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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6599) 2.4 addBlock is 10 to 20 times slower compared to 0.23
Date Tue, 24 Jun 2014 18:22:24 GMT
Kihwal Lee created HDFS-6599:
--------------------------------

             Summary: 2.4 addBlock is 10 to 20 times slower compared to 0.23
                 Key: HDFS-6599
                 URL: https://issues.apache.org/jira/browse/HDFS-6599
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.4.0
            Reporter: Kihwal Lee
            Priority: Critical


>From one of our busiest 0.23 clusters:
{panel}
"AddBlockAvgTime" : 0.9514711501719515
"CreateAvgTime" : 1.7564162389174
"CompleteAvgTime" : 1.3310406035056548
"BlockReceivedAndDeletedAvgTime" : 0.661210005151392
{panel}

>From a not-so-busy 2.4 cluster:
{panel}
"AddBlockAvgTime" : 10.083333333333334
"CreateAvgTime" : 1.0
"CompleteAvgTime" : 1.1111111111111112
"BlockReceivedAndDeletedAvgTime" : 0.07692307692307694
{panel}

When the 2.4 cluster gets a moderate amount of write requests, the latency is terrible. E.g.
addBlock goes upward of 60ms. 



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