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