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From "jinglong.liujl (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3040) BlockIndex readIndex too slowly in heavy write scenario
Date Sun, 26 Sep 2010 04:20:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914914#action_12914914

jinglong.liujl commented on HBASE-3040:

We can reproduce this issue in our environment.
   Our environment is HBase 0.20.6 + Hadoop (CDH3b2).  5 region server and 5 datanode with
2193  region and  48.95 TB data in HDFS. And our client is put 5 column family and 5 qualifier
in one row, and commit  to HBase every 500 rows. We start 8 clients in one machine (have 6
machines, totally we have 48 clients, ). block size is 64K, region size is 256 M, one cell
has 100B random string. each machine has  8 core CPU, 48G memory,  12 1T disks.
   In region split , HMaster cosider the region has been load. But region server has not been
completed for loading.
    From client, it can not see the daughter region . After several retrys, exception will
be raised. exception like below
    org.apache.hadoop.hbase.client.NoServerForRegionException: No server address listed in
.META. for region 

> 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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