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From "Andrey Stepachev (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12203) Remove Master from table status query path.
Date Wed, 08 Oct 2014 15:31:34 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrey Stepachev updated HBASE-12203:
-------------------------------------
    Description: 
With patch HBASE-7767 we moved table statuses from ZK to HDFS. That was a good cleanup, but
we put additional (substantial) load on master. Some client requests use checks for table
state (for example HBASE-12035). 
Thats is why patch was not back ported to branch1 (HBASE-11978)

Lets replicate state back to zk, but as a mirror of table states.

What can be done:
1. TableStateManager would push table state changes to zk
2. Return back ZKTableStateClientSideReader.

Alternative way:
1. Move table statuses to separate table like namespaces
2. Issue statuses requests against this table

  was:
With patch HBASE-7767 we moved table statuses from ZK to HDFS. That was a good cleanup, but
we put additional (substantial) load on master. Some client requests use checks for table
state (for example HBASE-12035). 
Thats is why patch was not back ported to branch1 (HBASE-11978)

Lets replicate state back to zk, but as a mirror of table states.

What can be done:
1. TableStateManager would push table state changes to zk
2. Return back ZKTableStateClientSideReader.


> Remove Master from table status query path.
> -------------------------------------------
>
>                 Key: HBASE-12203
>                 URL: https://issues.apache.org/jira/browse/HBASE-12203
>             Project: HBase
>          Issue Type: Improvement
>          Components: Client, master
>    Affects Versions: 2.0.0
>            Reporter: Andrey Stepachev
>            Priority: Minor
>             Fix For: 1.0.0, 2.0.0
>
>
> With patch HBASE-7767 we moved table statuses from ZK to HDFS. That was a good cleanup,
but we put additional (substantial) load on master. Some client requests use checks for table
state (for example HBASE-12035). 
> Thats is why patch was not back ported to branch1 (HBASE-11978)
> Lets replicate state back to zk, but as a mirror of table states.
> What can be done:
> 1. TableStateManager would push table state changes to zk
> 2. Return back ZKTableStateClientSideReader.
> Alternative way:
> 1. Move table statuses to separate table like namespaces
> 2. Issue statuses requests against this table



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