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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7456) Connection with RemoteException is not removed from cached HashTable and cause memory leak
Date Tue, 12 Jul 2011 03:07:01 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063685#comment-13063685

Luke Lu commented on HADOOP-7456:

Is it still a problem in 0.20.203? If so, we need to fix it in 20x as well.

> Connection with RemoteException is not removed from cached HashTable and cause memory
> ------------------------------------------------------------------------------------------
>                 Key: HADOOP-7456
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7456
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.20.2
>            Reporter: Angelo K. Huang
> In a long running system like Oozie, we use hadoop client APIs, such as FileSystem.exists(),
to check files exist on hdfs or not to kick off a user job. But in a production environment,
user sometimes gives wrong or invalid format of file/directory paths. In that case, after
server was up for couple days, we found around 80% of memory were taken away by hadoop ipc
client connections. In one of the connections, there was a hashtable contains 200k entries.
We cross-checked Hadoop code and found out that in org.apache.hadoop.ipc.Client.receiveResponse(),
if state if fatal, the call object does not remove from the hashtable (calls) and keeps in
the memory until system throws OutOfMemory error or crash. The code in question is here :
> * org.apache.hadoop.ipc.Client.receiveResponse()
>  } else if (state == Status.FATAL.state) {
>           // Close the connection
>           markClosed(new RemoteException(WritableUtils.readString(in), 
>                                          WritableUtils.readString(in)));
>  }

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