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https://issues.apache.org/jira/browse/PHOENIX-6387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17340448#comment-17340448
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ASF GitHub Bot commented on PHOENIX-6387:
-----------------------------------------
tkhurana commented on a change in pull request #1215:
URL: https://github.com/apache/phoenix/pull/1215#discussion_r627781707
##########
File path:
phoenix-core/src/main/java/org/apache/phoenix/hbase/index/IndexRegionObserver.java
##########
@@ -1165,4 +1356,255 @@ public static void enableIndexing(HTableDescriptor
desc, Class<? extends IndexBu
properties.put(IndexRegionObserver.INDEX_BUILDER_CONF_KEY,
builder.getName());
desc.addCoprocessor(IndexRegionObserver.class.getName(), null, priority,
properties);
}
-}
\ No newline at end of file
+
+ /**
+ * This function has been adapted from
PhoenixIndexBuilder#executeAtomicOp().
+ * The critical difference being that the code in
PhoenixIndexBuilder#executeAtomicOp()
+ * generates the mutations by reading the latest data table row from HBase
but in order
+ * to correctly support concurrent index mutations we need to always read
the latest
+ * data table row from memory.
+ * It takes in an atomic Put mutation and generates a list of Put and
Delete mutations.
+ * The list will be empty in the case of ON DUPLICATE KEY IGNORE and the
row already exists.
+ * In the case of ON DUPLICATE KEY UPDATE, we will generate one Put
mutation and optionally
Review comment:
It handles that case and generates delete mutations when column is set
null.
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> Conditional updates on tables with indexes
> ------------------------------------------
>
> Key: PHOENIX-6387
> URL: https://issues.apache.org/jira/browse/PHOENIX-6387
> Project: Phoenix
> Issue Type: Improvement
> Affects Versions: 5.0.0, 4.15.0
> Reporter: Kadir OZDEMIR
> Assignee: Tanuj Khurana
> Priority: Major
>
> For a row update done by using the UPSERT VALUES statement, the exact values
> of the columns to be updated are specified within the UPSERT statement.
> Regardless of whether a given row exists or not, after the update, we know
> what the content will be for these columns. However, this is not the case
> when the ON DUPLICATE KEY clause is added the UPSERT VALUES statement. This
> clause makes the update conditional and the end result is determined based on
> the conditions stated within the clause and the current state of the row at
> the time the update is done. Also, this clause makes the UPSERT VALUES
> statement atomic.
> Conditional updates are supported for the tables without indexes currently.
> The current design leverages an HBase atomic operation and cannot be expanded
> to support tables with indexes since the design requires holding (HBase
> level) row locks while doing index table updates over RPCs. This results in
> cluster wide deadlocks. This jira is to redesign conditional updates using
> Phoenix level row locks instead of using HBase level row locks to also
> support tables with indexes by leveraging the design of PHOENIX-6160 which
> simplifies the concurrent mutation handling on tables with indexes.
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