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https://issues.apache.org/jira/browse/HADOOP-15478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16481729#comment-16481729
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Steve Loughran commented on HADOOP-15478:
-----------------------------------------
As usual, which endpoint did you test against?
> WASB: hflush() and hsync() regression
> -------------------------------------
>
> Key: HADOOP-15478
> URL: https://issues.apache.org/jira/browse/HADOOP-15478
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Affects Versions: 2.9.0, 3.0.2
> Reporter: Thomas Marquardt
> Assignee: Thomas Marquardt
> Priority: Major
> Attachments: HADOOP-15478.001.patch
>
>
> HADOOP-14520 introduced a regression in hflush() and hsync(). Previously,
> for the default case where users upload data as block blobs, these were
> no-ops. Unfortunately, HADOOP-14520 accidentally implemented hflush() and
> hsync() by default, so any data buffered in the stream is immediately
> uploaded to storage. This new behavior is undesirable, because block blobs
> have a limit of 50,000 blocks. Spark users are now seeing failures due to
> exceeding the block limit, since Spark frequently invokes hflush().
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