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https://issues.apache.org/jira/browse/PHOENIX-4666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16592394#comment-16592394
]
Hadoop QA commented on PHOENIX-4666:
------------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12937079/298.patch
against master branch at commit 16c5570d38a3aa0527cbbdef21fd3859be4e729f.
ATTACHMENT ID: 12937079
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:green}+1 tests included{color}. The patch appears to include 3 new
or modified tests.
{color:green}+1 javac{color}. The applied patch does not increase the
total number of javac compiler warnings.
{color:red}-1 release audit{color}. The applied patch generated 2 release
audit warnings (more than the master's current 0 warnings).
{color:red}-1 lineLengths{color}. The patch introduces the following lines
longer than 100:
+ TestUtil.addCoprocessor(conn,
SchemaUtil.normalizeFullTableName(realName), InvalidateHashCache.class);
+ createTestTable(getUrl(), "CREATE TABLE IF NOT EXISTS states (state
CHAR(2) NOT NULL, name VARCHAR NOT NULL CONSTRAINT my_pk PRIMARY KEY (state,
name))");
+ createTestTable(getUrl(), "CREATE TABLE IF NOT EXISTS cities (state
CHAR(2) NOT NULL, city VARCHAR NOT NULL, population BIGINT CONSTRAINT my_pk
PRIMARY KEY (state, city))");
+ conn.prepareStatement("UPSERT INTO cities VALUES ('CA', 'San
Francisco', 50000)").executeUpdate();
+ conn.prepareStatement("UPSERT INTO cities VALUES ('CA', 'Sacramento',
3000)").executeUpdate();
+ ResultSet rs = conn.prepareStatement("SELECT SUM(population) FROM
states s JOIN cities c ON c.state = s.state").executeQuery();
+ rs = conn.prepareStatement("SELECT SUM(population) FROM states s JOIN
cities c ON c.state = s.state").executeQuery();
+ rs = conn.prepareStatement("SELECT /*+ USE_PERSISTENT_CACHE */
SUM(population) FROM states s JOIN cities c ON c.state =
s.state").executeQuery();
+ conn.prepareStatement("UPSERT INTO cities VALUES ('CA', 'Palo Alto',
2000)").executeUpdate();
+ rs = conn.prepareStatement("SELECT /*+ USE_PERSISTENT_CACHE */
SUM(population) FROM states s JOIN cities c ON c.state =
s.state").executeQuery();
{color:red}-1 core tests{color}. The patch failed these unit tests:
./phoenix-core/target/failsafe-reports/TEST-org.apache.phoenix.end2end.ConcurrentMutationsIT
Test results:
https://builds.apache.org/job/PreCommit-PHOENIX-Build/2006//testReport/
Release audit warnings:
https://builds.apache.org/job/PreCommit-PHOENIX-Build/2006//artifact/patchprocess/patchReleaseAuditWarnings.txt
Console output:
https://builds.apache.org/job/PreCommit-PHOENIX-Build/2006//console
This message is automatically generated.
> Add a subquery cache that persists beyond the life of a query
> -------------------------------------------------------------
>
> Key: PHOENIX-4666
> URL: https://issues.apache.org/jira/browse/PHOENIX-4666
> Project: Phoenix
> Issue Type: Improvement
> Reporter: Marcell Ortutay
> Assignee: Marcell Ortutay
> Priority: Major
> Attachments: 298.patch,
> PHOENIX-4666-subquery-cache-4.x-HBase-1.4.patch,
> PHOENIX-4666-subquery-cache-4.x-HBase-1.4.patch
>
>
> The user list thread for additional context is here:
> [https://lists.apache.org/thread.html/e62a6f5d79bdf7cd238ea79aed8886816d21224d12b0f1fe9b6bb075@%3Cuser.phoenix.apache.org%3E]
> ----
> A Phoenix query may contain expensive subqueries, and moreover those
> expensive subqueries may be used across multiple different queries. While
> whole result caching is possible at the application level, it is not possible
> to cache subresults in the application. This can cause bad performance for
> queries in which the subquery is the most expensive part of the query, and
> the application is powerless to do anything at the query level. It would be
> good if Phoenix provided a way to cache subquery results, as it would provide
> a significant performance gain.
> An illustrative example:
> SELECT * FROM table1 JOIN (SELECT id_1 FROM large_table WHERE x = 10)
> expensive_result ON table1.id_1 = expensive_result.id_2 AND table1.id_1 =
> \{id}
> In this case, the subquery "expensive_result" is expensive to compute, but it
> doesn't change between queries. The rest of the query does because of the
> \{id} parameter. This means the application can't cache it, but it would be
> good if there was a way to cache expensive_result.
> Note that there is currently a coprocessor based "server cache", but the data
> in this "cache" is not persisted across queries. It is deleted after a TTL
> expires (30sec by default), or when the query completes.
> This is issue is fairly high priority for us at 23andMe and we'd be happy to
> provide a patch with some guidance from Phoenix maintainers. We are currently
> putting together a design document for a solution, and we'll post it to this
> Jira ticket for review in a few days.
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