Package org.apache.pig.backend.datastorage

Examples of org.apache.pig.backend.datastorage.ElementDescriptor

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        throws IOException {
        DataStorage storage = new HDataStorage(ConfigurationUtil.toProperties(conf));
        String fullPath = FileLocalizer.fullPath(path, storage);
        Set<ElementDescriptor> metaFileSet = new HashSet<ElementDescriptor>();
        if(storage.isContainer(fullPath)) {
            ElementDescriptor metaFilePath = storage.asElement(fullPath, prefix);
            if (metaFilePath.exists()) {
                metaFileSet.add(metaFilePath);
            }
        } else {
            ElementDescriptor[] descriptors = storage.asCollection(path);
            for(ElementDescriptor descriptor : descriptors) {
                String fileName = null, parentName = null;
                ContainerDescriptor parentContainer = null;
                if (descriptor instanceof HFile) {
                    Path descriptorPath = ((HFile) descriptor).getPath();
                    fileName = descriptorPath.getName();
                    Path parent = descriptorPath.getParent();
                    parentName = parent.toString();
                    parentContainer = new HDirectory((HDataStorage)storage,parent);
                }
                ElementDescriptor metaFilePath = storage.asElement(parentName, prefix+"."+fileName);

                // if the file has a custom schema, use it
                if (metaFilePath.exists()) {
                    metaFileSet.add(metaFilePath);
                    continue;
                }

                // if no custom schema, try the parent directory
                metaFilePath = storage.asElement(parentContainer, prefix);
                if (metaFilePath.exists()) {
                    metaFileSet.add(metaFilePath);
                }
            }
        }
        return metaFileSet;
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            log.warn("Could not find schema file for "+ location);
            return null;
        }
             
        // 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 {
            log.warn("Could not find schema file for "+location);
            return null;
        }
        log.debug("Found schema file: "+schemaFile.toString());
        ResourceSchema resourceSchema = null;
        try {
            resourceSchema = new ObjectMapper().readValue(schemaFile.open(), ResourceSchema.class);
        } catch (JsonParseException e) {
            log.warn("Unable to load Resource Schema for "+location);
            e.printStackTrace();
        } catch (JsonMappingException e) {
            log.warn("Unable to load Resource Schema for "+location);
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            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);
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    @Override
    public void storeStatistics(ResourceStatistics stats, String location, Job job) throws IOException {
        Configuration conf = job.getConfiguration();
        DataStorage storage = new HDataStorage(ConfigurationUtil.toProperties(conf));
        ElementDescriptor statFilePath = storage.asElement(location, statFileName);
        if(!statFilePath.exists() && stats != null) {
            try {
                new ObjectMapper().writeValue(statFilePath.create(), stats);                   
            } catch (JsonGenerationException e) {
                log.warn("Unable to write Resource Statistics for "+location);
                e.printStackTrace();
            } catch (JsonMappingException e) {
                log.warn("Unable to write Resource Statistics for "+location);
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    @Override
    public void storeSchema(ResourceSchema schema, String location, Job job) throws IOException {
        Configuration conf = job.getConfiguration();
        DataStorage storage = new HDataStorage(ConfigurationUtil.toProperties(conf));
        ElementDescriptor schemaFilePath = storage.asElement(location, schemaFileName);
        if(!schemaFilePath.exists() && schema != null) {
            try {
                new ObjectMapper().writeValue(schemaFilePath.create(), schema);
            } catch (JsonGenerationException e) {
                log.warn("Unable to write Resource Statistics for "+location);
                e.printStackTrace();
            } catch (JsonMappingException e) {
                log.warn("Unable to write Resource Statistics for "+location);
                e.printStackTrace();
            }
        }
        if (printHeaders) {
            ElementDescriptor headerFilePath = storage.asElement(location, headerFileName);
            if (!headerFilePath.exists()) {
                OutputStream os = headerFilePath.create();
                try {
                    String[] names = schema.fieldNames();

