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https://issues.apache.org/jira/browse/HDFS-5167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877346#comment-13877346
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Tsuyoshi OZAWA commented on HDFS-5167:
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Thanks for your advice, [~jingzhao].
I've had some times to use LossyRetryInvocationHandler based on your advice. I
also consulted TestLossyRetryInvocationHandler.java to use it. However, I still
cannot use it. I appreciate if you can have a chance to answer my questions.
1. I confirmed that TestLossyRetryInvocationHandler doesn't create
LossyRetryInvocationHandler by using debugger. Is this assumed code path?
2. I confirmed that we cannot use LossyRetryInvocationHandler just by setting
DFSConfigKeys#DFS_CLIENT_TEST_DROP_NAMENODE_RESPONSE_NUM_KEY to positive. Is
there missing point?
My code which I'm developing is as follows: https://gist.github.com/oza/8536682
> Add metrics about the NameNode retry cache
> ------------------------------------------
>
> Key: HDFS-5167
> URL: https://issues.apache.org/jira/browse/HDFS-5167
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ha, namenode
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Jing Zhao
> Assignee: Tsuyoshi OZAWA
> Priority: Minor
> Attachments: HDFS-5167.1.patch, HDFS-5167.10.patch,
> HDFS-5167.2.patch, HDFS-5167.3.patch, HDFS-5167.4.patch, HDFS-5167.5.patch,
> HDFS-5167.6.patch, HDFS-5167.6.patch, HDFS-5167.7.patch, HDFS-5167.8.patch,
> HDFS-5167.9-2.patch, HDFS-5167.9.patch
>
>
> It will be helpful to have metrics in NameNode about the retry cache, such as
> the retry count etc.
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