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Posted to issues@hbase.apache.org by "Ted Yu (JIRA)" <ji...@apache.org> on 2012/12/01 02:33:58 UTC
[jira] [Commented] (HBASE-6580) New HTable pool, based on
HBase(byte[], HConnection, ExecutorService) constructor
[ https://issues.apache.org/jira/browse/HBASE-6580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507822#comment-13507822 ]
Ted Yu commented on HBASE-6580:
-------------------------------
For HConnection.java, please add javadoc for tableName parameter.
{code}
+ // thread executor shared by all HTableInterface instances created
+ // by this connection
{code}
nit: 'created by' -> 'created from'
{code}
+ } catch (InterruptedException e) {
+ this.hTableExecutor.shutdownNow();
+ }
{code}
Please restore interrupt status above.
{code}
+ if (hTableExecutor == null) {
+ // shared HTable thread executor not yet initialized
+ synchronized (this) {
+ if (hTableExecutor == null) {
{code}
Why use double checked locking ? Connection would be used to create (at least) one table, right ?
> New HTable pool, based on HBase(byte[], HConnection, ExecutorService) constructor
> ---------------------------------------------------------------------------------
>
> Key: HBASE-6580
> URL: https://issues.apache.org/jira/browse/HBASE-6580
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.92.2, 0.94.2
> Reporter: Lars Hofhansl
> Priority: Minor
> Attachments: HBASE-6580_v1.patch, HBASE-6580_v2.patch
>
>
> Here I propose a very simple TablePool.
> It could be called LightHTablePool (or something - if you have a better name).
> Internally it would maintain an HConnection and an Executor service and each invocation of getTable(...) would create a new HTable and close() would just close it.
> In testing I find this more light weight than HTablePool and easier to monitor in terms of resources used.
> It would hardly be more than a few dozen lines of code.
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