Indexer hangs after IndexDatabase.optimize: done

[pbozhkov]

Describe the bug
Indexer hangs. It stayed two days, and the last entry in the log is
INFO IndexDatabase.optimize: done

This happens only on one container, the other container with smaller /src is indexing, and in the log we have:

2020-03-12 12:25:23.834+0000 INFO t1312 IndexDatabase.optimize: done
2020-03-12 12:25:23.957+0000 INFO t1 Statistics.report: Done indexing data of all repositories (took 0:37:39)
2020-03-12 12:25:23.957+0000 INFO t1 Indexer.sendToConfigHost: Sending configuration to: localhost:2424
2020-03-12 12:25:26.301+0000 INFO t1 Indexer.sendToConfigHost: Configuration update routine done, check log output for errors.
2020-03-12 12:25:26.301+0000 INFO t1 Statistics.report: Total time: 1:03:41
2020-03-12 12:25:26.447+0000 INFO t1 Statistics.report: Final Memory: 82M/529M

Both containers are the same:
Apache Tomcat 8.5.41
OpenGrok 1.0.13
openjdk 1.8.0_212

Containers are running on:
OS CentOS 7.7
Docker version 19.03.7

To Reproduce
I've started the container again, and it hangs after the same log entry.

[vladak]

1.0 is pretty old. Could you try with the latest version first ?

[pbozhkov]

It appears that a 35M file:
$ file LargeFile.tcml:
$ LargeFile.tcml: XML 1.0 document, ASCII text, with very long lines
caused the indexing hang issue
From the logs:
after IndexDatabase.optimize: done
before Statistics.report: Done indexing data of all repositories
for this very old OpenGrok version (1.0)

I didn't test it with the latest versions yet.
Thank you.