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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11772) RPC Invoker relies on static ClientCache which has synchronized(this) blocks
Date Tue, 07 Apr 2015 19:56:14 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11772?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483923#comment-14483923
] 

Gopal V commented on HADOOP-11772:
----------------------------------

[~ajisakaa]: added to today's builds.

> RPC Invoker relies on static ClientCache which has synchronized(this) blocks
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-11772
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11772
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ipc, performance
>            Reporter: Gopal V
>            Assignee: Akira AJISAKA
>         Attachments: HADOOP-11772-001.patch, HADOOP-11772-wip-001.patch, HADOOP-11772-wip-002.patch,
dfs-sync-ipc.png, sync-client-bt.png, sync-client-threads.png
>
>
> {code}
>   private static ClientCache CLIENTS=new ClientCache();
> ...
>     this.client = CLIENTS.getClient(conf, factory);
> {code}
> Meanwhile in ClientCache
> {code}
> public synchronized Client getClient(Configuration conf,
>       SocketFactory factory, Class<? extends Writable> valueClass) {
> ...
>    Client client = clients.get(factory);
>     if (client == null) {
>       client = new Client(valueClass, conf, factory);
>       clients.put(factory, client);
>     } else {
>       client.incCount();
>     }
> {code}
> All invokers end up calling these methods, resulting in IPC clients choking up.
> !sync-client-threads.png!
> !sync-client-bt.png!
> !dfs-sync-ipc.png!



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