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From "Akira Ajisaka (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10645) Make block report size as a metric and add this metric to datanode web ui
Date Thu, 21 Jul 2016 19:17:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388246#comment-15388246

Akira Ajisaka commented on HDFS-10645:

Thanks [~yuanbo] for the update! I'm thinking we're getting close. Some comments:
# When setting {{maxDataLength}}, would you use {{dnConf}} instead of {{dn.getConf()}}? Null
check is not needed.
# {{maxDataLength}} should be final.
# After HDFS-10287, we can use try-with-resources statement for MiniDFSCluster. Would you
use the statement instead of shutting down the cluster in finally clause?
# In Apache Hadoop, Jackson is commonly used for reading/writing json. Would you use Jackson
instead of Gson in the test code?
# Would you reverse the order of the arguments in the following assertion?
      assertEquals("maxDataLength should be exactly "
          + "the same value of ipc.maximum.data.length",
Actual value is after expected value in Assert.assertEquals(message, expected, actual).

> Make block report size as a metric and add this metric to datanode web ui
> -------------------------------------------------------------------------
>                 Key: HDFS-10645
>                 URL: https://issues.apache.org/jira/browse/HDFS-10645
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode, ui
>            Reporter: Yuanbo Liu
>            Assignee: Yuanbo Liu
>         Attachments: HDFS-10645.001.patch, HDFS-10645.002.patch, HDFS-10645.003.patch,
HDFS-10645.004.patch, Selection_047.png, Selection_048.png
> Record block report size as a metric and show it on datanode UI. It's important for administrators
to know the bottleneck of  block report, and the metric is also a good tuning metric.

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