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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-18019) Clear redundant memstore scanners
Date Wed, 17 May 2017 13:30:04 GMT

     [ https://issues.apache.org/jira/browse/HBASE-18019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chia-Ping Tsai updated HBASE-18019:
-----------------------------------
    Attachment: HBASE-18019.v1.patch

v1 --
# change the initial capacity of memStoreScannersAfterFlush from 2 to 3

> Clear redundant memstore scanners
> ---------------------------------
>
>                 Key: HBASE-18019
>                 URL: https://issues.apache.org/jira/browse/HBASE-18019
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18019.v0.patch, HBASE-18019.v1.patch
>
>
> The HBASE-17655 remove the MemStoreScanner and it causes that the MemStore#getScanner(readpt)
returns multi KeyValueScanner which consist of active, snapshot and pipeline. But StoreScanner
only remove one mem scanner when refreshing current scanners.
> {code}
>     for (int i = 0; i < currentScanners.size(); i++) {
>       if (!currentScanners.get(i).isFileScanner()) {
>         currentScanners.remove(i);
>         break;
>       }
>     }
> {code}
> The older scanners kept in the StoreScanner will hinder GC from releasing memory and
lead to multiple scans on the same data.
>  



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