ChrisHegarty opened a new pull request, #15319:
URL: https://github.com/apache/lucene/pull/15319
Fixes a potential hang with initialisation of TermsEnum and BaseTermsEnum,
by simply removing the dependency and replicating the small amount of code.
Problem description: the static `TermsEnum.EMPTY` initialises to an
implementation of `BaseTermsEnum`. `TermsEnum` is a superclass of
`BaseTermsEnum`, so there is a clear dependency between these classes. If a
subclass of `BaseTermsEnum` is initialising it may grab the lock on
`BaseTermsEnum`, and prevent `TermsEnum` from initialising. E.g.
"main" #3 [8963] prio=5 os_prio=31 cpu=30.57ms elapsed=2.19s
tid=0x0000000123815a00 nid=8963 in Object.wait() [0x000000016b24e000]
java.lang.Thread.State: RUNNABLE
at TermsEnumClinitHang.main(TermsEnumClinitHang.java:22)
- waiting on the Class initialization monitor for
org.apache.lucene.index.TermsEnum
"TEST_THREAD" #25 [27395] prio=5 os_prio=31 cpu=1.54ms elapsed=2.17s
tid=0x000000012382e800 nid=27395 in Object.wait() [0x000000016d632000]
java.lang.Thread.State: RUNNABLE
at org.apache.lucene.index.TermsEnum.<clinit>(TermsEnum.java:199)
- waiting on the Class initialization monitor for
org.apache.lucene.index.BaseTermsEnum
at TermsEnumClinitHang$1.run(TermsEnumClinitHang.java:15)
...
fixes #15317
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