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Posted to reviews@spark.apache.org by "liviazhu (via GitHub)" <gi...@apache.org> on 2026/02/11 23:15:17 UTC
[PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint directory in StateDataSource [spark]
liviazhu opened a new pull request, #54277:
URL: https://github.com/apache/spark/pull/54277
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Previously, we try to create a new directory for offsets, commits, and state in the checkpoint directory if they don't exist when running `StateDataSource`. This is because the utility functions are shared with streaming query functionality which needs to create these dirs if they don't exist. This change creates new readOnly modes for the utilities so that datasources do not need to mkdirs.
- **StreamingQueryCheckpointMetadata** – New `readOnly` parameter; when true, passed to `OffsetSeqLog` and `CommitLog`.
- **HDFSMetadataLog** – New `readOnly` parameter. Directory creation is skipped when `readOnly=true` unless `streamingCheckpointCreateDirOnRead` is true. Comment added: create dir only when it’s not a read-only log or createDirOnRead is true, and the metadata path does not exist.
- **CommitLog, OffsetSeqLog** – Accept and forward `readOnly` to `HDFSMetadataLog`.
New configurations
- **`spark.sql.streaming.checkpoint.stateCreateMetadataDirOnRead`** (default: false) – When true, the state data source reader may create metadata dirs if missing; when false, it only reads existing dirs.
- **`spark.sql.streaming.checkpoint.createDirOnRead`** (default: false) – When true, offset/commit log initialization may create the parent directory if missing.
### Why are the changes needed?
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1. If you propose a new API, clarify the use case for a new API.
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Allow usage of StateDataSource on checkpoints that are read-only.
### Does this PR introduce _any_ user-facing change?
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No
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New unit tests
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db closed pull request #54277: [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource
URL: https://github.com/apache/spark/pull/54277
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "liviazhu (via GitHub)" <gi...@apache.org>.
liviazhu commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829561068
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/checkpointing/CommitLog.scala:
##########
@@ -46,8 +46,11 @@ import org.apache.spark.sql.internal.SQLConf
* line 1: version
* line 2: metadata (optional json string)
*/
-class CommitLog(sparkSession: SparkSession, path: String)
- extends HDFSMetadataLog[CommitMetadata](sparkSession, path) {
+class CommitLog(
+ sparkSession: SparkSession,
+ path: String,
+ readOnly: Boolean = false)
Review Comment:
Done
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint directory in StateDataSource [spark]
Posted by "liviazhu (via GitHub)" <gi...@apache.org>.
liviazhu commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829551241
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
##########
@@ -2584,6 +2584,26 @@ object SQLConf {
.createWithDefault(
"org.apache.spark.sql.execution.streaming.state.HDFSBackedStateStoreProvider")
+ val STREAMING_CHECKPOINT_STATE_CREATE_METADATA_DIR_ON_READ =
+ buildConf("spark.sql.streaming.checkpoint.stateCreateMetadataDirOnRead")
Review Comment:
As a safeguard, but I can remove it.
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829721277
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateSchemaCompatibilityChecker.scala:
##########
@@ -96,7 +97,9 @@ class StateSchemaCompatibilityChecker(
private val fm = CheckpointFileManager.create(schemaFileLocation, hadoopConf)
- fm.mkdirs(schemaFileLocation.getParent)
+ if (createSchemaDir && !fm.exists(schemaFileLocation.getParent)) {
+ fm.mkdirs(schemaFileLocation.getParent)
Review Comment:
same here - lets add a log in the else case
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829719614
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -352,7 +357,7 @@ class OperatorStateMetadataV2Reader(
// List the available batches in the operator metadata directory
private def listOperatorMetadataBatches(): Array[Long] = {
- if (!fm.exists(metadataDirPath)) {
+ if (!fm.exists(metadataDirPath.getParent) || !fm.exists(metadataDirPath)) {
Review Comment:
Why do we need to do this ?
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "liviazhu (via GitHub)" <gi...@apache.org>.
liviazhu commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829817855
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -331,7 +334,11 @@ class OperatorStateMetadataV2Reader(
private val metadataDirPath = OperatorStateMetadataV2.metadataDirPath(stateCheckpointPath)
private lazy val fm = CheckpointFileManager.create(metadataDirPath, hadoopConf)
- fm.mkdirs(metadataDirPath.getParent)
+ if (createMetadataDir && !fm.exists(metadataDirPath.getParent)) {
+ fm.mkdirs(metadataDirPath.getParent)
+ } else if (!createMetadataDir) {
+ logInfo(log"Skipping metadata directory creation (createMetadataDir=false)")
Review Comment:
Done, added checkpointlocation to log
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829722843
##########
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/v2/state/StateDataSourceReadSuite.scala:
##########
@@ -1501,3 +1502,169 @@ abstract class StateDataSourceReadSuite extends StateDataSourceTestBase with Ass
}
}
}
+
+/**
+ * Test suite that verifies the state data source reader does not create empty state
+ * directories when reading state for all stateful operators.
+ *
+ * The reader does not create metadata directories (no mkdirs on the schema metadata path).
