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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12957) Limit the number of outstanding async calls
Date Sun, 01 May 2016 20:43:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15265940#comment-15265940

Tsz Wo Nicholas Sze commented on HADOOP-12957:

The previous format string is fine, but FindBugs just mistakingly thinks '%d\n' as '%n'. Patch
v010 is posted to have the change:
String errMsg = String.format(
            "Exceeded limit of max asynchronous calls: %d, " +
            "please configure %s to adjust it.",

The findbugs warning indeed says that we should use "%n" and avoid using "\n" since "%n" is
the platform-specific line separator; see http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html
.  Anyway, removing it is good.

BTW, we should print out the configured value but not the default value, i.e. CommonConfigurationKeys.IPC_CLIENT_ASYNC_CALLS_MAX_DEFAULT
should be replaced by maxAsyncCalls.

> 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, HADOOP-12957.007.patch, HADOOP-12957.008.patch,
HADOOP-12957.009.patch, HADOOP-12957.010.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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