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Date: Wed, 16 Aug 2017 18:33:00 +0000 (UTC)
From: "Thomas Marquardt (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-14520) WASB: Block compaction for Azure
 Block Blobs
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archived-at: Wed, 16 Aug 2017 18:33:11 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-14520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16129216#comment-16129216 ] 

Thomas Marquardt commented on HADOOP-14520:
-------------------------------------------

I started working on an update yesterday, since Georgi is on vacation.  I'll provide an updated patch and review soon.

> WASB: Block compaction for Azure Block Blobs
> --------------------------------------------
>
>                 Key: HADOOP-14520
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14520
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/azure
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Georgi Chalakov
>            Assignee: Georgi Chalakov
>         Attachments: HADOOP-14520-05.patch
>
>
> Block Compaction for WASB allows uploading new blocks for every hflush/hsync call. When the number of blocks is above 32000, next hflush/hsync triggers the block compaction process. Block compaction replaces a sequence of blocks with one block. From all the sequences with total length less than 4M, compaction chooses the longest one. It is a greedy algorithm that preserve all potential candidates for the next round. Block Compaction for WASB increases data durability and allows using block blobs instead of page blobs. By default, block compaction is disabled. Similar to the configuration for page blobs, the client needs to specify HDFS folders where block compaction over block blobs is enabled. 
> Results for HADOOP-14520-05.patch
> tested endpoint: fs.azure.account.key.hdfs4.blob.core.windows.net
> Tests run: 707, Failures: 0, Errors: 0, Skipped: 119


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