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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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Matteo Bertozzi updated HBASE-7970:
-----------------------------------
Description:
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}
was:
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()
> Improve file descriptor usage: Currently, there are two fds per one storefile
> -----------------------------------------------------------------------------
>
> Key: HBASE-7970
> URL: https://issues.apache.org/jira/browse/HBASE-7970
> Project: HBase
> Issue Type: Sub-task
> Reporter: Himanshu Vashishtha
>
> 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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