[ https://issues.apache.org/jira/browse/HDFS-5891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Haohui Mai updated HDFS-5891: ----------------------------- Attachment: HDFS-5891.000.patch > webhdfs should not try connecting the DN during redirection > ----------------------------------------------------------- > > Key: HDFS-5891 > URL: https://issues.apache.org/jira/browse/HDFS-5891 > Project: Hadoop HDFS > Issue Type: Bug > Reporter: Haohui Mai > Assignee: Haohui Mai > Attachments: HDFS-5891.000.patch > > > When the webhdfs server in NN serves an {{OPEN}} request, the NN will > eventually redirect the request to a DN. The current implementation intends > to choose the active DNs. The code always connects to the DN in a > deterministic order to see whether it is active during redirection. > Although it reduces the chance of the client from connecting to a failed DN, > this is problematic because: > # It has no guarantees that the client can connect to that DN even if the NN > can connect to it. > # It requires an additional network round-trip for every {{OPEN}} / > {{CREATE}} request. > This jira proposes that the NN should choose the DN based on the information > of the data node manager. -- This message was sent by Atlassian JIRA (v6.1.5#6160)