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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16229) Cleaning up size and heapSize calculation
Date Tue, 30 Aug 2016 08:55:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15448486#comment-15448486
] 

Anastasia Braginsky commented on HBASE-16229:
---------------------------------------------

The test case correction -- tell me about it!!! Indeed a big head ache! This is where I stopped
dealing with it in 14921 :-) 

BTW, I left you some comments in the review board of the previous patch (before the last patch
was published). Did you have a chance to look on them?

> Cleaning up size and heapSize calculation
> -----------------------------------------
>
>                 Key: HBASE-16229
>                 URL: https://issues.apache.org/jira/browse/HBASE-16229
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 2.0.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16229.patch, HBASE-16229_V2.patch, HBASE-16229_V3.patch, HBASE-16229_V4.patch
>
>
> It is bit ugly now. For eg:
> AbstractMemStore
> {code}
> public final static long FIXED_OVERHEAD = ClassSize.align(
>       ClassSize.OBJECT +
>           (4 * ClassSize.REFERENCE) +
>           (2 * Bytes.SIZEOF_LONG));
>   public final static long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
>       (ClassSize.ATOMIC_LONG + ClassSize.TIMERANGE_TRACKER +
>       ClassSize.CELL_SKIPLIST_SET + ClassSize.CONCURRENT_SKIPLISTMAP));
> {code}
> We include the heap overhead of Segment also here. It will be better the Segment contains
its overhead part and the Memstore impl uses the heap size of all of its segments to calculate
its size.
> Also this
> {code}
> public long heapSize() {
>     return getActive().getSize();
>   }
> {code}
> HeapSize to consider all segment's size not just active's. I am not able to see an override
method in CompactingMemstore.
> This jira tries to solve some of these.
> When we create a Segment, we seems pass some initial heap size value to it. Why?  The
segment object internally has to know what is its heap size not like some one else dictate
it.
> More to add when doing this cleanup



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