hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9736) Alow more than one log splitter per RS
Date Fri, 18 Oct 2013 22:11:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799580#comment-13799580

stack commented on HBASE-9736:

It seems hard-baked-in that we do one task/split per RS.  Tasks for a full WAL run about 30-60
seconds.  Doing three splits per server in // could impinge on a serving RS but would cut
down the WAL split component of MTTR, the longest pole.

> Alow more than one log splitter per RS
> --------------------------------------
>                 Key: HBASE-9736
>                 URL: https://issues.apache.org/jira/browse/HBASE-9736
>             Project: HBase
>          Issue Type: Improvement
>          Components: MTTR
>            Reporter: stack
>            Priority: Critical
> IIRC, this is an idea that came from the lads at Xiaomi.
> I have a small cluster of 6 RSs and one went down.  It had a few WALs.  I see this in
> 2013-10-09 05:47:27,890 DEBUG org.apache.hadoop.hbase.master.SplitLogManager: total tasks
= 25 unassigned = 21
> WAL splitting is held up for want of slots out on the cluster to split WALs.
> We need to be careful we don't overwhelm the foreground regionservers but more splitters
should help get all back online faster.

This message was sent by Atlassian JIRA

View raw message