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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14556) Optimize streaming path in Cassandra
Date Fri, 13 Jul 2018 19:02:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16543602#comment-16543602
] 

ASF GitHub Bot commented on CASSANDRA-14556:
--------------------------------------------

Github user aweisberg commented on the issue:

    https://github.com/apache/cassandra/pull/239
  
    The dtest doesn't validate that the kind of streaming you wanted to occur occured just
that streaming succeeded.
    
    I would also like to see it validate that if you run leveled compaction it will tend stream
whole tables from the deeper levels which is one of the success criteria.
    
    It would also be good to see that it works with CASSANDRA-6696 and size tiered and ends
up streaming whole sstables.


> Optimize streaming path in Cassandra
> ------------------------------------
>
>                 Key: CASSANDRA-14556
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14556
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Streaming and Messaging
>            Reporter: Dinesh Joshi
>            Assignee: Dinesh Joshi
>            Priority: Major
>              Labels: Performance
>             Fix For: 4.x
>
>
> During streaming, Cassandra reifies the sstables into objects. This creates unnecessary
garbage and slows down the whole streaming process as some sstables can be transferred as
a whole file rather than individual partitions. The objective of the ticket is to detect when
a whole sstable can be transferred and skip the object reification. We can also use a zero-copy
path to avoid bringing data into user-space on both sending and receiving side.



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