Arpit Agarwal created HDFS-6758:
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Summary: block writer should pass the expected block size to
DataXceiverServer
Key: HDFS-6758
URL: https://issues.apache.org/jira/browse/HDFS-6758
Project: Hadoop HDFS
Issue Type: Bug
Components: datanode, hdfs-client
Affects Versions: 2.4.1
Reporter: Arpit Agarwal
Assignee: Arpit Agarwal
DataXceiver initializes the block size to the default block size for the
cluster. This size is later used by the FsDatasetImpl when applying
VolumeChoosingPolicy.
{code}
// We later mutate block's generation stamp and length, but we need to
// forward the original version of the block to downstream mirrors, so
// make a copy here.
final ExtendedBlock originalBlock = new ExtendedBlock(block);
block.setNumBytes(dataXceiverServer.estimateBlockSize);
{code}
In most cases the writer can just pass the maximum expected block size to the
DN instead of having to use the cluster default.
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