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https://issues.apache.org/jira/browse/HADOOP-17731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Kyle Purtell updated HADOOP-17731:
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Component/s: ipc
> IPC client is stuck, waiting for connections map to be empty
> ------------------------------------------------------------
>
> Key: HADOOP-17731
> URL: https://issues.apache.org/jira/browse/HADOOP-17731
> Project: Hadoop Common
> Issue Type: Bug
> Components: ipc
> Affects Versions: 2.10.1
> Reporter: Kiran Kumar Maturi
> Priority: Major
>
> In our cluster we have observed when close command is issued to Datanode, It
> is stuck indefinitely waiting for connections map to be empty for some reason
> the map is not empty even after the connections have closed. [code
> link|https://github.com/apache/hadoop/blob/branch-2.10.1/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java#L1360].
>
> Instead of infinite wait a timed wait (based on retries or timeout) would
> enable to shutdown the datanode in timely manner.
> {code:java}
> for (Connection conn : connections.values()) {
> conn.interrupt();
> conn.interruptConnectingThread();
> }
>
> // wait until all connections are closed
> while (!connections.isEmpty()) {
> try {
> Thread.sleep(STOP_SLEEP_TIME_MS);
> } catch (InterruptedException e) {
> }
> }
> {code}
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