eagle-core/eagle-query/eagle-entity-base/src/main/java/org/apache/eagle/log/entity/old/HBaseLogReader.java - eagle - Git at Google

 /*
  * 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.eagle.log.entity.old;

 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.SortedMap;
 import java.util.TreeMap;

 import org.apache.eagle.common.config.EagleConfigFactory;
 import org.apache.eagle.log.entity.InternalLog;
 import org.apache.eagle.log.entity.LogReader;
 import org.apache.hadoop.hbase.client.HTableFactory;
 import org.apache.hadoop.hbase.client.HTableInterface;
 import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.ResultScanner;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
 import org.apache.hadoop.hbase.filter.FilterList;
 import org.apache.hadoop.hbase.filter.RegexStringComparator;
 import org.apache.hadoop.hbase.filter.RowFilter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 import org.apache.eagle.common.ByteUtil;
 import org.apache.eagle.common.EagleBase64Wrapper;

 public class HBaseLogReader implements LogReader {
     private static Logger LOG = LoggerFactory.getLogger(HBaseLogReader.class);

     protected byte[][] qualifiers;
     private HTableInterface tbl;
     private byte[] startKey;
     private byte[] stopKey;
     protected Map<String, List<String>> searchTags;

     private ResultScanner rs;
     private boolean isOpen = false;

     private Schema schema;

     public HBaseLogReader(Schema schema, Date startTime, Date endTime, Map<String, List<String>> searchTags,
                           String lastScanKey, byte[][] outputQualifier) {
         this.schema = schema;
         this.qualifiers = outputQualifier;
         this.startKey = buildRowKey(schema.getPrefix(), startTime);
         if (lastScanKey == null) {
             this.stopKey = buildRowKey(schema.getPrefix(), endTime);
         } else {
             // build stop key
             this.stopKey = EagleBase64Wrapper.decode(lastScanKey);
             // concat byte 0 to exclude this stopKey
             this.stopKey = ByteUtil.concat(this.stopKey, new byte[] { 0 });
         }
         this.searchTags = searchTags;
     }

     /**
      * TODO If the required field is null for a row, then this row will not be fetched. That could be a
      * problem for counting Need another version of read to strictly get the number of rows which will return
      * all the columns for a column family
      */
     @Override
     public void open() throws IOException {
         if (isOpen) {
             return; // silently return
         }
         try {
             tbl = EagleConfigFactory.load().getHTable(schema.getTable());
         } catch (RuntimeException ex) {
             throw new IOException(ex);
         }

         String rowkeyRegex = buildRegex2(searchTags);
         RegexStringComparator regexStringComparator = new RegexStringComparator(rowkeyRegex);
         regexStringComparator.setCharset(Charset.forName("ISO-8859-1"));
         RowFilter filter = new RowFilter(CompareOp.EQUAL, regexStringComparator);
         FilterList filterList = new FilterList();
         filterList.addFilter(filter);
         Scan s1 = new Scan();
         // reverse timestamp, startRow is stopKey, and stopRow is startKey
         s1.setStartRow(stopKey);
         s1.setStopRow(startKey);
         s1.setFilter(filterList);
         // TODO the # of cached rows should be minimum of (pagesize and 100)
         s1.setCaching(100);
         // TODO not optimized for all applications
         s1.setCacheBlocks(true);
         // scan specified columnfamily and qualifiers
         for (byte[] qualifier : qualifiers) {
             s1.addColumn(schema.getColumnFamily().getBytes(), qualifier);
         }
         rs = tbl.getScanner(s1);
         isOpen = true;
     }

     @Override
     public void close() throws IOException {
         if (tbl != null) {
             new HTableFactory().releaseHTableInterface(tbl);
         }
         if (rs != null) {
             rs.close();
         }
     }

     public void flush() throws IOException {
         tbl.flushCommits();
     }

     private byte[] buildRowKey(String appName, Date t) {
         byte[] key = new byte[4 + 8];
         byte[] b = ByteUtil.intToBytes(appName.hashCode());
         System.arraycopy(b, 0, key, 0, 4);
         // reverse timestamp
         long ts = Long.MAX_VALUE - t.getTime();
         System.arraycopy(ByteUtil.longToBytes(ts), 0, key, 4, 8);
         return key;
     }