+ * This is important for
+ * Unity Catalog environments where creating directories requires WRITE FILES permission,
Review Comment:
nit: lets remove this line the comment
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829769229
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -352,7 +357,7 @@ class OperatorStateMetadataV2Reader(
// List the available batches in the operator metadata directory
private def listOperatorMetadataBatches(): Array[Long] = {
- if (!fm.exists(metadataDirPath)) {
+ if (!fm.exists(metadataDirPath.getParent) || !fm.exists(metadataDirPath)) {
Review Comment:
ok - can we add a code comment for this then ? thanks
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2823853945
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
##########
@@ -2584,6 +2584,26 @@ object SQLConf {
.createWithDefault(
"org.apache.spark.sql.execution.streaming.state.HDFSBackedStateStoreProvider")
+ val STREAMING_CHECKPOINT_STATE_CREATE_METADATA_DIR_ON_READ =
+ buildConf("spark.sql.streaming.checkpoint.stateCreateMetadataDirOnRead")
Review Comment:
Why do we want to add a flag for this ?
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/checkpointing/CommitLog.scala:
##########
@@ -46,8 +46,11 @@ import org.apache.spark.sql.internal.SQLConf
* line 1: version
* line 2: metadata (optional json string)
*/
-class CommitLog(sparkSession: SparkSession, path: String)
- extends HDFSMetadataLog[CommitMetadata](sparkSession, path) {
+class CommitLog(
+ sparkSession: SparkSession,
+ path: String,
+ readOnly: Boolean = false)
Review Comment:
Should we separate these 2 changes ?
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829800115
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -331,7 +334,11 @@ class OperatorStateMetadataV2Reader(
private val metadataDirPath = OperatorStateMetadataV2.metadataDirPath(stateCheckpointPath)
private lazy val fm = CheckpointFileManager.create(metadataDirPath, hadoopConf)
- fm.mkdirs(metadataDirPath.getParent)
+ if (createMetadataDir && !fm.exists(metadataDirPath.getParent)) {
+ fm.mkdirs(metadataDirPath.getParent)
+ } else if (!createMetadataDir) {
+ logInfo(log"Skipping metadata directory creation (createMetadataDir=false)")
Review Comment:
Will we get enough identifying info for the query with this log ? should we add any more parameters ?
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "liviazhu (via GitHub)" <gi...@apache.org>.
liviazhu commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829758964
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -352,7 +357,7 @@ class OperatorStateMetadataV2Reader(
// List the available batches in the operator metadata directory
private def listOperatorMetadataBatches(): Array[Long] = {
- if (!fm.exists(metadataDirPath)) {
+ if (!fm.exists(metadataDirPath.getParent) || !fm.exists(metadataDirPath)) {
Review Comment:
If we don't do this, if state directory doesn't exist, this will throw an error rather than return an empty list. To maintain the previous behavior, we add this check to return the empty list.
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "liviazhu (via GitHub)" <gi...@apache.org>.
liviazhu commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829779416
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateSchemaCompatibilityChecker.scala:
##########
@@ -96,7 +97,9 @@ class StateSchemaCompatibilityChecker(
private val fm = CheckpointFileManager.create(schemaFileLocation, hadoopConf)
- fm.mkdirs(schemaFileLocation.getParent)
+ if (createSchemaDir && !fm.exists(schemaFileLocation.getParent)) {
+ fm.mkdirs(schemaFileLocation.getParent)
Review Comment:
Done
##########
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/v2/state/StateDataSourceReadSuite.scala:
##########
@@ -1501,3 +1502,169 @@ abstract class StateDataSourceReadSuite extends StateDataSourceTestBase with Ass
}
}
}
+
+/**
+ * Test suite that verifies the state data source reader does not create empty state
+ * directories when reading state for all stateful operators.
+ *
+ * The reader does not create metadata directories (no mkdirs on the schema metadata path).
+ * This is important for
+ * Unity Catalog environments where creating directories requires WRITE FILES permission,
Review Comment:
Done
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "liviazhu (via GitHub)" <gi...@apache.org>.
liviazhu commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829778830
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -331,7 +334,9 @@ class OperatorStateMetadataV2Reader(
private val metadataDirPath = OperatorStateMetadataV2.metadataDirPath(stateCheckpointPath)
private lazy val fm = CheckpointFileManager.create(metadataDirPath, hadoopConf)
- fm.mkdirs(metadataDirPath.getParent)
+ if (createMetadataDir) {
+ fm.mkdirs(metadataDirPath.getParent)
Review Comment:
Done
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -352,7 +357,7 @@ class OperatorStateMetadataV2Reader(
// List the available batches in the operator metadata directory
private def listOperatorMetadataBatches(): Array[Long] = {
- if (!fm.exists(metadataDirPath)) {
+ if (!fm.exists(metadataDirPath.getParent) || !fm.exists(metadataDirPath)) {
Review Comment:
Done
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Re: [PR] [SPARK-55493] [SS] Do not mkdirs in streaming checkpoint state directory in StateDataSource [spark]
Posted by "anishshri-db (via GitHub)" <gi...@apache.org>.
anishshri-db commented on code in PR #54277:
URL: https://github.com/apache/spark/pull/54277#discussion_r2829718188
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala:
##########
@@ -331,7 +334,9 @@ class OperatorStateMetadataV2Reader(
private val metadataDirPath = OperatorStateMetadataV2.metadataDirPath(stateCheckpointPath)
private lazy val fm = CheckpointFileManager.create(metadataDirPath, hadoopConf)
- fm.mkdirs(metadataDirPath.getParent)
+ if (createMetadataDir) {
+ fm.mkdirs(metadataDirPath.getParent)
Review Comment:
Can we add an INFO log in the else case ?
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