                    for (int i=0; i < names.length; i++) {
                        os.write(names[i].getBytes("UTF-8"));
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        throws IOException {
        DataStorage storage = new HDataStorage(ConfigurationUtil.toProperties(conf));
        String fullPath = FileLocalizer.fullPath(path, storage);
        Set<ElementDescriptor> metaFileSet = new HashSet<ElementDescriptor>();
        if(storage.isContainer(fullPath)) {
            ElementDescriptor metaFilePath = storage.asElement(fullPath, prefix);
            if (metaFilePath.exists()) {
                metaFileSet.add(metaFilePath);
            }
        } else {
            ElementDescriptor[] descriptors = storage.asCollection(path);
            for(ElementDescriptor descriptor : descriptors) {
                String fileName = null, parentName = null;
                ContainerDescriptor parentContainer = null;
                if (descriptor instanceof HFile) {
                    Path descriptorPath = ((HFile) descriptor).getPath();
                    fileName = descriptorPath.getName();
                    Path parent = descriptorPath.getParent();
                    parentName = parent.toString();
                    parentContainer = new HDirectory((HDataStorage)storage,parent);
                }
                ElementDescriptor metaFilePath = storage.asElement(parentName, prefix+"."+fileName);

                // if the file has a custom schema, use it
                if (metaFilePath.exists()) {
                    metaFileSet.add(metaFilePath);
                    continue;
                }

                // if no custom schema, try the parent directory
                metaFilePath = storage.asElement(parentContainer, prefix);
                if (metaFilePath.exists()) {
                    metaFileSet.add(metaFilePath);
                }
            }
        }
        return metaFileSet;
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            log.warn("Could not find schema file for "+ location);
            return null;
        }
             
        // 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 {
            log.warn("Could not find schema file for "+location);
            return null;
        }
        log.info("Found schema file: "+schemaFile.toString());
        ResourceSchema resourceSchema = null;
        try {
            resourceSchema = new ObjectMapper().readValue(schemaFile.open(), ResourceSchema.class);
        } catch (JsonParseException e) {
            log.warn("Unable to load Resource Schema for "+location);
            e.printStackTrace();
        } catch (JsonMappingException e) {
            log.warn("Unable to load Resource Schema for "+location);
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            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.info("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);
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    @Override
    public void storeStatistics(ResourceStatistics stats, String location, Job job) throws IOException {
        Configuration conf = job.getConfiguration();
        DataStorage storage = new HDataStorage(ConfigurationUtil.toProperties(conf));
        ElementDescriptor statFilePath = storage.asElement(location, statFileName);
        if(!statFilePath.exists() && stats != null) {
            try {
                new ObjectMapper().writeValue(statFilePath.create(), stats);                   
            } catch (JsonGenerationException e) {
                log.warn("Unable to write Resource Statistics for "+location);
                e.printStackTrace();
            } catch (JsonMappingException e) {
                log.warn("Unable to write Resource Statistics for "+location);
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    @Override
    public void storeSchema(ResourceSchema schema, String location, Job job) throws IOException {
        Configuration conf = job.getConfiguration();
        DataStorage storage = new HDataStorage(ConfigurationUtil.toProperties(conf));
        ElementDescriptor schemaFilePath = storage.asElement(location, schemaFileName);
        if(!schemaFilePath.exists() && schema != null) {
            try {
                new ObjectMapper().writeValue(schemaFilePath.create(), schema);
            } catch (JsonGenerationException e) {
                log.warn("Unable to write Resource Statistics for "+location);
                e.printStackTrace();
            } catch (JsonMappingException e) {
                log.warn("Unable to write Resource Statistics for "+location);
                e.printStackTrace();
            }
        }
        if (printHeaders) {
            ElementDescriptor headerFilePath = storage.asElement(location, headerFileName);
            if (!headerFilePath.exists()) {
                OutputStream os = headerFilePath.create();
                try {
                    String[] names = schema.fieldNames();

                    for (int i=0; i < names.length; i++) {
                        os.write(names[i].getBytes("UTF-8"));
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