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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15478) WASB: hflush() and hsync() regression
Date Mon, 21 May 2018 10:19:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Steve Loughran updated HADOOP-15478:
    Attachment: HADOOP-15478-002.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-15478-002.patch, 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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