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https://issues.apache.org/jira/browse/HADOOP-14520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16161580#comment-16161580
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Georgi Chalakov commented on HADOOP-14520:
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Thanks for the review Steve!
> 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: 2.7.4
> Reporter: Georgi Chalakov
> Assignee: Georgi Chalakov
> Fix For: 2.0.6-alpha, 3.0.0-beta1
>
> 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_10.patch,
> hadoop-14520-branch-2-010.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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