Enhancements to DFSClient to support flushing data at any point in time
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Key: HADOOP-2657
URL: https://issues.apache.org/jira/browse/HADOOP-2657
Project: Hadoop
Issue Type: New Feature
Components: dfs
Reporter: dhruba borthakur
The HDFS Append Design (HADOOP-1700) requires that there be a public API to
flush data written to a HDFS file that can be invoked by an application. This
API (popularly referred to a fflush(OutputStream)) will ensure that data
written to the DFSOutputStream is flushed to datanodes and any required
metadata is persisted on Namenode.
This API has to handle the case when the client decides to flush after writing
data that is not a exact multiple of io.bytes.per.checksum.
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