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From "Georgi Chalakov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14520) WASB: Block compaction for Azure Block Blobs
Date Sun, 09 Jul 2017 08:44:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Georgi Chalakov updated HADOOP-14520:
-------------------------------------
    Release Note: Block Compaction for Azure Block Blobs When the number of blocks in a block
blob is above 32000, the process of compaction replaces a sequence of small blocks with with
one big block.   (was: Block Compaction for WASB. When the number of blocks in a block blob
is above 32000, the process of compaction replaces a sequence of small blocks with with one
big block. )

> 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-14520-01.patch, HADOOP-14520-01-test.txt, HADOOP-14520-03.patch,
HADOOP-14520-4.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-14520-04.patch
> tested endpoint: fs.azure.account.key.hdfs4.blob.core.windows.net
> Tests run: 701, Failures: 0, Errors: 0, Skipped: 119



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