[
https://issues.apache.org/jira/browse/HADOOP-16403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16903780#comment-16903780
]
Jinglun commented on HADOOP-16403:
----------------------------------
Hi [~jojochuang], patch-006 is ready now, do you have time to review it ?
Thanks a lot !
> Start a new statistical rpc queue and make the Reader's pendingConnection
> queue runtime-replaceable
> ---------------------------------------------------------------------------------------------------
>
> Key: HADOOP-16403
> URL: https://issues.apache.org/jira/browse/HADOOP-16403
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Jinglun
> Assignee: Jinglun
> Priority: Major
> Attachments: HADOOP-16403-How_MetricLinkedBlockingQueue_Works.pdf,
> HADOOP-16403.001.patch, HADOOP-16403.002.patch, HADOOP-16403.003.patch,
> HADOOP-16403.004.patch, HADOOP-16403.005.patch, HADOOP-16403.006.patch,
> MetricLinkedBlockingQueueTest.pdf
>
>
> I have an HA cluster with 2 NameNodes. The NameNode's meta is quite big so
> after the active dead, it takes the standby more than 40s to become active.
> Many requests(tcp connect request and rpc request) from Datanodes, clients
> and zkfc timed out and start retrying. The suddenly request flood lasts for
> the next 2 minutes and finally all requests are either handled or run out of
> retry times.
> Adjusting the rpc related settings might power the NameNode and solve this
> problem and the key point is finding the bottle neck. The rpc server can be
> described as below:
> {noformat}
> Listener -> Readers' queues -> Readers -> callQueue -> Handlers{noformat}
> By sampling some failed clients, I find many of them got
> ConnectTimeoutException. It's caused by a 20s un-responded tcp connect
> request. I think may be the reader queue is full and block the listener from
> handling new connections. Both slow handlers and slow readers can block the
> whole processing progress, and I need to know who it is. I think *a queue
> that computes the qps, write log when the queue is full and could be replaced
> easily* will help.
> I find the nice work HADOOP-10302 implementing a runtime-swapped queue.
> Using it at Reader's queue makes the reader queue runtime-swapped
> automatically. The qps computing job could be done by implementing a subclass
> of LinkedBlockQueue that does the computing job while put/take/... happens.
> The qps data will show on jmx.
>
>
--
This message was sent by Atlassian JIRA
(v7.6.14#76016)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
