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From "Rajesh Balamohan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14478) Optimize NativeAzureFsInputStream for positional reads
Date Fri, 02 Jun 2017 13:24:04 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rajesh Balamohan updated HADOOP-14478:
    Attachment: HADOOP-14478.002.patch

Attaching .2 version with fixes in seek().  Also attaching test results from hadoop-azure

My azure machine and endpoints are hosted in "Japan West region"


hdiuser@hn0:~/hadoop/hadoop-tools/hadoop-azureāŸ« mvn test

Tests run: 16, Failures: 0, Errors: 0, Skipped: 16, Time elapsed: 0.421 sec - in org.apache.hadoop.fs.azure.TestFileSystemOperationExceptionHandling
Running org.apache.hadoop.fs.azure.TestAzureConcurrentOutOfBandIo
Tests run: 1, Failures: 0, Errors: 0, Skipped: 1, Time elapsed: 0.361 sec - in org.apache.hadoop.fs.azure.TestAzureConcurrentOutOfBandIo
Running org.apache.hadoop.fs.azure.TestAzureFileSystemErrorConditions
Tests run: 6, Failures: 0, Errors: 0, Skipped: 3, Time elapsed: 0.939 sec - in org.apache.hadoop.fs.azure.TestAzureFileSystemErrorConditions

Results :

Tests run: 703, Failures: 0, Errors: 0, Skipped: 436

[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:50 min
[INFO] Finished at: 2017-06-02T13:08:42+00:00
[INFO] Final Memory: 29M/1574M
[INFO] ------------------------------------------------------------------------

> Optimize NativeAzureFsInputStream for positional reads
> ------------------------------------------------------
>                 Key: HADOOP-14478
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14478
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs/azure
>            Reporter: Rajesh Balamohan
>         Attachments: HADOOP-14478.001.patch, HADOOP-14478.002.patch
> Azure's {{BlobbInputStream}} internally buffers 4 MB of data irrespective of the data
length requested for. This would be beneficial for sequential reads. However, for positional
reads (seek to specific location, read x number of bytes, seek back to original location)
this may not be beneficial and might even download lot more data which are not used later.
> It would be good to override {{readFully(long position, byte[] buffer, int offset, int
length)}} for {{NativeAzureFsInputStream}} and make use of {{mark(readLimit)}} as a hint to
Azure's BlobInputStream.
> BlobInputStream reference: https://github.com/Azure/azure-storage-java/blob/master/microsoft-azure-storage/src/com/microsoft/azure/storage/blob/BlobInputStream.java#L448
> BlobInputStream can consider this as a hint later to determine the amount of data to
be read ahead. Changes to BlobInputStream would not be addressed in this JIRA.

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