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From "Yi Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8794) Improve CorruptReplicasMap#corruptReplicasMap
Date Fri, 17 Jul 2015 22:46:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14632063#comment-14632063
] 

Yi Liu commented on HDFS-8794:
------------------------------

Thanks [~arpitagarwal] for review!

Actually I have added {{@VisibleForTesting}} annotation for {{getCorruptReplicaBlockIds}},
I can certainly rename it as you suggestion in next patch.

{quote}
It looks like {{getCorruptReplicaBlockIds}} won't work in general since it assumes the map
is sorted
{quote}
You are right,  I have fixed this too in the current patch, so no need additional fix, look
at following code, it uses a {{TreeMap}} wrapper in {{getCorruptReplicaBlockIds}}.  The Jenkins
result also shows the fix correct.
{code}
+    Iterator<Block> blockIt = 
+        new TreeMap<>(corruptReplicasMap).keySet().iterator();
{code}

> Improve CorruptReplicasMap#corruptReplicasMap
> ---------------------------------------------
>
>                 Key: HDFS-8794
>                 URL: https://issues.apache.org/jira/browse/HDFS-8794
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>         Attachments: HDFS-8794.001.patch
>
>
> Currently we use {{TreeMap}} for {{corruptReplicasMap}}, actually the only need sorted
place is {{getCorruptReplicaBlockIds}} which is used by test.
> So we can use {{HashMap}}.
> From memory and performance view, {{HashMap}} is better than {{TreeMap}}, a simliar optimization
HDFS-7433. Of course we need to make few change to {{getCorruptReplicaBlockIds}}.



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