throws:

DagEngineException - thrown if the job info could not be obtained.

getDefinition

public String getDefinition(String jobId)
                     throws DagEngineException

Return the a job definition.

Specified by:

getDefinition in class BaseEngine

Parameters:

jobId - job Id.

Returns:

the job definition.

Throws:

DagEngineException - thrown if the job definition could no be obtained.

streamLog

public void streamLog(String jobId,
                      Writer writer)
               throws IOException,
                      DagEngineException

Stream the log of a job.

Specified by:

streamLog in class BaseEngine

Parameters:

jobId - job Id.

writer - writer to stream the log to.

Throws:

IOException - thrown if the log cannot be streamed.

DagEngineException - thrown if there is error in getting the Workflow Information for jobId.

parseFilter

protected Map<String,List<String>> parseFilter(String filter)
                                        throws DagEngineException

Validate a jobs filter.

Parameters:

filter - filter to validate.

Returns:

the parsed filter.

Throws:

DagEngineException - thrown if the filter is invalid.

getJobs

public WorkflowsInfo getJobs(String filter,
                             int start,
                             int len)
                      throws DagEngineException

Return the info about a set of jobs.

Parameters:

filter - job filter. Refer to the OozieClient for the filter syntax.

start - offset, base 1.

len - number of jobs to return.

Returns:

job info for all matching jobs, the jobs don't contain node action information.

Throws:

DagEngineException - thrown if the jobs info could not be obtained.

getJobIdForExternalId

public String getJobIdForExternalId(String externalId)
                             throws DagEngineException

Return the workflow Job ID for an external ID.

This is reverse lookup for recovery purposes.

Specified by:

getJobIdForExternalId in class BaseEngine

Parameters:

externalId - external ID provided at job submission time.

Returns:

the associated workflow job ID if any, null if none.

Throws:

DagEngineException - thrown if the lookup could not be done.

getCoordJob

public org.apache.oozie.client.CoordinatorJob getCoordJob(String jobId)
                                                   throws BaseEngineException

Description copied from class: BaseEngine

Return the info about a coord job.

Specified by:

getCoordJob in class BaseEngine

Parameters:

jobId - job Id.

Returns:

the coord job info.

Throws:

BaseEngineException - thrown if the job info could not be obtained.

getCoordJob

public org.apache.oozie.client.CoordinatorJob getCoordJob(String jobId,
                                                          String filter,
                                                          int start,
                                                          int length)
                                                   throws BaseEngineException

Description copied from class: BaseEngine

Return the info about a coord job with actions subset.

Specified by:

getCoordJob in class BaseEngine

Parameters:

jobId - job Id.

filter - the status filter

start - starting from this index in the list of actions belonging to the job

length - number of actions to be returned

Returns:

the coord job info.

Throws:

BaseEngineException - thrown if the job info could not be obtained.

getWorkflowAction

public WorkflowActionBean getWorkflowAction(String actionId)
                                     throws BaseEngineException

Throws:

BaseEngineException

dryRunSubmit

public String dryRunSubmit(org.apache.hadoop.conf.Configuration conf)
                    throws BaseEngineException

Description copied from class: BaseEngine

Dry run a job; like {@link BaseEngine#submitJob(org.apache.hadoop.conf.Configuration, boolean) but doesn't actually execute the job.

It validates configuration properties.

Specified by:

dryRunSubmit in class BaseEngine

Parameters:

conf - job configuration.

Returns:

the result of the dryrun

Throws:

BaseEngineException - thrown if there was a problem doing the dryrun