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Posted to common-dev@hadoop.apache.org by "Thomas Marquardt (JIRA)" <ji...@apache.org> on 2018/05/18 09:00:00 UTC

[jira] [Created] (HADOOP-15478) WASB: hflush() and hsync() regression

Thomas Marquardt created HADOOP-15478:
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             Summary: 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: 3.0.2, 2.9.0
            Reporter: Thomas Marquardt
            Assignee: Thomas Marquardt


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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