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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17434) New Synchronization Scheme for Compaction Pipeline
Date Fri, 06 Jan 2017 19:30:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805399#comment-15805399
] 

Ted Yu commented on HBASE-17434:
--------------------------------

There is consensus (see HBASE-17379) of using copy on write for pipeline.
The first version, 17379.v8.txt, was posted on Dec 29, 2016.

In later reviews, CopyOnWriteArrayList was completely dropped and volatile array field is
adopted.

What's special which is offered by this JIRA ?

> New Synchronization Scheme for Compaction Pipeline
> --------------------------------------------------
>
>                 Key: HBASE-17434
>                 URL: https://issues.apache.org/jira/browse/HBASE-17434
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Eshcar Hillel
>         Attachments: HBASE-17434-V01.patch
>
>
> A new copyOnWrite synchronization scheme is introduced for the compaction pipeline.
> The new scheme is better since it removes the lock from getSegments() which is invoked
in every get and scan operation, and it reduces the number of LinkedList objects that are
created at runtime, thus can reduce GC (not by much, but still...).
> In addition, it fixes the method getTailSize() in compaction pipeline. This method creates
a MemstoreSize object which comprises the data size and the overhead size of the segment and
needs to be atomic.



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