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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