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https://issues.apache.org/jira/browse/HADOOP-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15264855#comment-15264855
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Xiaobing Zhou commented on HADOOP-12957:
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Thank you for review. Patch v006 is posted to
1. make asyncCallCounter final
2. add extra message for AsyncCallLimitExceededException
3. removed one-time call guarantee for Callable.
I think we might need to keep
ClientNamenodeProtocolTranslatorPB#RETURN_VALUE_CALLBACK. Without this, the
logic on how to extract result from message has to be moved to
AsyncDistributedFileSystem, which makes AsyncDistributedFileSystem quite
heavy-weight.
> Limit the number of outstanding async calls
> -------------------------------------------
>
> Key: HADOOP-12957
> URL: https://issues.apache.org/jira/browse/HADOOP-12957
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
> Attachments: HADOOP-12957-HADOOP-12909.000.patch,
> HADOOP-12957-combo.000.patch, HADOOP-12957.001.patch, HADOOP-12957.002.patch,
> HADOOP-12957.003.patch, HADOOP-12957.004.patch, HADOOP-12957.005.patch,
> HADOOP-12957.006.patch
>
>
> In async RPC, if the callers don't read replies fast enough, the buffer
> storing replies could be used up. This is to propose limiting the number of
> outstanding async calls to eliminate the issue.
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