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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-1938) Make in-memory table scanning faster
Date Tue, 26 Jul 2011 21:12:12 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

nkeywal updated HBASE-1938:
---------------------------

    Attachment: 20110726_1938_MemStoreScanPerformance.java
                20110726_1938_MemStore.patch
                20110726_1938_KeyValueSkipListSet.patch

    20110726_1938_KeyValueSkipListSet.patch : Use the native ValueIterator instead of a wrapper
on EntryIterator, suppression an object creation for each call to the iterator.
    20110726_1938_MemStoreScanPerformance.java : Simple test case to measure scan performances
    20110726_1938_MemStore.patch : multiple small performance improvements on MemStoreScanner


> Make in-memory table scanning faster
> ------------------------------------
>
>                 Key: HBASE-1938
>                 URL: https://issues.apache.org/jira/browse/HBASE-1938
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance
>            Reporter: stack
>            Assignee: stack
>            Priority: Blocker
>         Attachments: 20110726_1938_KeyValueSkipListSet.patch, 20110726_1938_MemStore.patch,
20110726_1938_MemStoreScanPerformance.java, MemStoreScanPerformance.java, MemStoreScanPerformance.java,
caching-keylength-in-kv.patch, test.patch
>
>
> This issue is about profiling hbase to see if I can make hbase scans run faster when
all is up in memory.  Talking to some users, they are seeing about 1/4 million rows a second.
 It should be able to go faster than this (Scanning an array of objects, they can do about
4-5x this).

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