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From "BELUGA BEHR (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16758) Better Select Number of Replications
Date Mon, 07 Aug 2017 01:22:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

BELUGA BEHR updated HIVE-16758:
-------------------------------
    Attachment: HIVE-16758.3.patch
                HIVE-16758.2.patch

> Better Select Number of Replications
> ------------------------------------
>
>                 Key: HIVE-16758
>                 URL: https://issues.apache.org/jira/browse/HIVE-16758
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: BELUGA BEHR
>            Assignee: BELUGA BEHR
>            Priority: Minor
>         Attachments: HIVE-16758.1.patch, HIVE-16758.2.patch, HIVE-16758.3.patch
>
>
> {{org.apache.hadoop.hive.ql.exec.SparkHashTableSinkOperator.java}}
> We should be smarter about how we pick a replication number.  We should add a new configuration
equivalent to {{mapreduce.client.submit.file.replication}}.  This value should be around the
square root of the number of nodes and not hard-coded in the code.
> {code}
> public static final String DFS_REPLICATION_MAX = "dfs.replication.max";
> private int minReplication = 10;
>   @Override
>   protected void initializeOp(Configuration hconf) throws HiveException {
> ...
>     int dfsMaxReplication = hconf.getInt(DFS_REPLICATION_MAX, minReplication);
>     // minReplication value should not cross the value of dfs.replication.max
>     minReplication = Math.min(minReplication, dfsMaxReplication);
>   }
> {code}
> https://hadoop.apache.org/docs/r2.7.2/hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml



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