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https://issues.apache.org/jira/browse/HDFS-17811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18009496#comment-18009496
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ASF GitHub Bot commented on HDFS-17811:
---------------------------------------

hfutatzhanghb commented on PR #7820:
URL: https://github.com/apache/hadoop/pull/7820#issuecomment-3112609060

   Hi, @Hexiaoqiao @zhangshuyan0 @haiyang1987  Could you please help review 
this PR when you are free? Thanks very much!!!




> EC: DFSStripedInputStream supports retrying just like DFSInputStream
> --------------------------------------------------------------------
>
>                 Key: HDFS-17811
>                 URL: https://issues.apache.org/jira/browse/HDFS-17811
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ec, hdfs-client
>            Reporter: farmmamba
>            Assignee: farmmamba
>            Priority: Major
>              Labels: pull-request-available
>
> This is an very useful improvment for EC read.  It can reduce the the 
> frequency of read failures due to a rolling restart of the DataNodes.
> We have met below use case:
> {code:java}
> InputStream in = open();
> while (not reach EOF) {
>     in.read(buf, offset, len);
>     do some logic which is long time costed. 
> } {code}
> If we start rolling restart of the datanodes,  above case will finally fail 
> because all blockReaders may be marked as skip status by StripeReader. So, we 
> should make DFSStripedInputStream support retrying just like what 
> DFSInputStream does.



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