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Posted to issues@iceberg.apache.org by "zeroshade (via GitHub)" <gi...@apache.org> on 2026/01/27 16:21:05 UTC
[PR] fix(table): use proper data file names [iceberg-go]
zeroshade opened a new pull request, #702:
URL: https://github.com/apache/iceberg-go/pull/702
fixes #697
Follows the same standard as the java implementation to generate data file names appropriately.
Adds a test to confirm the name generation.
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737858860
##########
table/writer.go:
##########
@@ -33,15 +33,18 @@ import (
type WriteTask struct {
Uuid uuid.UUID
ID int
+ PartitionID int // Added: partition ID for file naming
+ FileCount int // Added: file counter within this task
Schema *iceberg.Schema
Batches []arrow.RecordBatch
SortOrderID int
}
func (w WriteTask) GenerateDataFileName(extension string) string {
// Mimics the behavior in the Java API:
- // https://github.com/apache/iceberg/blob/a582968975dd30ff4917fbbe999f1be903efac02/core/src/main/java/org/apache/iceberg/io/OutputFileFactory.java#L92-L101
- return fmt.Sprintf("00000-%d-%s.%s", w.ID, w.Uuid, extension)
+ // https://github.com/apache/iceberg/blob/main/core/src/main/java/org/apache/iceberg/io/OutputFileFactory.java
Review Comment:
that's a good point, i'll put it back
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "Copilot (via GitHub)" <gi...@apache.org>.
Copilot commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2739970096
##########
table/writer.go:
##########
@@ -33,15 +33,18 @@ import (
type WriteTask struct {
Uuid uuid.UUID
ID int
+ PartitionID int // Added: partition ID for file naming
+ FileCount int // Added: file counter within this task
Review Comment:
The "Added:" prefix in comments is typically used temporarily during code reviews but should be removed before merging to production. Standard Go documentation comments should describe what the field does, not that it was recently added. Consider updating these comments to describe the purpose of the field instead.
```suggestion
PartitionID int // PartitionID is the partition identifier used in data file naming.
FileCount int // FileCount is a sequential counter for files written by this task.
```
##########
table/rolling_data_writer.go:
##########
@@ -156,13 +166,16 @@ func (r *RollingDataWriter) flushToDataFile(batch []arrow.RecordBatch, outputDat
}
task := iter.Seq[WriteTask](func(yield func(WriteTask) bool) {
- cnt := int(r.factory.counter.Add(1) - 1)
+ cnt, _ := r.factory.nextCount()
Review Comment:
This line calls `nextCount()` which is created by `iter.Pull()` in the writerFactory. According to Go's documentation, the functions returned by `iter.Pull` are not safe for concurrent use. Since multiple RollingDataWriter instances can call `flushToDataFile` concurrently (each in its own goroutine from the `stream` method), this creates a concurrency safety violation.
The writerFactory needs to protect access to `nextCount()` with a mutex to ensure thread-safe counter increments across multiple partition writers.
##########
internal/utils.go:
##########
@@ -164,12 +165,15 @@ func RecoverError(err *error) {
}
func Counter(start int) iter.Seq[int] {
+ var current atomic.Int64
+ current.Store(int64(start))
+
return func(yield func(int) bool) {
for {
- if !yield(start) {
+ if !yield(int(current.Load())) {
return
}
- start++
+ current.Add(1)
Review Comment:
There is a race condition in this implementation. The current code performs a Load followed by an Add in separate operations, which means two concurrent goroutines could both load the same value before either increments it, resulting in duplicate counter values.
The correct implementation should atomically fetch-and-increment the value before yielding it. This ensures each caller gets a unique, sequential counter value even in concurrent scenarios.
##########
table/rolling_data_writer.go:
##########
@@ -60,6 +66,8 @@ func NewWriterFactory(rootLocation string, args recordWritingArgs, meta *Metadat
// file strategy to manage file sizes.
type RollingDataWriter struct {
partitionKey string
+ partitionID int // Added: unique ID for this partition
+ fileCount atomic.Int64 // Added: counter for files in this partition
Review Comment:
The "Added:" prefix in comments is typically used temporarily during code reviews but should be removed before merging to production. Standard Go documentation comments should describe what the field does, not that it was recently added. Consider updating these comments to describe the purpose of each field instead.
