Mark Miller created SOLR-6089:
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Summary: When using the HDFS block cache, when a file is deleted,
it's underlying data entries in the block cache are not removed, which is a
problem with the global block cache option.
Key: SOLR-6089
URL: https://issues.apache.org/jira/browse/SOLR-6089
Project: Solr
Issue Type: Bug
Components: hdfs
Reporter: Mark Miller
Assignee: Mark Miller
Patrick Hunt noticed this. Without the global block cache, the block cache was
not reused after a directory was closed. Now that it is reused when using the
global cache, leaving the underlying entries presents a problem if that
directory is created again because blocks from the previous directory may be
read. This could happen when you remove a solrcore and recreate it with the
same data directory (or a collection with the same name). I could only
reproduce it easily using index merges (core admin) with the sequence: merge
index, delete collection, create collection, merge index. Reads on the final
merged index can look corrupt or queries may just return no results.
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