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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14520) WASB: Block compaction for Azure Block Blobs
Date Thu, 31 Aug 2017 20:58:00 GMT

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

Steve Loughran updated HADOOP-14520:
------------------------------------
    Status: Patch Available  (was: Open)

> 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-14520-006.patch, HADOOP-14520-008.patch, HADOOP-14520-009.patch,
HADOOP-14520-05.patch, HADOOP_14520_07.patch, HADOOP_14520_08.patch, HADOOP_14520_09.patch,
HADOOP-14520-patch-07-08.diff, HADOOP-14520-patch-07-09.diff
>
>
> 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_07.patch
> tested endpoint: fs.azure.account.key.hdfs4.blob.core.windows.net
> Tests run: 777, Failures: 0, Errors: 0, Skipped: 155



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