##########
table/rolling_data_writer.go:
##########
@@ -33,25 +33,31 @@ import (
// for different partitions, providing shared configuration and coordination
// across all writers in a partitioned write operation.
type writerFactory struct {
- rootLocation string
- args recordWritingArgs
- meta *MetadataBuilder
- taskSchema *iceberg.Schema
- targetFileSize int64
- writers sync.Map
- counter atomic.Int64
- mu sync.Mutex
+ rootLocation string
+ args recordWritingArgs
+ meta *MetadataBuilder
+ taskSchema *iceberg.Schema
+ targetFileSize int64
+ writers sync.Map
+ nextCount func() (int, bool)
+ stopCount func()
+ partitionIDCounter atomic.Int64 // Added: counter for partition IDs
Review Comment:
The "Added:" prefix in comments is typically used temporarily during code reviews but should be removed before merging to production. Standard Go documentation comments should describe what the field does, not that it was recently added. Consider updating this comment to describe the purpose of the field instead.
```suggestion
partitionIDCounter atomic.Int64 // partitionIDCounter generates unique IDs for partitions
```
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "ferhatelmas (via GitHub)" <gi...@apache.org>.
ferhatelmas commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737450124
##########
table/writer_test.go:
##########
@@ -0,0 +1,156 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package table
+
+import (
+ "testing"
+
+ "github.com/google/uuid"
+ "github.com/stretchr/testify/assert"
+ "github.com/stretchr/testify/require"
+)
+
+func TestGenerateDataFileName(t *testing.T) {
+ tests := []struct {
Review Comment:
worth of adding a test with partition id and file count more than 5 digits?
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737892863
##########
table/writer_test.go:
##########
@@ -0,0 +1,156 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package table
+
+import (
+ "testing"
+
+ "github.com/google/uuid"
+ "github.com/stretchr/testify/assert"
+ "github.com/stretchr/testify/require"
+)
+
+func TestGenerateDataFileName(t *testing.T) {
+ tests := []struct {
Review Comment:
I don't think there's necessarily much worth to it, but it's also a pretty low cost addition so I'll add it
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "ferhatelmas (via GitHub)" <gi...@apache.org>.
ferhatelmas commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737402562
##########
table/writer_test.go:
##########
@@ -0,0 +1,156 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package table
+
+import (
+ "testing"
+
+ "github.com/google/uuid"
+ "github.com/stretchr/testify/assert"
+ "github.com/stretchr/testify/require"
+)
+
+func TestGenerateDataFileName(t *testing.T) {
+ tests := []struct {
+ name string
+ task WriteTask
+ extension string
+ wantPattern string // regex pattern to match
Review Comment:
this doesn't seem to be a regex, maybe just rename to `want` and drop the comment
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737869956
##########
table/writer_test.go:
##########
@@ -0,0 +1,156 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package table
+
+import (
+ "testing"
+
+ "github.com/google/uuid"
+ "github.com/stretchr/testify/assert"
+ "github.com/stretchr/testify/require"
+)
+
+func TestGenerateDataFileName(t *testing.T) {
+ tests := []struct {
+ name string
+ task WriteTask
+ extension string
+ wantPattern string // regex pattern to match
Review Comment:
yea, that comment is from a previous version of this
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "ferhatelmas (via GitHub)" <gi...@apache.org>.
ferhatelmas commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737358113
##########
table/rolling_data_writer.go:
##########
@@ -157,12 +162,15 @@ func (r *RollingDataWriter) flushToDataFile(batch []arrow.RecordBatch, outputDat
task := iter.Seq[WriteTask](func(yield func(WriteTask) bool) {
cnt := int(r.factory.counter.Add(1) - 1)
+ fileCount := int(r.fileCount.Add(1))
yield(WriteTask{
- Uuid: *r.factory.args.writeUUID,
- ID: cnt,
- Schema: r.factory.taskSchema,
- Batches: batch,
+ Uuid: *r.factory.args.writeUUID,
+ ID: cnt,
Review Comment:
nit: not exactly related to this PR but isn't `cnt` supposed to initialize by the given `args.counter` as in unpartitioned case?
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "kevinjqliu (via GitHub)" <gi...@apache.org>.
kevinjqliu commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2740032484
##########
internal/utils.go:
##########
@@ -164,12 +165,15 @@ func RecoverError(err *error) {
}
func Counter(start int) iter.Seq[int] {
+ var current atomic.Int64
+ current.Store(int64(start))
+
return func(yield func(int) bool) {
for {
- if !yield(start) {
+ if !yield(int(current.Load())) {
return
}
- start++
+ current.Add(1)
Review Comment:
this seems valid, @zeroshade wdyt?
