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From "Fengnan Li (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-15196) RBF: RouterRpcServer getListing cannot list large dirs correctly
Date Fri, 28 Feb 2020 19:41:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-15196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047899#comment-17047899

Fengnan Li commented on HDFS-15196:

Fix checkstyle in [^HDFS-15196.003.patch]

> RBF: RouterRpcServer getListing cannot list large dirs correctly
> ----------------------------------------------------------------
>                 Key: HDFS-15196
>                 URL: https://issues.apache.org/jira/browse/HDFS-15196
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Fengnan Li
>            Assignee: Fengnan Li
>            Priority: Critical
>         Attachments: HDFS-15196.001.patch, HDFS-15196.002.patch, HDFS-15196.003.patch
> In RouterRpcServer, getListing function is handled as two parts:
>  # Union all partial listings from destination ns + paths
>  # Append mount points for the dir to be listed
> In the case of large dir which is bigger than DFSConfigKeys.DFS_LIST_LIMIT (with default
value 1k), the batch listing will be used and the startAfter will be used to define the boundary
of each batch listing. However, step 2 here will add existing mount points, which will mess
up with the boundary of the batch, thus making the next batch startAfter wrong.
> The fix is just to append the mount points when there is no more batch query necessary.

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