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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4805) Allow better control of resource consumption in HTable
Date Thu, 17 Nov 2011 04:06:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13151778#comment-13151778
] 

stack commented on HBASE-4805:
------------------------------

I prefer the previous formatting (for the next time):

{code}
-  public HTable(Configuration conf, final String tableName)
-  throws IOException {
+  public HTable(Configuration conf, final String tableName) throws IOException {
     this(conf, Bytes.toBytes(tableName));
{code}

(and its < 80 chars on a line).

Nice javadoc on the HTable constructor.

Don't you need to javadoc that conf has to be null if you pass a connection and pool else
they'll not be used?

Hmmm... maybe its better to not take a conf at all?  Else it could get confusing.  Say you'll
use the configuration that is in the passed HConnection?  Looking at the way this new constructor
runs, I could really mess w/ you passing null Configuration and null Connection.  More checks
I'd say.

Else patch looks good to me and +1 on getting it into 0.92.



                
> Allow better control of resource consumption in HTable
> ------------------------------------------------------
>
>                 Key: HBASE-4805
>                 URL: https://issues.apache.org/jira/browse/HBASE-4805
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.92.0, 0.94.0
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>
>         Attachments: 4805.txt
>
>
> From some internal discussions at Salesforce we concluded that we need better control
over the resources (mostly threads) consumed by HTable when used in a AppServer with many
client threads.
> Since HTable is not thread safe, the only options are cache them (in a custom thread
local or using HTablePool) or to create them on-demand.
> I propose a simple change: Add a new constructor to HTable that takes an optional ExecutorService
and HConnection instance. That would make HTable a pretty lightweight object and we would
manage the ES and HC separately.
> I'll upload a patch a soon to get some feedback.

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