org.apache.hadoop.hive.ql.exec.errors.RegexErrorHeuristic Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.exec.errors;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import java.util.regex.Pattern;
import org.apache.hadoop.mapred.JobConf;
/**
* Simple heuristic where the query and the lines of the task log file are run
* through regular expressions to see if they resemble a known error condition.
*
* Only a single regular expression can be supplied to match the query whereas
* multiple regular expressions can be supplied to match lines from the log file.
* A mapping is maintained from the regular expression to the lines from the log
* file that it matched.
*/
public abstract class RegexErrorHeuristic implements ErrorHeuristic {
private JobConf conf = null;
// Pattern to look for in the hive query and whether it matched
private String queryRegex = null;
private boolean queryMatches = false;
// The regexes to look for in the log files
private final Set logRegexes = new HashSet();
// Mapping from the regex to lines in the log file where find() == true
private final Map> regexToLogLines = new HashMap>();
private final Map regexToPattern = new HashMap();
public RegexErrorHeuristic() {
}
protected void setQueryRegex(String queryRegex) {
this.queryRegex = queryRegex;
}
protected String getQueryRegex() {
return queryRegex;
}
protected boolean getQueryMatches() {
return queryMatches;
}
protected Set getLogRegexes() {
return this.logRegexes;
}
protected Map> getRegexToLogLines() {
return this.regexToLogLines;
}
protected JobConf getConf() {
return conf;
}
@Override
/**
* Before init is called, logRegexes and queryRegexes should be populated.
*/
public void init(String query, JobConf conf) {
this.conf = conf;
assert(queryRegex != null);
Pattern queryPattern = Pattern.compile(queryRegex, Pattern.CASE_INSENSITIVE);
queryMatches = queryPattern.matcher(query).find();
for(String regex : logRegexes) {
regexToPattern.put(regex, Pattern.compile(regex, Pattern.CASE_INSENSITIVE));
regexToLogLines.put(regex, new ArrayList());
}
}
@Override
public abstract ErrorAndSolution getErrorAndSolution();
@Override
public void processLogLine(String line) {
if(queryMatches) {
for(Entry e : regexToPattern.entrySet()) {
String regex = e.getKey();
Pattern p = e.getValue();
boolean lineMatches = p.matcher(line).find();
if(lineMatches) {
regexToLogLines.get(regex).add(line);
}
}
}
}
/**
* Resets to state before any processLogLine() calls.
*/
protected void reset() {
for(List lst : regexToLogLines.values()) {
lst.clear();
}
}
}