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From "Xiaobing Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9262) Reconfigure DN lazy writer interval on the fly
Date Fri, 04 Dec 2015 18:31:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15041927#comment-15041927
] 

Xiaobing Zhou commented on HDFS-9262:
-------------------------------------

I tried that but DataNode#data that is typeof interface FsDatasetSpi, which is agnostic of
any concrete type where I can put updateLazyWriterInterval. 

In  details, DataNode#data is initialized within DataNode#initStorage by calling FsDatasetFactory#newInstance

DataNode#initStorage
{code}
synchronized(this)  {
      if (data == null) {
        data = factory.newInstance(this, storage, conf);
      }
    }
{code}


{code}
public FsDatasetImpl newInstance(DataNode datanode,
      DataStorage storage, Configuration conf) throws IOException {
    return new FsDatasetImpl(datanode, storage, conf);
  }
{code}

Do you think it's good to keep current implementation or change FsDatasetSpi or write a new
interface to accommodate updateLazyWriterInterval? Thanks [~arpitagarwal]

> Reconfigure DN lazy writer interval on the fly
> ----------------------------------------------
>
>                 Key: HDFS-9262
>                 URL: https://issues.apache.org/jira/browse/HDFS-9262
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.7.0
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-9262.001.patch
>
>
> This is to reconfigure
> {code}
> dfs.datanode.lazywriter.interval.sec
> {code}
> without restarting DN.



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