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From "Plamen Jeliazkov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3683) Edit log replay progress indicator shows >100% complete
Date Fri, 24 Aug 2012 01:50:42 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Plamen Jeliazkov updated HDFS-3683:
-----------------------------------

    Status: Patch Available  (was: Open)
    
> Edit log replay progress indicator shows >100% complete
> -------------------------------------------------------
>
>                 Key: HDFS-3683
>                 URL: https://issues.apache.org/jira/browse/HDFS-3683
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Todd Lipcon
>            Assignee: Plamen Jeliazkov
>            Priority: Minor
>         Attachments: HDFS_3683.patch, HDFS_3683.patch
>
>
> When loading a large edit log, the NameNode prints a percentage-complete progress indicator:
> {code}
>               int percent = Math.round((float)lastAppliedTxId / numTxns * 100);
>               LOG.info("replaying edit log: " + lastAppliedTxId + "/" + numTxns
>                   + " transactions completed. (" + percent + "%)");
> {code}
> But the percentage is calculated incorrectly, since it divides the transaction ID by
the number of expected transactions. This only works when starting at txid 1. (eg if we are
loading 1000 transaction starting at txid 1000, the indicator will start at 100% and go to
200%)

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