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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10680) Deal with small compression chunk size better during streaming plan setup
Date Tue, 10 Nov 2015 06:26:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14998038#comment-14998038
] 

Yuki Morishita commented on CASSANDRA-10680:
--------------------------------------------

Patch here: https://github.com/yukim/cassandra/tree/10680

(tests are running.)

The patch creates chunks right before sending file instead of the time when adding SSTables
to stream.

> Deal with small compression chunk size better during streaming plan setup
> -------------------------------------------------------------------------
>
>                 Key: CASSANDRA-10680
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10680
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jeff Jirsa
>            Assignee: Yuki Morishita
>             Fix For: 2.1.x
>
>
> For clusters using small compression chunk size and terabytes of data, the streaming
plan calculations will instantiate hundreds of millions of compressionmetadata$chunk objects,
which will create unreasonable amounts of heap pressure. Rather than instantiating all of
those at once, streaming should instantiate only as many as needed for a single file per table
at a time.



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