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From "Xiaobing Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12957) Limit the number of outstanding async calls
Date Fri, 29 Apr 2016 22:05:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15264855#comment-15264855
] 

Xiaobing Zhou commented on HADOOP-12957:
----------------------------------------

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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