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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3040) BlockIndex readIndex too slowly in heavy write scenario
Date Sun, 26 Sep 2010 06:26:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914928#action_12914928
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ryan rawson commented on HBASE-3040:
------------------------------------

This looks similar to a different perf bug, perhaps you could try a
fix by using a BufferedInputStream to wrap the other stream and see
what happens?  This fixed the issue the other time :-)





> BlockIndex readIndex too slowly in heavy write scenario
> -------------------------------------------------------
>
>                 Key: HBASE-3040
>                 URL: https://issues.apache.org/jira/browse/HBASE-3040
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.20.6
>         Environment: 1master, 7 region servers, 4 * 7 clients(all clients run on region
server host),  sequential put
>            Reporter: andychen
>
> region size is configured with 128M,  block size is 64K, the table has 5 column families
> at the beginning, when region split, master assigns daughters to new region servers,
new region server open region, readIndex of this region's storefile(about 1000 blocks) spent
30~50ms, with the data import region server spent more and more time (sometimes up to several
seconds) to load 1000 block indices
> at right now, we resolve this issue by getting all indices of one hfile within one DFS
read instead of 1000 reads.
> is there any other better resolution?

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