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737757866
##########
table/rolling_data_writer.go:
##########
@@ -157,12 +162,15 @@ func (r *RollingDataWriter) flushToDataFile(batch []arrow.RecordBatch, outputDat
task := iter.Seq[WriteTask](func(yield func(WriteTask) bool) {
cnt := int(r.factory.counter.Add(1) - 1)
+ fileCount := int(r.fileCount.Add(1))
yield(WriteTask{
- Uuid: *r.factory.args.writeUUID,
- ID: cnt,
- Schema: r.factory.taskSchema,
- Batches: batch,
+ Uuid: *r.factory.args.writeUUID,
+ ID: cnt,
Review Comment:
that's a good point and worthwhile to fix in here.
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "ferhatelmas (via GitHub)" <gi...@apache.org>.
ferhatelmas commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737378758
##########
table/arrow_utils.go:
##########
@@ -1338,13 +1338,17 @@ func recordsToDataFiles(ctx context.Context, rootLocation string, meta *Metadata
tasks := func(yield func(WriteTask) bool) {
defer stopCount()
+ fileCount := 0
for batch := range binPackRecords(args.itr, 20, targetFileSize) {
cnt, _ := nextCount()
+ fileCount++
t := WriteTask{
- Uuid: *args.writeUUID,
- ID: cnt,
- Schema: taskSchema,
- Batches: batch,
+ Uuid: *args.writeUUID,
+ ID: cnt,
+ PartitionID: 0, // unpartitioned tables use 0
Review Comment:
does it make sense to use unpartitioned spec id directly?
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade merged PR #702:
URL: https://github.com/apache/iceberg-go/pull/702
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2771234001
##########
table/rolling_data_writer.go:
##########
@@ -156,13 +166,16 @@ func (r *RollingDataWriter) flushToDataFile(batch []arrow.RecordBatch, outputDat
}
task := iter.Seq[WriteTask](func(yield func(WriteTask) bool) {
- cnt := int(r.factory.counter.Add(1) - 1)
+ cnt, _ := r.factory.nextCount()
Review Comment:
we made sure the base counter is safe for concurrent use, so I think this should be fine as long as we make sure that `args.counter` is defined as having to be safe for concurrent use.
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "ferhatelmas (via GitHub)" <gi...@apache.org>.
ferhatelmas commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737371622
##########
table/writer.go:
##########
@@ -33,15 +33,18 @@ import (
type WriteTask struct {
Uuid uuid.UUID
ID int
+ PartitionID int // Added: partition ID for file naming
+ FileCount int // Added: file counter within this task
Schema *iceberg.Schema
Batches []arrow.RecordBatch
SortOrderID int
}
func (w WriteTask) GenerateDataFileName(extension string) string {
// Mimics the behavior in the Java API:
- // https://github.com/apache/iceberg/blob/a582968975dd30ff4917fbbe999f1be903efac02/core/src/main/java/org/apache/iceberg/io/OutputFileFactory.java#L92-L101
- return fmt.Sprintf("00000-%d-%s.%s", w.ID, w.Uuid, extension)
+ // https://github.com/apache/iceberg/blob/main/core/src/main/java/org/apache/iceberg/io/OutputFileFactory.java
Review Comment:
IMO [permalink](https://github.com/apache/iceberg/blob/03ed4ba9af4e47d32bdb22b7e3d033eb2a4b2c83/core/src/main/java/org/apache/iceberg/io/OutputFileFactory.java#L93-L103) was better if file or line changes
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Re: [PR] fix(table): use proper data file names [iceberg-go]
Posted by "ferhatelmas (via GitHub)" <gi...@apache.org>.
ferhatelmas commented on code in PR #702:
URL: https://github.com/apache/iceberg-go/pull/702#discussion_r2737391851
##########
table/arrow_utils.go:
##########
@@ -1338,13 +1338,17 @@ func recordsToDataFiles(ctx context.Context, rootLocation string, meta *Metadata
tasks := func(yield func(WriteTask) bool) {
defer stopCount()
+ fileCount := 0
for batch := range binPackRecords(args.itr, 20, targetFileSize) {
Review Comment:
aside, 20 seems like the default used in multiple locations, might benefit from putting it into a constant
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