kasakrisz commented on a change in pull request #2088:
URL: https://github.com/apache/hive/pull/2088#discussion_r598594760
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/txn/TxnHandler.java
##########
@@ -2364,91 +2364,129 @@ public Materialization
getMaterializationInvalidationInfo(
// We are composing a query that returns a single row if an update
happened after
// the materialization was created. Otherwise, query returns 0 rows.
+
+ // Parse validReaderWriteIdList from creation metadata
+ final ValidTxnWriteIdList validReaderWriteIdList =
+ new ValidTxnWriteIdList(creationMetadata.getValidTxnList());
+
+ // Parse validTxnList
+ final ValidReadTxnList currentValidTxnList = new
ValidReadTxnList(validTxnListStr);
+ // Get the valid write id list for the tables in current state
+ final List<TableValidWriteIds> currentTblValidWriteIdsList = new
ArrayList<>();
+ Connection dbConn = null;
+ for (String fullTableName : creationMetadata.getTablesUsed()) {
+ try {
+ dbConn = getDbConn(Connection.TRANSACTION_READ_COMMITTED);
+ currentTblValidWriteIdsList.add(getValidWriteIdsForTable(dbConn,
fullTableName, currentValidTxnList));
+ } catch (SQLException ex) {
+ String errorMsg = "Unable to query Valid writeIds of table " +
fullTableName;
+ LOG.warn(errorMsg, ex);
+ throw new MetaException(errorMsg + " " +
StringUtils.stringifyException(ex));
+ } finally {
+ closeDbConn(dbConn);
+ }
+ }
+ final ValidTxnWriteIdList currentValidReaderWriteIdList =
TxnCommonUtils.createValidTxnWriteIdList(
+ currentValidTxnList.getHighWatermark(),
currentTblValidWriteIdsList);
+
+ List<String> params = new ArrayList<>();
+ StringBuilder queryUpdateDelete = new StringBuilder();
+ StringBuilder queryCompletedCompactions = new StringBuilder();
+ StringBuilder queryCompactionQueue = new StringBuilder();
+ // compose a query that select transactions containing an update...
+ queryUpdateDelete.append("SELECT \"CTC_UPDATE_DELETE\" FROM
\"COMPLETED_TXN_COMPONENTS\" WHERE \"CTC_UPDATE_DELETE\" ='Y' AND (");
+ queryCompletedCompactions.append("SELECT 1 FROM \"COMPLETED_COMPACTIONS\"
WHERE (");
+ queryCompactionQueue.append("SELECT 1 FROM \"COMPACTION_QUEUE\" WHERE (");
+ int i = 0;
+ for (String fullyQualifiedName : creationMetadata.getTablesUsed()) {
+ ValidWriteIdList tblValidWriteIdList =
+
validReaderWriteIdList.getTableValidWriteIdList(fullyQualifiedName);
+ if (tblValidWriteIdList == null) {
+ LOG.warn("ValidWriteIdList for table {} not present in creation
metadata, this should not happen", fullyQualifiedName);
+ return null;
+ }
+
+ // First, we check whether the low watermark has moved for any of the
tables.
+ // If it has, we return true, since it is not incrementally refreshable,
e.g.,
+ // one of the commits that are not available may be an update/delete.
+ ValidWriteIdList currentTblValidWriteIdList =
+
currentValidReaderWriteIdList.getTableValidWriteIdList(fullyQualifiedName);
+ if (currentTblValidWriteIdList == null) {
+ LOG.warn("Current ValidWriteIdList for table {} not present in
creation metadata, this should not happen", fullyQualifiedName);
+ return null;
+ }
+ if (!Objects.equals(currentTblValidWriteIdList.getMinOpenWriteId(),
tblValidWriteIdList.getMinOpenWriteId())) {
+ LOG.debug("Minimum open write id do not match for table {}",
fullyQualifiedName);
+ return null;
+ }
+
+ // ...for each of the tables that are part of the materialized view,
+ // where the transaction had to be committed after the materialization
was created...
+ if (i != 0) {
+ queryUpdateDelete.append("OR");
+ queryCompletedCompactions.append("OR");
+ queryCompactionQueue.append("OR");
+ }
+ String[] names = TxnUtils.getDbTableName(fullyQualifiedName);
+ assert (names.length == 2);
+ queryUpdateDelete.append(" (\"CTC_DATABASE\"=? AND \"CTC_TABLE\"=?");
+ queryCompletedCompactions.append(" (\"CC_DATABASE\"=? AND
\"CC_TABLE\"=?");
+ queryCompactionQueue.append(" (\"CQ_DATABASE\"=? AND \"CQ_TABLE\"=?");
+ params.add(names[0]);
+ params.add(names[1]);
+ queryUpdateDelete.append(" AND (\"CTC_WRITEID\" > " +
tblValidWriteIdList.getHighWatermark());
+ queryCompletedCompactions.append(" AND (\"CC_HIGHEST_WRITE_ID\" > " +
tblValidWriteIdList.getHighWatermark());
+ queryUpdateDelete.append(tblValidWriteIdList.getInvalidWriteIds().length
== 0 ? ") " :
+ " OR \"CTC_WRITEID\" IN(" + StringUtils.join(",",
Review comment:
Thanks for point out this.
This can fail on Oracle if an MV source table is affected by more than 1000
open/aborted transaction when the MV was created
(`tblValidWriteIdList.getInvalidWriteIds()`) or being rebuild
(`currentValidTxnList.getInvalidTransactions()`).
Also found this pattern elsewhere:
https://github.com/apache/hive/blob/c8d9d2c3b0bcf871145f49185344935b0c23da0e/ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/CompactionQueryBuilder.java#L357
A possible solution could be to split the list of invalid transaction ids to
smaller lists
a) and run the assembled query with each sublist
or
b) assemble a query like:
```
SELECT CTC_UPDATE_DELETE FROM COMPLETED_TXN_COMPONENTS
WHERE
...
CTC_WRITEID > ? OR (
CTC_WRITEID IN (<sublist1>) OR
CTC_WRITEID IN (<sublist2>) OR
...
CTC_WRITEID IN (<sublistn>)
...
```
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