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Posted to common-issues@hadoop.apache.org by "Thomas Marquardt (JIRA)" <ji...@apache.org> on 2018/05/18 20:11:00 UTC
[jira] [Updated] (HADOOP-15478) WASB: hflush() and hsync()
regression
[ https://issues.apache.org/jira/browse/HADOOP-15478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Marquardt updated HADOOP-15478:
--------------------------------------
Attachment: HADOOP-15478.001.patch
> 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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