Improve backup-node sync performance by wrapping RPC parameters
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Key: HDFS-1583
URL: https://issues.apache.org/jira/browse/HDFS-1583
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Reporter: Liyin Liang
The journal edit records are sent by the active name-node to the backup-node
with RPC:
{code:}
public void journal(NamenodeRegistration registration,
int jAction,
int length,
byte[] records) throws IOException;
{code}
During the name-node throughput benchmark, the size of byte array _records_ is
around *8000*. Then the serialization and deserialization is time-consuming. I
wrote a simple application to test RPC with byte array parameter. When the size
got to 8000, each RPC call need about 6 ms. While name-node sync 8k byte to
local disk only need 0.3~0.4ms.
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