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Date: Fri, 8 Jan 2016 17:11:40 +0000 (UTC)
From: "Kihwal Lee (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12922878.1450393391000.59326.1452273100064@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-9574) Reduce client failures during
 datanode restart
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    [ https://issues.apache.org/jira/browse/HDFS-9574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15089536#comment-15089536 ] 

Kihwal Lee commented on HDFS-9574:
----------------------------------

bq. DFSInputStream: Instead of tracking the retryList separately, would it be easier to just add it back to the nodeList and set the isRetry boolean?
I thought about doing that. But with one list, it is hard to tell whether it has any good candidate left to try or it has only retriable nodes. The code ended up being more complicated than necessary so I settled with two separate lists.

bq. DataXceiver: Might consider changing checkAccess to not require the stream and just have it call getBufferedOutputStream.
It looks like that might be okay for the current usages. I didn't try to improve all inconsistencies in there. It might be better to be done in a separate clean-up jira.

> Reduce client failures during datanode restart
> ----------------------------------------------
>
>                 Key: HDFS-9574
>                 URL: https://issues.apache.org/jira/browse/HDFS-9574
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>         Attachments: HDFS-9574.patch, HDFS-9574.v2.patch, HDFS-9574.v3.patch
>
>
> Since DataXceiverServer is initialized before BP is fully up, client requests will fail until the datanode registers.


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