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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14535) wasb: implement high-performance random access and seek of block blobs
Date Tue, 11 Jul 2017 21:02:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082978#comment-16082978
] 

Hudson commented on HADOOP-14535:
---------------------------------

SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #11989 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/11989/])
HADOOP-14535 wasb: implement high-performance random access and seek of (stevel: rev d670c3a4da7dd80dccf6c6308603bb3bb013b3b0)
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystemHelper.java
* (edit) hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/TestAzureConcurrentOutOfBandIo.java
* (add) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/BlockBlobInputStream.java
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/SecureStorageInterfaceImpl.java
* (edit) hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/MockStorageInterface.java
* (edit) hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/AzureBlobStorageTestAccount.java
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeAzureFileSystem.java
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/StorageInterfaceImpl.java
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/AzureNativeFileSystemStore.java
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/StorageInterface.java
* (edit) hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/NativeFileSystemStore.java
* (add) hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/TestBlockBlobInputStream.java
* (edit) hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/ContractTestUtils.java


> wasb: implement high-performance random access and seek of block blobs
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-14535
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14535
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/azure
>            Reporter: Thomas
>            Assignee: Thomas
>             Fix For: 2.9.0, 3.0.0-beta1
>
>         Attachments: 0001-Random-access-and-seek-imporvements-to-azure-file-system.patch,
0003-Random-access-and-seek-imporvements-to-azure-file-system.patch, 0004-Random-access-and-seek-imporvements-to-azure-file-system.patch,
0005-Random-access-and-seek-imporvements-to-azure-file-system.patch, HADOOP-14535-006.patch
>
>
> This change adds a seek-able stream for reading block blobs to the wasb:// file system.
> If seek() is not used or if only forward seek() is used, the behavior of read() is unchanged.
> That is, the stream is optimized for sequential reads by reading chunks (over the network)
in
> the size specified by "fs.azure.read.request.size" (default is 4 megabytes).
> If reverse seek() is used, the behavior of read() changes in favor of reading the actual
number
> of bytes requested in the call to read(), with some constraints.  If the size requested
is smaller
> than 16 kilobytes and cannot be satisfied by the internal buffer, the network read will
be 16
> kilobytes.  If the size requested is greater than 4 megabytes, it will be satisfied by
sequential
> 4 megabyte reads over the network.
> This change improves the performance of FSInputStream.seek() by not closing and re-opening
the
> stream, which for block blobs also involves a network operation to read the blob metadata.
Now
> NativeAzureFsInputStream.seek() checks if the stream is seek-able and moves the read
position.
> [^attachment-name.zip]



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