[jira] [Commented] (CARBONDATA-208) User should be able to turn on and off the STATISTIC log

[Akash R Nilugal (Jira)]

    [ https://issues.apache.org/jira/browse/CARBONDATA-208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15515354#comment-15515354 ]

ASF GitHub Bot commented on CARBONDATA-208:
-------------------------------------------

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

    https://github.com/apache/incubator-carbondata/pull/176#discussion_r80179086
 
    --- Diff: core/src/main/java/org/apache/carbondata/core/carbon/querystatistics/QueryStatisticsRecorderImpl.java ---
    @@ -0,0 +1,172 @@
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    +package org.apache.carbondata.core.carbon.querystatistics;
    +
    +import java.io.Serializable;
    +import java.util.ArrayList;
    +import java.util.List;
    +
    +import org.apache.carbondata.common.logging.LogService;
    +import org.apache.carbondata.common.logging.LogServiceFactory;
    +
    +import static org.apache.carbondata.core.util.CarbonUtil.printLine;
    +
    +/**
    + * Class will be used to record and log the query statistics
    + */
    +public class QueryStatisticsRecorderImpl implements QueryStatisticsRecorder,Serializable {
    +
    +  private static final LogService LOGGER =
    +      LogServiceFactory.getLogService(QueryStatisticsRecorderImpl.class.getName());
    +
    +  /**
    +   * serialization version
    +   */
    +  private static final long serialVersionUID = -5719752001674467864L;
    +
    +  /**
    +   * list for statistics to record time taken
    +   * by each phase of the query for example aggregation
    +   * scanning,block loading time etc.
    +   */
    +  private List<QueryStatistic> queryStatistics;
    +
    +  /**
    +   * query with taskd
    +   */
    +  private String queryIWthTask;
    +
    +  /**
    +   * lock for log statistics table
    +   */
    +  private static final Object lock = new Object();
    +
    +  public QueryStatisticsRecorderImpl(String queryId) {
    +    queryStatistics = new ArrayList<QueryStatistic>();
    +    this.queryIWthTask = queryId;
    +  }
    +
    +  /**
    +   * Below method will be used to add the statistics
    +   *
    +   * @param statistic
    +   */
    +  public synchronized void recordStatistics(QueryStatistic statistic) {
    +    queryStatistics.add(statistic);
    +  }
    +
    +  /**
    +   * Below method will be used to log the statistic
    +   */
    +  public void logStatistics() {
    +    for (QueryStatistic statistic : queryStatistics) {
    +      LOGGER.statistic(statistic.getStatistics(queryIWthTask));
    +    }
    +  }
    +
    +  /**
    +   * Below method will be used to show statistic log as table
    +   */
    +  public void logStatisticsAsTableExecutor() {
    +    synchronized (lock) {
    --- End diff --
   
    Why this lock is required? It seems this is the only place lock is used?

> User should be able to turn on and off the STATISTIC log
> --------------------------------------------------------
>
>                 Key: CARBONDATA-208
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-208
>             Project: CarbonData
>          Issue Type: Bug
>            Reporter: Jacky Li
>            Priority: Minor
>             Fix For: 0.2.0-incubating
>
>
> Currently there are many STATISTIC log for performance tuning purpose, but it should be configurable by the user.

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