     /**
      * one search tag may have multiple values which have OR relationship, and relationship between different
      * search tags is AND the query is like "(TAG1=value11 OR TAG1=value12) AND TAG2=value2".
      *
      * @param tags
      * @return
      */
     protected String buildRegex2(Map<String, List<String>> tags) {
         // TODO need consider that \E could be part of tag, refer to
         // https://github.com/OpenTSDB/opentsdb/blob/master/src/core/TsdbQuery.java
         SortedMap<Integer, List<Integer>> tagHash = new TreeMap<Integer, List<Integer>>();

         for (Map.Entry<String, List<String>> entry : tags.entrySet()) {
             String tagName = entry.getKey();
             List<String> stringValues = entry.getValue();
             List<Integer> hashValues = new ArrayList<Integer>(1);
             for (String value : stringValues) {
                 hashValues.add(value.hashCode());
             }
             tagHash.put(tagName.hashCode(), hashValues);
         }
         // <tag1:3><value1:3> ... <tagn:3><valuen:3>
         StringBuilder sb = new StringBuilder();
         sb.append("(?s)");
         sb.append("^(?:.{12})");
         sb.append("(?:.{").append(8).append("})*"); // for any number of tags
         for (Map.Entry<Integer, List<Integer>> entry : tagHash.entrySet()) {
             try {
                 sb.append("\\Q");
                 sb.append(new String(ByteUtil.intToBytes(entry.getKey()), "ISO-8859-1")).append("\\E");
                 List<Integer> hashValues = entry.getValue();
                 sb.append("(?:");
                 boolean first = true;
                 for (Integer value : hashValues) {
                     if (!first) {
                         sb.append('|');
                     }
                     sb.append("\\Q");
                     sb.append(new String(ByteUtil.intToBytes(value), "ISO-8859-1"));
                     sb.append("\\E");
                     first = false;
                 }
                 sb.append(")");
                 sb.append("(?:.{").append(8).append("})*"); // for any number of tags
             } catch (Exception ex) {
                 LOG.error("Constructing regex error", ex);
             }
         }
         sb.append("$");
         if (LOG.isDebugEnabled()) {
             LOG.debug("Pattern is " + sb.toString());
         }
         return sb.toString();
     }

     @Override
     public InternalLog read() throws IOException {
         if (rs == null) {
             throw new IllegalArgumentException("ResultScanner must be initialized before reading");
         }

         InternalLog t = null;

         Result r = rs.next();
         if (r != null) {
             byte[] row = r.getRow();
             // skip the first 4 bytes : prefix
             long timestamp = ByteUtil.bytesToLong(row, 4);
             // reverse timestamp
             timestamp = Long.MAX_VALUE - timestamp;
             int count = 0;
             if (qualifiers != null) {
                 count = qualifiers.length;
             }
             byte[][] values = new byte[count][];
             Map<String, byte[]> allQualifierValues = new HashMap<String, byte[]>();
             for (int i = 0; i < count; i++) {
                 // TODO if returned value is null, it means no this column for this row, so why set null to
                 // the object?
                 values[i] = r.getValue(schema.getColumnFamily().getBytes(), qualifiers[i]);
                 allQualifierValues.put(new String(qualifiers[i]), values[i]);
             }
             t = buildObject(row, timestamp, allQualifierValues);
         }

         return t;
     }

     public InternalLog buildObject(byte[] row, long timestamp, Map<String, byte[]> allQualifierValues) {
         InternalLog alertDetail = new InternalLog();
         String myRow = EagleBase64Wrapper.encodeByteArray2URLSafeString(row);
         alertDetail.setEncodedRowkey(myRow);
         alertDetail.setPrefix(schema.getPrefix());
         alertDetail.setSearchTags(searchTags);
         alertDetail.setTimestamp(timestamp);

         Map<String, byte[]> logQualifierValues = new HashMap<String, byte[]>();
         Map<String, String> logTags = new HashMap<String, String>();
         for (Map.Entry<String, byte[]> entry : allQualifierValues.entrySet()) {
             if (schema.isTag(entry.getKey())) {
                 if (entry.getValue() != null) {
                     logTags.put(entry.getKey(), new String(entry.getValue()));
                 }
             } else {
                 logQualifierValues.put(entry.getKey(), entry.getValue());
             }
         }
         alertDetail.setQualifierValues(logQualifierValues);
         alertDetail.setTags(logTags);
         return alertDetail;
     }
 }
	/*
	* 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.eagle.log.entity.old;

