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https://issues.apache.org/jira/browse/SOLR-2861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139264#comment-13139264
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Yonik Seeley commented on SOLR-2861:
------------------------------------
Here are some selected lines from fail4.xml, with comments:
{code}
316 TEST:WRITER7: adding id 30 val= 3 DONE
466 TEST:WRITER9: softCommit start
# Note: this is only the start of softCommit in the test... it's synchronized
in Solr so only one thread can reopen the
# reader and create a new searcher at a time.
3074 TEST:WRITER10: deleting id 30 val= 6 DONE
# At this point the delete command has returned (and in the test, we put -6 in
the model as the value)
3592 VERBOSE:WRITER9: TLOG: preSoftCommit: prevMap=1355224018 new map=10577597
# Note: actual reopen happens here, in a synchronized context.
3593 VERBOSE:WRITER9: added searcher Searcher@6460029d main to _searchers
reader version= 1319870174085
3673 VERBOSE:READER7: TLOG: lookup: for id 30 in prevMap 10577597 got null
lookupLog=/opt/code/lusolr/solr/build/solr-core/test/1/solrtest-TestRealTimeGet-1319870172806/tlog/tlog.0000000000000000002
3673 VERBOSE:READER7: RealTimeGet using searcher Searcher@6460029d main
3677 TEST:READER7: ERROR, id= 30 foundVal= 3 model val= -6 realTime= true
# We find the old value using the new searcher!
{code}
>From this, it doesn't look like it's the transaction log, or realtime-get.
We can see that the doc was deleted, a new searcher was opened, and then it was
used to do a lookup and got the old value.
Brainstorming:
- Bug in solr reopen code. This seems less likely since getSearcher() calls
that result in a reopen are synchronized from the outside... so races
shouldn't be possible there.
- Bug in lucene. This is looking more likely now, but I can't yet reproduce
it in a pure lucene test. It could be a reopen concurrency bug (like the last
were) or possibly a MultiFields & friends bug (see
SolrIndexSearcher/getFirstMatch used to do the lookup by id)
> transaction log / realtime-get failures
> ----------------------------------------
>
> Key: SOLR-2861
> URL: https://issues.apache.org/jira/browse/SOLR-2861
> Project: Solr
> Issue Type: Bug
> Reporter: Yonik Seeley
> Attachments: TEST-org.apache.solr.search.TestRealTimeGet.xml,
> fail4.xml, jenkins_output.txt, trunk-0.txt
>
>
> realtime-get or the transaction log fails sometimes
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