HIVE-29291: Use minHistoryWriteId by default #6154
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deniskuzZ
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Oct 27, 2025
| } | ||
| }); | ||
|
|
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| Long minTxnId = jdbcResource.execute(new MinUncommittedTxnIdHandler()); |
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existing MinUncommittedTxnIdHandler wasn't used for unknown reason
deniskuzZ
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Oct 27, 2025
| if (txnType == TxnType.SOFT_DELETE || txnType == TxnType.COMPACTION) { | ||
| new AcquireTxnLockFunction(false).execute(jdbcResource); | ||
| if (!ConfVars.useMinHistoryWriteId()) { | ||
| new AcquireTxnLockFunction(false).execute(jdbcResource); |
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nextTxnId hwm is not used with MinHistoryWriteId, so no need to lock in oder to get accurate value
deniskuzZ
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Oct 27, 2025
| "FROM \"TXN_COMPONENTS\" WHERE \"TC_TXNID\"= :txnId AND \"TC_OPERATION_TYPE\" <> :type"), | ||
| writeSetInsertSql + (ConfVars.useMinHistoryLevel() ? conflictSQLSuffix : | ||
| "FROM \"TXN_COMPONENTS\" WHERE \"TC_TXNID\"= :txnId" + ( | ||
| (txnType != TxnType.REBALANCE_COMPACTION) ? "" : " AND \"TC_OPERATION_TYPE\" <> :type")), |
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REBALANCE_COMPACTION uses UPDATE operation semantic with EXCL_WRITE
deniskuzZ
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Oct 27, 2025
| queryBatch.add("DELETE FROM \"MATERIALIZATION_REBUILD_LOCKS\" WHERE \"MRL_TXN_ID\" = " + txnid); | ||
| } | ||
| if (txnType == TxnType.SOFT_DELETE || txnType == TxnType.COMPACTION) { | ||
| if (txnType == TxnType.SOFT_DELETE || MetaStoreServerUtils.isCompactionTxn(txnType)) { |
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no idea why REBALANCE_COMPACTION was excluded, looks like a bug
deniskuzZ
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Oct 27, 2025
| " \"CUR\".\"TC_PARTITION\" IS NULL) " + | ||
| // txns overlap | ||
| " WHERE \"CUR\".\"TC_TXNID\" <= \"COMMITTED\".\"WS_COMMIT_ID\""; | ||
| " WHERE \"CUR\".\"TC_TXNID\" <= \"COMMITTED\".\"WS_COMMIT_ID\"" + |
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just moved the predicate under the WHERE clause
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...ver/src/main/java/org/apache/hadoop/hive/metastore/txn/jdbc/functions/CommitTxnFunction.java
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What changes were proposed in this pull request?
Use minHistoryWriteId by default
Why are the changes needed?
Overcomes scalability constraints imposed by global min open txn concept
Does this PR introduce any user-facing change?
No
How was this patch tested?
Jenkins