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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 03:43:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914907#action_12914907
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ryan rawson commented on HBASE-3040:
------------------------------------

Could you be more specific? Do you have some example code? Right now each
hfile's block index.is loaded (or attempted) using one load.
region server host), sequential put
column families
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
within one DFS read instead of 1000 reads.


> 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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