Create a file with the append flag does not work in HDFS
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Key: HDFS-609
URL: https://issues.apache.org/jira/browse/HDFS-609
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.21.0
Reporter: Hairong Kuang
Priority: Blocker
Fix For: 0.21.0
HADOOP-5438 introduced a create API with flags. There are a couple of issues
when the flag is set to be APPEND.
1. The APPEND flag does not work in HDFS. Append is not as simple as changing a
FileINode to be a FileINodeUnderConstruction. It also need to reopen the last
block for applend if last block is not full and handle crc when the last crc
chunk is not full.
2. The API is not well thought. It has parameters like replication factor and
blockSize. Those parameters do not make any sense if APPEND flag is set. But
they give an application user a wrong impression that append could change a
file's block size and replication factor.
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