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From "Mit Desai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6755) Make DFSOutputStream more efficient
Date Fri, 25 Jul 2014 16:32:39 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mit Desai updated HDFS-6755:
----------------------------

    Issue Type: Improvement  (was: Bug)

> Make DFSOutputStream more efficient
> -----------------------------------
>
>                 Key: HDFS-6755
>                 URL: https://issues.apache.org/jira/browse/HDFS-6755
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.6.0
>            Reporter: Mit Desai
>            Assignee: Mit Desai
>
> Following code in DFSOutputStream may have an unnecessary sleep.
> {code}
> try {
>           Thread.sleep(localTimeout);
>           if (retries == 0) {
>             throw new IOException("Unable to close file because the last block"
>                 + " does not have enough number of replicas.");
>           }
>           retries--;
>           localTimeout *= 2;
>           if (Time.now() - localstart > 5000) {
>             DFSClient.LOG.info("Could not complete " + src + " retrying...");
>           }
>         } catch (InterruptedException ie) {
>           DFSClient.LOG.warn("Caught exception ", ie);
>         }
> {code}
> Currently, the code sleeps before throwing an exception which should not be the case.
> The sleep time gets doubled on every iteration, which can make a significant effect if
there are more than one iterations. We need to move the sleep down after decrementing retries.



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