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https://issues.apache.org/jira/browse/HBASE-7970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin updated HBASE-7970:
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Attachment: HBASE-7970-v2.1.patch
attaching... (for QA)
> 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, HBASE-7970-v1.patch,
> HBASE-7970-v2.1.patch, HBASE-7970-v2.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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