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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7859) Erasure Coding: Persist erasure coding policies in NameNode
Date Tue, 05 Sep 2017 02:33:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16153051#comment-16153051
] 

Kai Zheng commented on HDFS-7859:
---------------------------------

7. "HDFS-8140" should be HDFS-11467 instead, please update the comments.
{code}
+    @Override
+    protected void toXml(ContentHandler contentHandler) throws SAXException {
+      // TODO: HDFS-8140 Support for offline EditsVistor over an OEV XML file
+    }
+
+    @Override
+    void fromXml(Stanza st) throws InvalidXmlException {
+      // TODO: HDFS-8140 Support for offline EditsVistor over an OEV XML file
+    }
{code}

8. You have tests like {{testChangeErasureCodingCodec}}, {{AddNewErasureCodingCodec}} and
etc., but I don't think we need such as codec/coder/algorithms are part of the runtime binary
packages and are meant to be loaded during startup. Let's avoid the complexity here and focus
on the EC policy persisting stuff.

> Erasure Coding: Persist erasure coding policies in NameNode
> -----------------------------------------------------------
>
>                 Key: HDFS-7859
>                 URL: https://issues.apache.org/jira/browse/HDFS-7859
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: SammiChen
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HDFS-7859.001.patch, HDFS-7859.002.patch, HDFS-7859.004.patch, HDFS-7859.005.patch,
HDFS-7859.006.patch, HDFS-7859.007.patch, HDFS-7859.008.patch, HDFS-7859.009.patch, HDFS-7859.010.patch,
HDFS-7859.011.patch, HDFS-7859.012.patch, HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.002.patch,
HDFS-7859-HDFS-7285.003.patch
>
>
> In meetup discussion with [~zhz] and [~jingzhao], it's suggested that we persist EC schemas
in NameNode centrally and reliably, so that EC zones can reference them by name efficiently.



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