flink-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2168) Add HBaseTableSource
Date Wed, 25 Jan 2017 09:19:26 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15837420#comment-15837420
] 

ASF GitHub Bot commented on FLINK-2168:
---------------------------------------

Github user ramkrish86 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3149#discussion_r97736554
  
    --- Diff: flink-connectors/flink-hbase/src/main/java/org/apache/flink/addons/hbase/HBaseTableSchema.java
---
    @@ -0,0 +1,135 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.flink.addons.hbase;
    +
    +import org.apache.flink.api.common.typeinfo.BasicArrayTypeInfo;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.util.Preconditions;
    +import org.apache.hadoop.hbase.util.Bytes;
    +import org.apache.hadoop.hbase.util.Pair;
    +
    +import java.io.Serializable;
    +import java.math.BigDecimal;
    +import java.math.BigInteger;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.HashMap;
    +import java.util.ArrayList;
    +import java.util.Date;
    +
    +/**
    + * Helps to specify an HBase Table's schema
    + */
    +public class HBaseTableSchema implements Serializable {
    +
    +	// A Map with key as column family.
    +	private final Map<String, List<Pair>> familyMap =
    +		new HashMap<String, List<Pair>>();
    +
    +	// Allowed types. This may change.
    +	// TODO : Check if the Date type should be the one in java.util or the one in java.sql
    +	private static Class[] CLASS_TYPES = {
    +		Integer.class, Short.class, Float.class, Long.class, String.class, Byte.class, Boolean.class,
Double.class, BigInteger.class, BigDecimal.class, Date.class
    +	};
    +	private static byte[] EMPTY_BYTE_ARRAY = new byte[0];
    +	public void addColumns(String family, String qualifier, TypeInformation<?> type)
{
    +		Preconditions.checkNotNull(family, "family name");
    +		Preconditions.checkNotNull(family, "qualifier name");
    +		Preconditions.checkNotNull(type, "type name");
    +		List<Pair> list = this.familyMap.get(family);
    +		if (list == null) {
    +			list = new ArrayList<Pair>();
    +		}
    +		boolean found = false;
    +		for(Class classType : CLASS_TYPES) {
    +			if(classType == type.getTypeClass()) {
    +				found = true;
    +				break;
    +			}
    +		}
    +		if(!found) {
    +			// by default it will be byte[] type only
    +			type = BasicArrayTypeInfo.BYTE_ARRAY_TYPE_INFO;
    +		}
    +		list.add(new Pair(qualifier, type));
    +		familyMap.put(family, list);
    +	}
    +
    +	public Map<String, List<Pair>> getFamilyMap() {
    +		return this.familyMap;
    +	}
    +
    +	public Object deserialize(byte[] value, TypeInformation<?> typeInfo) {
    +		if (typeInfo.isBasicType()) {
    +			if (typeInfo.getTypeClass() == Integer.class) {
    +				return Bytes.toInt(value);
    +			} else if (typeInfo.getTypeClass() == Short.class) {
    +				return Bytes.toShort(value);
    +			} else if (typeInfo.getTypeClass() == Float.class) {
    +				return Bytes.toFloat(value);
    +			} else if (typeInfo.getTypeClass() == Long.class) {
    +				return Bytes.toLong(value);
    +			} else if (typeInfo.getTypeClass() == String.class) {
    +				return Bytes.toString(value);
    +			} else if (typeInfo.getTypeClass() == Byte.class) {
    +				return value[0];
    +			} else if (typeInfo.getTypeClass() == Boolean.class) {
    +				return Bytes.toBoolean(value);
    +			} else if (typeInfo.getTypeClass() == Double.class) {
    +				return Bytes.toDouble(value);
    +			} else if (typeInfo.getTypeClass() == BigInteger.class) {
    +				return new BigInteger(value);
    +			} else if (typeInfo.getTypeClass() == BigDecimal.class) {
    +				return Bytes.toBigDecimal(value);
    +			} else if (typeInfo.getTypeClass() == Date.class) {
    +				return new Date(Bytes.toLong(value));
    +			}
    +		}
    +		return value;
    +	}
    +
    +	public Object deserializeNull(TypeInformation<?> typeInfo) {
    +		// TODO : this may need better handling.
    +		if(typeInfo.getTypeClass() ==  Integer.class) {
    --- End diff --
    
    But returning default values may not be right. I just did that here as I was not aware
of that NULL handling. When a column does not have any value then it is better we return NULL
rather than any default value. @ex00 - What do you think?


> Add HBaseTableSource
> --------------------
>
>                 Key: FLINK-2168
>                 URL: https://issues.apache.org/jira/browse/FLINK-2168
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>    Affects Versions: 0.9
>            Reporter: Fabian Hueske
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Minor
>              Labels: starter
>
> Add a {{HBaseTableSource}} to read data from a HBase table. The {{HBaseTableSource}}
should implement the {{ProjectableTableSource}} (FLINK-3848) and {{FilterableTableSource}}
(FLINK-3849) interfaces.
> The implementation can be based on Flink's {{TableInputFormat}}.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message