Jan Kunigk created HDFS-4089:
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Summary: SyncBehindWrites uses wrong flags on sync_file_range
Key: HDFS-4089
URL: https://issues.apache.org/jira/browse/HDFS-4089
Project: Hadoop HDFS
Issue Type: Bug
Components: data-node, ha
Reporter: Jan Kunigk
Priority: Minor
Hi, I stumbled upon this while trying to understand the append design recently.
I am assuming when SyncBehindWrites is enabled we do indeed want to do a
complete sync after each write. In that case the implementation seems wrong to
me.
Here's a comment from the manpage of sync_file_range on the usage of the
SYNC_FILE_RANGE_WRITE flag in solitude: "This is an asynchronous flush-to-disk
operation. This is not suitable for data integrity operations." I don't know
why this syscall is invoked here instead of just fsync
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