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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4989) Metrics to measure sequential reads and random reads separately
Date Mon, 12 Dec 2011 22:39:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167898#comment-13167898
] 

Hudson commented on HBASE-4989:
-------------------------------

Integrated in HBase-TRUNK #2540 (See [https://builds.apache.org/job/HBase-TRUNK/2540/])
    HBASE-4989 Metrics to measure sequential reads and random reads separately

stack : 
Files : 
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFile.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV1.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/metrics/RegionServerMetrics.java

                
> Metrics to measure sequential reads and random reads separately
> ---------------------------------------------------------------
>
>                 Key: HBASE-4989
>                 URL: https://issues.apache.org/jira/browse/HBASE-4989
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>            Priority: Minor
>             Fix For: 0.94.0
>
>         Attachments: metrics1.txt
>
>
> HBase does sequential reads for compactions and positional random reads for satisfying
user's queries. It would be nice if we can measure their latencies separately. It is mostly
the random reads that dominate a transactional workload.

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