/**
* For JsonMetadata stats are considered optional This method suppresses (and logs) errors if they
* are encountered.
*
* @see org.apache.pig.LoadMetadata#getStatistics(String, Job)
*/
@Override
public ResourceStatistics getStatistics(String location, Job job) throws IOException {
Configuration conf = job.getConfiguration();
Set<ElementDescriptor> statFileSet = null;
try {
statFileSet = findMetaFile(location, statFileName, conf);
} catch (IOException e) {
log.warn("could not fine stat file for " + location);
return null;
}
ElementDescriptor statFile = null;
if (!statFileSet.isEmpty()) {
statFile = statFileSet.iterator().next();
} else {
log.warn("Could not find stat file for " + location);
return null;
}
log.debug("Found stat file " + statFile.toString());
ResourceStatistics resourceStats = null;
try {
resourceStats = new ObjectMapper().readValue(statFile.open(), ResourceStatistics.class);
} catch (JsonParseException e) {
log.warn("Unable to load Resource Statistics for " + location);
e.printStackTrace();
} catch (JsonMappingException e) {
log.warn("Unable to load Resource Statistics for " + location);
e.printStackTrace();
} catch (IOException e) {
log.warn("Unable to load Resource Statistics for " + location);
e.printStackTrace();
}
return resourceStats;
}
/**
* Read the schema from json metadata file If isSchemaOn parameter is false, the errors are
* suppressed and logged
*
* @param location
* @param job
* @param isSchemaOn
* @return schema
* @throws IOException
*/
public ResourceSchema getSchema(String location, Job job, boolean isSchemaOn) throws IOException {
Configuration conf = job.getConfiguration();
Set<ElementDescriptor> schemaFileSet = null;
try {
schemaFileSet = findMetaFile(location, schemaFileName, conf);
} catch (IOException e) {
String msg = "Could not find schema file for " + location;
return nullOrException(isSchemaOn, msg, e);
}
// TODO we assume that all schemas are the same. The question of merging schemas is left open
// for now.
ElementDescriptor schemaFile = null;
if (!schemaFileSet.isEmpty()) {
schemaFile = schemaFileSet.iterator().next();
} else {
String msg = "Could not find schema file for " + location;
return nullOrException(isSchemaOn, msg, null);
}
log.debug("Found schema file: " + schemaFile.toString());
ResourceSchema resourceSchema = null;
try {
resourceSchema = new ObjectMapper().readValue(schemaFile.open(), ResourceSchema.class);
} catch (JsonParseException e) {
String msg = "Unable to load Resource Schema for " + location;
return nullOrException(isSchemaOn, msg, e);
} catch (JsonMappingException e) {
String msg = "Unable to load Resource Schema for " + location;
return nullOrException(isSchemaOn, msg, e);
} catch (IOException e) {
String msg = "Unable to load Resource Schema for " + location;
return nullOrException(isSchemaOn, msg, e);
}
return resourceSchema;
}