	import java.io.IOException;
	import java.nio.charset.Charset;
	import java.util.ArrayList;
	import java.util.Date;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.SortedMap;
	import java.util.TreeMap;

	import org.apache.eagle.common.config.EagleConfigFactory;
	import org.apache.eagle.log.entity.InternalLog;
	import org.apache.eagle.log.entity.LogReader;
	import org.apache.hadoop.hbase.client.HTableFactory;
	import org.apache.hadoop.hbase.client.HTableInterface;
	import org.apache.hadoop.hbase.client.Result;
	import org.apache.hadoop.hbase.client.ResultScanner;
	import org.apache.hadoop.hbase.client.Scan;
	import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp;
	import org.apache.hadoop.hbase.filter.FilterList;
	import org.apache.hadoop.hbase.filter.RegexStringComparator;
	import org.apache.hadoop.hbase.filter.RowFilter;
	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;

	import org.apache.eagle.common.ByteUtil;
	import org.apache.eagle.common.EagleBase64Wrapper;

	public class HBaseLogReader implements LogReader {
	private static Logger LOG = LoggerFactory.getLogger(HBaseLogReader.class);

	protected byte[][] qualifiers;
	private HTableInterface tbl;
	private byte[] startKey;
	private byte[] stopKey;
	protected Map<String, List<String>> searchTags;

	private ResultScanner rs;
	private boolean isOpen = false;

	private Schema schema;

	public HBaseLogReader(Schema schema, Date startTime, Date endTime, Map<String, List<String>> searchTags,
	String lastScanKey, byte[][] outputQualifier) {
	this.schema = schema;
	this.qualifiers = outputQualifier;
	this.startKey = buildRowKey(schema.getPrefix(), startTime);
	if (lastScanKey == null) {
	this.stopKey = buildRowKey(schema.getPrefix(), endTime);
	} else {
	// build stop key
	this.stopKey = EagleBase64Wrapper.decode(lastScanKey);
	// concat byte 0 to exclude this stopKey
	this.stopKey = ByteUtil.concat(this.stopKey, new byte[] { 0 });
	}
	this.searchTags = searchTags;
	}

	/**
	* TODO If the required field is null for a row, then this row will not be fetched. That could be a
	* problem for counting Need another version of read to strictly get the number of rows which will return
	* all the columns for a column family
	*/
	@Override
	public void open() throws IOException {
	if (isOpen) {
	return; // silently return
	}
	try {
	tbl = EagleConfigFactory.load().getHTable(schema.getTable());
	} catch (RuntimeException ex) {
	throw new IOException(ex);
	}

	String rowkeyRegex = buildRegex2(searchTags);
	RegexStringComparator regexStringComparator = new RegexStringComparator(rowkeyRegex);
	regexStringComparator.setCharset(Charset.forName("ISO-8859-1"));
	RowFilter filter = new RowFilter(CompareOp.EQUAL, regexStringComparator);
	FilterList filterList = new FilterList();
	filterList.addFilter(filter);
	Scan s1 = new Scan();
	// reverse timestamp, startRow is stopKey, and stopRow is startKey
	s1.setStartRow(stopKey);
	s1.setStopRow(startKey);
	s1.setFilter(filterList);
	// TODO the # of cached rows should be minimum of (pagesize and 100)
	s1.setCaching(100);
	// TODO not optimized for all applications
	s1.setCacheBlocks(true);
	// scan specified columnfamily and qualifiers
	for (byte[] qualifier : qualifiers) {
	s1.addColumn(schema.getColumnFamily().getBytes(), qualifier);
	}
	rs = tbl.getScanner(s1);
	isOpen = true;
	}

	@Override
	public void close() throws IOException {
	if (tbl != null) {
	new HTableFactory().releaseHTableInterface(tbl);
	}
	if (rs != null) {
	rs.close();
	}
	}

	public void flush() throws IOException {
	tbl.flushCommits();
	}

	private byte[] buildRowKey(String appName, Date t) {
	byte[] key = new byte[4 + 8];
	byte[] b = ByteUtil.intToBytes(appName.hashCode());
	System.arraycopy(b, 0, key, 0, 4);
	// reverse timestamp
	long ts = Long.MAX_VALUE - t.getTime();
	System.arraycopy(ByteUtil.longToBytes(ts), 0, key, 4, 8);
	return key;
	}

