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https://issues.apache.org/jira/browse/HDFS-13232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16387106#comment-16387106
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Íñigo Goiri commented on HDFS-13232:
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This together with HDFS-13230 shows a clear hole in the unit testing for the
connection manager.
> RBF: ConnectionPool should return first usable connection
> ---------------------------------------------------------
>
> Key: HDFS-13232
> URL: https://issues.apache.org/jira/browse/HDFS-13232
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Wei Yan
> Assignee: Wei Yan
> Priority: Minor
>
> In current ConnectionPool.getConnection(), it will return the first active
> connection:
> {code:java}
> for (int i=0; i<size; i++) {
> int index = (threadIndex + i) % size;
> conn = tmpConnections.get(index);
> if (conn != null && !conn.isUsable()) {
> return conn;
> }
> }
> {code}
> Here "!conn.isUsable()" should be "conn.isUsable()".
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