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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7970) Improve file descriptor usage: currently, there are two file descriptors per storefile
Date Fri, 29 Mar 2013 22:27:16 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin updated HBASE-7970:
------------------------------------

    Status: Patch Available  (was: Open)
    
> Improve file descriptor usage: currently, there are two file descriptors per storefile
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-7970
>                 URL: https://issues.apache.org/jira/browse/HBASE-7970
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Himanshu Vashishtha
>            Assignee: Sergey Shelukhin
>         Attachments: HBASE-7970-v0.patch
>
>
> This is because there are two open calls in the HFile: one with checksum and another
for without checksum support in v2:
> see the method in HFile:createReaderWithEncoding()
> {code}
> FSDataInputStream fsdis = fs.open(path);
> FSDataInputStream fsdisNoFsChecksum = fsdis;
> // If the fs is not an instance of HFileSystem, then create an
> // instance of HFileSystem that wraps over the specified fs.
> // In this case, we will not be able to avoid checksumming inside
> // the filesystem.
> if (!(fs instanceof HFileSystem)) {
>   hfs = new HFileSystem(fs);
> } else {
>   hfs = (HFileSystem)fs;
>   // open a stream to read data without checksum verification in
>   // the filesystem
>   fsdisNoFsChecksum = hfs.getNoChecksumFs().open(path);
> }
> {code}

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