	/**
	* one search tag may have multiple values which have OR relationship, and relationship between different
	* search tags is AND the query is like "(TAG1=value11 OR TAG1=value12) AND TAG2=value2".
	*
	* @param tags
	* @return
	*/
	protected String buildRegex2(Map<String, List<String>> tags) {
	// TODO need consider that \E could be part of tag, refer to
	// https://github.com/OpenTSDB/opentsdb/blob/master/src/core/TsdbQuery.java
	SortedMap<Integer, List<Integer>> tagHash = new TreeMap<Integer, List<Integer>>();

	for (Map.Entry<String, List<String>> entry : tags.entrySet()) {
	String tagName = entry.getKey();
	List<String> stringValues = entry.getValue();
	List<Integer> hashValues = new ArrayList<Integer>(1);
	for (String value : stringValues) {
	hashValues.add(value.hashCode());
	}
	tagHash.put(tagName.hashCode(), hashValues);
	}
	// <tag1:3><value1:3> ... <tagn:3><valuen:3>
	StringBuilder sb = new StringBuilder();
	sb.append("(?s)");
	sb.append("^(?:.{12})");
	sb.append("(?:.{").append(8).append("})*"); // for any number of tags
	for (Map.Entry<Integer, List<Integer>> entry : tagHash.entrySet()) {
	try {
	sb.append("\\Q");
	sb.append(new String(ByteUtil.intToBytes(entry.getKey()), "ISO-8859-1")).append("\\E");
	List<Integer> hashValues = entry.getValue();
	sb.append("(?:");
	boolean first = true;
	for (Integer value : hashValues) {
	if (!first) {
	sb.append('\|');
	}
	sb.append("\\Q");
	sb.append(new String(ByteUtil.intToBytes(value), "ISO-8859-1"));
	sb.append("\\E");
	first = false;
	}
	sb.append(")");
	sb.append("(?:.{").append(8).append("})*"); // for any number of tags
	} catch (Exception ex) {
	LOG.error("Constructing regex error", ex);
	}
	}
	sb.append("$");
	if (LOG.isDebugEnabled()) {
	LOG.debug("Pattern is " + sb.toString());
	}
	return sb.toString();
	}

	@Override
	public InternalLog read() throws IOException {
	if (rs == null) {
	throw new IllegalArgumentException("ResultScanner must be initialized before reading");
	}

	InternalLog t = null;

	Result r = rs.next();
	if (r != null) {
	byte[] row = r.getRow();
	// skip the first 4 bytes : prefix
	long timestamp = ByteUtil.bytesToLong(row, 4);
	// reverse timestamp
	timestamp = Long.MAX_VALUE - timestamp;
	int count = 0;
	if (qualifiers != null) {
	count = qualifiers.length;
	}
	byte[][] values = new byte[count][];
	Map<String, byte[]> allQualifierValues = new HashMap<String, byte[]>();
	for (int i = 0; i < count; i++) {
	// TODO if returned value is null, it means no this column for this row, so why set null to
	// the object?
	values[i] = r.getValue(schema.getColumnFamily().getBytes(), qualifiers[i]);
	allQualifierValues.put(new String(qualifiers[i]), values[i]);
	}
	t = buildObject(row, timestamp, allQualifierValues);
	}

	return t;
	}

	public InternalLog buildObject(byte[] row, long timestamp, Map<String, byte[]> allQualifierValues) {
	InternalLog alertDetail = new InternalLog();
	String myRow = EagleBase64Wrapper.encodeByteArray2URLSafeString(row);
	alertDetail.setEncodedRowkey(myRow);
	alertDetail.setPrefix(schema.getPrefix());
	alertDetail.setSearchTags(searchTags);
	alertDetail.setTimestamp(timestamp);

	Map<String, byte[]> logQualifierValues = new HashMap<String, byte[]>();
	Map<String, String> logTags = new HashMap<String, String>();
	for (Map.Entry<String, byte[]> entry : allQualifierValues.entrySet()) {
	if (schema.isTag(entry.getKey())) {
	if (entry.getValue() != null) {
	logTags.put(entry.getKey(), new String(entry.getValue()));
	}
	} else {
	logQualifierValues.put(entry.getKey(), entry.getValue());
	}
	}
	alertDetail.setQualifierValues(logQualifierValues);
	alertDetail.setTags(logTags);
	return alertDetail;
	}
	}