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https://issues.apache.org/jira/browse/DRILL-4275?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15146865#comment-15146865
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ASF GitHub Bot commented on DRILL-4275:
---------------------------------------
Github user jacques-n commented on a diff in the pull request:
https://github.com/apache/drill/pull/374#discussion_r52855320
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZKClusterCoordinator.java
---
@@ -206,6 +205,16 @@ public DistributedSemaphore getSemaphore(String name,
int maximumLeases) {
return new ZkDistributedSemaphore(curator, "/semaphore/" + name,
maximumLeases);
}
+ @Override
+ public <V> TransientStore<V> newTransientStore(final
TransientStoreConfig<V> config) {
+ final ZkEphemeralStore<V> store = new ZkEphemeralStore<>(config,
curator);
--- End diff --
I think you need to cache these since each one will create a listener. This
used to be done by cachingstoreprovider but I don't think that is in the
Transient path anymore.
> Refactor e/pstore interfaces and their factories to provide a unified
> mechanism to access stores
> ------------------------------------------------------------------------------------------------
>
> Key: DRILL-4275
> URL: https://issues.apache.org/jira/browse/DRILL-4275
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Flow
> Reporter: Hanifi Gunes
> Assignee: Deneche A. Hakim
>
> We rely on E/PStore interfaces to persist data. Even though E/PStore stands
> for Ephemeral and Persistent stores respectively, the current design for
> EStore does not extend the interface/functionality of PStore at all, which
> hints abstraction for EStore is redundant. This issue proposes a new unified
> Store interface replacing the old E/PStore that exposes an additional method
> that report persistence level as follows:
> {code:title=Store interface}
> interface Store<V> {
> StoreMode getMode();
> V get(String key);
> ...
> }
> enum StoreMode {
> EPHEMERAL,
> PERSISTENT,
> ...
> }
> {code}
> The new design brings in less redundancy, more centralized code, ease to
> reason and maintain.
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