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https://issues.apache.org/jira/browse/PHOENIX-438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabriel Reid resolved PHOENIX-438.
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Resolution: Fixed
Bulk resolve of closed issues imported from GitHub. This status was reached by
first re-opening all closed imported issues and then resolving them in bulk.
> Adding a basic column-covered index implementation to hbase-index
> -----------------------------------------------------------------
>
> Key: PHOENIX-438
> URL: https://issues.apache.org/jira/browse/PHOENIX-438
> Project: Phoenix
> Issue Type: Task
> Reporter: Jason Yates
>
> This is a Indexer that demonstrates how one might build
> a covered index. In this case, we cover only the specified
> columns and ignore the rest of the columns in the row.
> The implementation has three main parts: the specifier, the
> codec, and the indexer. The specifier is a helper to correctly
> configure the columns that you want to index. The codec does the
> work of transforming to/from index entries. It also supports
> manipulation of the backing data so you can apply a delete/put
> (or a subset of their kvs) to the row and then build the new index entry.
> Finally, the indexer manages getting the local row, batching entries
> based on their timestamp (one of the tricker pieces as a put/delete
> can have KVs that all correspond to different timestamps).
> Also, this commit fixes a small bug in the Indexer.
> Previously, when we attempt to make an index update, but there are no
> resulting updates
> (i.e. delete of an empty row) we early out in doPre which skips taking the
> update lock
> since we don't need to lock rolling of the WAL if there are no index updates
> to write.
> However, we still release the lock in doPost, even if no index updates had
> been made.
> Therefore, we end up getting an IllegalMonitorException since that lock is
> unheld.
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