[jira] Resolved: (HADOOP-6639) FileSystem.get(..) may be blocked for a long time

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-6639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE resolved HADOOP-6639.
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    Resolution: Duplicate

> FileSystem.get(..) may be blocked for a long time
> -------------------------------------------------
>
>                 Key: HADOOP-6639
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6639
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>            Reporter: Tsz Wo (Nicholas), SZE
>
> When FileSystem cache is enabled, FileSystem.get(..) will call FileSystem.Cache.get(..), which is a synchronized method.  If the lookup fails, a new instance will be initialized.   Depends on the FileSystem subclass implementation, the initialization may take a long time.  In such case, the FileSystem.Cache lock will be hold and all calls to FileSystem.get(..) by other threads will be blocked for a long time.
> In particular, the DistributedFileSystem initialization may take a long time since there are retries.  It is even worst if the socket timeout is set to a large value.

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