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https://issues.apache.org/jira/browse/LUCENE-10088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17411249#comment-17411249
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Michael McCandless commented on LUCENE-10088:
---------------------------------------------
Hmm, I instrumented {{MockDirectoryWrapper}} just a bit to print all {{close}}
after the {{too many open files}} exception. There are indeed many open files,
but curiously they are all {{.fdt}} and {{.fdx}} and {{temp}} files. They look
like this:
{noformat}
1> MDW.close: name=_2d1.fdm
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d1.fdt
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d1_Lucene90FieldsIndex-doc_ids_4q0.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d1_Lucene90FieldsIndexfile_pointers_4q1.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d2.fdm
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d2.fdt
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d2_Lucene90FieldsIndex-doc_ids_4q2.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d2_Lucene90FieldsIndexfile_pointers_4q3.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d3.fdm
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d3.fdt
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d3_Lucene90FieldsIndex-doc_ids_4q4.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d3_Lucene90FieldsIndexfile_pointers_4q5.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d4.fdm
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d4.fdt
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d4_Lucene90FieldsIndex-doc_ids_4q6.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy]
1> MDW.close: name=_2d4_Lucene90FieldsIndexfile_pointers_4q7.tmp
thread=Thread[Thread-3,5,TGRP-TestIndexWriterMergePolicy] {noformat}
In total there are 667 {{.fdt}} and {{.fdx}} still open, and 1334 temp files.
Maybe something about flushing/merging stored fields is leaking file handles?
> Too many open files in
> TestIndexWriterMergePolicy.testStressUpdateSameDocumentWithMergeOnGetReader
> --------------------------------------------------------------------------------------------------
>
> Key: LUCENE-10088
> URL: https://issues.apache.org/jira/browse/LUCENE-10088
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Priority: Major
>
> [This build
> failure|https://ci-builds.apache.org/job/Lucene/job/Lucene-NightlyTests-main/386/]
> reproduces for me. I'll try to dig.
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