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From "ASF subversion and git services (JIRA)" <>
Subject [jira] [Commented] (LUCENE-7595) RAMUsageTester in test-framework and static field checker no longer works with Java 9
Date Thu, 29 Dec 2016 01:12:58 GMT


ASF subversion and git services commented on LUCENE-7595:

Commit ea7db0a176979559e874b292522fa7006b578882 in lucene-solr's branch refs/heads/branch_6x
from [~thetaphi]
[;h=ea7db0a ]

LUCENE-7595: Improve RAMUsageTester in test-framework to estimate memory usage of runtime
classes and work with Java 9 EA (b148+). Disable static field heap usage checker in LuceneTestCase

> RAMUsageTester in test-framework and static field checker no longer works with Java 9
> -------------------------------------------------------------------------------------
>                 Key: LUCENE-7595
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: general/test
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>              Labels: Java9
>         Attachments: LUCENE-7595.patch
> Lucene/Solr tests have a special rule that records memory usage in static fields before
and after test, so we can detect memory leaks. This check dives into JDK classes (like java.lang.String
to detect their size). As Java 9 build 148 completely forbids setAccessible on any runtime
class, we have to change or disable this check:
> - As first step I will only add the rule to LTC, if we not have Java 8
> - As a second step we might investigate how to improve this
> [~rcmuir] had some ideas for the 2nd point:
> - Don't dive into classes from JDK modules and instead "estimate" the size for some special
cases (like Strings)
> - Disallow any static field in tests that is not final (constant) and points to an Object
except: Strings and native (wrapper) types.
> In addition we also have RAMUsageTester, that has similar problems and is used to compare
estimations of Lucene's calculations of Codec/IndexWriter/IndexReader memory usage with reality.
We should simply disable those tests.

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