JiangHua Zhu created HDFS-16118:
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Summary: Improve the number of handlers that initialize
NameNodeRpcServer#clientRpcServer
Key: HDFS-16118
URL: https://issues.apache.org/jira/browse/HDFS-16118
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: JiangHua Zhu
When initializing NameNodeRpcServer, if the value of
dfs.namenode.lifeline.handler.count is set to be less than 0 (such as -1, of
course, this is rare), when determining the number of lifeline RPC handlers, it
will be based on dfs.namenode.handler .count * lifelineHandlerRatio is
determined.
The code can be found:
int lifelineHandlerCount = conf.getInt(
DFS_NAMENODE_LIFELINE_HANDLER_COUNT_KEY, 0);
if (lifelineHandlerCount <= 0) {
float lifelineHandlerRatio = conf.getFloat(
DFS_NAMENODE_LIFELINE_HANDLER_RATIO_KEY,
DFS_NAMENODE_LIFELINE_HANDLER_RATIO_DEFAULT);
lifelineHandlerCount = Math.max(
(int)(handlerCount * lifelineHandlerRatio), 1);
}
When this happens, the handlerCount should be subtracted from the
lifelineHandlerCount when in fact it doesn't.
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