klcopp commented on a change in pull request #2073:
URL: https://github.com/apache/hive/pull/2073#discussion_r605790475
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/TxnHandler.java
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@@ -3646,6 +3649,86 @@ public ShowCompactResponse
showCompact(ShowCompactRequest rqst) throws MetaExcep
}
}
+ /**
+ * We assume this is only called by metadata cache server to know if there
are new base/delta files should be read.
+ * The query filters compactions by state and only returns SUCCEEDED or
READY_FOR_CLEANING compactions because
+ * only these two states means there are new files ready to be read.
+ */
+ @RetrySemantics.ReadOnly
+ public GetLatestCompactionInfoResponse
getLatestCompactionInfo(GetLatestCompactionInfoRequest rqst)
+ throws MetaException {
+ GetLatestCompactionInfoResponse response = new
GetLatestCompactionInfoResponse(new ArrayList<>());
+ Connection dbConn = null;
+ PreparedStatement pst = null;
+ ResultSet rs = null;
+ try {
+ try {
+ dbConn = getDbConn(Connection.TRANSACTION_READ_COMMITTED);
+
+ List<String> params = new ArrayList<>();
+ // This query combines the result sets of SUCCEEDED compactions and
READY_FOR_CLEANING compactions
+ // We also sort the result by CC_ID in descending order so that we can
keep only the latest record
+ // according to the order in result set
+ StringBuilder sb = new StringBuilder()
+ .append("SELECT * FROM (")
Review comment:
No, never mind then
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