Support for upgrading existing cluster to facilitate appends to HDFS files
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Key: HADOOP-2656
URL: https://issues.apache.org/jira/browse/HADOOP-2656
Project: Hadoop
Issue Type: Bug
Components: dfs
Reporter: dhruba borthakur
HADOOP-1700 describes the design for supporting appends to HDFS files. This
design requires a distributed-upgrade to existing cluster installations. The
design specifies that the DataNode persist the 8-byte BlockGenerationStamp in
the block metadata file. The upgrade code will introduce this new field in the
block metadata file and initialize this value to 0.
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