[SOLR-11261] Update to Hadoop 2.7.4 - ASF JIRA

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Details

Type: Improvement
Status: Closed
Priority: Blocker
Resolution: Fixed
Affects Version/s: 6.6
Fix Version/s: 6.6.1, 6.7, 7.0, 7.1, 8.0
Component/s: Hadoop Integration, hdfs
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Description

In ~~SOLR-10966~~ we added a "bad" workaround to prevent Hadoop's Shell class from breaking with Java 9 (StringIndexOutOfBoundsException). This was resolved in Hadoop 2.7.4, released a few weeks ago. We should revert the bad hack and update Hadoop.

After running tests, I see no issue with the bugfix relaese.

I will commit to master and 7.x and once it settled, I will backport. If we can't get this into 6.6.1, it's not so bad, but then we have to live with the "bad" hack there.