Allow using composed storage for SuperSorter intermediate data by rohangarg · Pull Request #13368 · apache/druid

rohangarg · 2022-11-15T09:02:52Z

Currently, the SuperSorter intermediate data can only be stored on locally mounted disks. Many a times, this leads to MSQ job failures due to limited local space available. To remedy this problem, we want to support composable storage for SuperSorter intermediate data which allows the data to be stored on multiple storage systems through fallbacks.

To implement composable storage for SuperSorter intermediate data, first we need to allow for using durable storage in SuperSorter's intermediate data. For that, now :

OutputChannelFactory can now create partitioned output channels which can comprise of multiple partitions
The frame footer code is extracted and is being used by both local-file based storage and durable storage. It is needed to read partitions from partitioned output channels
Durable storage connectors use a range read interface to read specific partitions
The durable storage readable channel now supports reading frames only as well. Earlier it needed the input data to be a full frame file.

Further, now a CompositionOutputChannelFactory is created which takes in an ordered list of OutputChannelFactory. The composition factory writes/reads to/from an output channel only until the channel allows it, and transparently moves ahead to the next output channel factory in the list once the current channel reaches its limits. As of now, the composition can only be made of local storage and durable storage - in future we'd also want to allow for memory storage to be a part of the composition.
The composition factory can be enabled with the boolean context parameter : composedIntermediateSuperSorterStorageEnabled.
Also, to set a limit on the maximum amount of local space SuperSorter's intermediate output can take, we can set the following numeric context parameter : intermediateSuperSorterStorageMaxLocalBytes.

Key changed/added classes in this PR

PartitionedOutputChannel
PartitionedReadableFrameChannel
FrameFileFooter
DurablePartitionedReadableFrameChannel
ByteTracker
ComposingReadableFrameChannel
ComposingWritableFrameChannel
ComposingOutputChannelFactory
FrameFileWriter

Release Note
Enable composed storage for SuperSorter intermediate data by enabling composedIntermediateSuperSorterStorageEnabled context parameter. Along with this parameter, the user should also configure intermediateSuperSorterStorageMaxLocalBytes to limit the amount of intermediate data being written. The recommendation is to set this ~ 70% of the disk available to an MSQ task. Finally to allow falling back to the durable storage, the durable storage feature flag and configurations should also be configured.

This PR has:

LakshSingla

Thanks for the PR 🚀 Left some initial comments around the helper classes. Will review the implementation later.

LakshSingla · 2022-11-15T12:06:32Z

  public static final String CTX_ENABLE_DURABLE_SHUFFLE_STORAGE = "durableShuffleStorage";
  private static final boolean DEFAULT_ENABLE_DURABLE_SHUFFLE_STORAGE = false;

+  public static final String CTX_ENABLE_DURABLE_TASK_INTERMEDIATE_STORAGE = "durableTaskIntermediateStorage";


I think that we should somehow try to merge this config property with durableShuffleStorage to make it easier for the users to configure. Adding another property means that the user can now have up to 4 configurations of durableShuffleStorage and durableTaskIntermediateStorage each with different semantics. WDYT?

I had initially added the separate feature flag because durable storage reads were coming to be very slow - which would lead to slow UTs and also slow unintended user queries. Now that #13373 is merged, I have removed the extra flag. Also made the super sorter test run with both file based and durable storage based output channels

LakshSingla · 2022-11-15T12:49:47Z

+   * @return InputStream starting from the given offset limited by the given size
+   * @throws IOException if the path is not present or the unable to read the data present on the path
+   */
+  InputStream readRange(String path, long from, long size) throws IOException;


Should the behaviour of the implementations be defined here under following conditions:

from > size of underlying storage (undefined, error, or we return empty output)

from + size > size of underlying storage (undefined, error, or we chomp the stream)

from < 0 (undefined, error, or from indicates index from the end)

size < 0 (undefined, error, or we read in reverse)

have added some validation checks for inputs in local and s3 connector. haven't done the size based check in s3 connector yet since it'll require a status api call for the object first - I'm not sure if it is necessary to do that check as of now.

lgtm-com · 2022-11-16T08:31:00Z

This pull request introduces 4 alerts when merging 7c437c0 into 9e938b5 - view on LGTM.com

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gianm

Skimmed through and had some comments on the interfaces.

gianm · 2022-11-16T17:20:06Z

+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class PartitionedOutputChannel


I wonder if this could be rolled into OutputChannel? i.e. by adding a method like, ReadableFrameChannel getReadableChannel(int partitionNumber). It would throw an error for non-partitioned outputs.

I tried rolling both of them into the same class - but it gets a bit messy since OutputChannel also takes partitionNumber as an input and provides method to fetch it. So, the operations related to partitionNumber would also have to be checked before returning error or output along with getReadableChannel(partition) and getReadableChannel()

gianm · 2022-11-16T17:21:23Z

+ * Provides an interface to read a partitioned frame channel. The channel might have frames with multiple partitions
+ * in it.
+ */
+public interface PartitionedReadableFrameChannel extends Closeable


This is more of a supplier than an actual channel, so PartitionedReadableFrameChannelSupplier, or something like that, would be a clearer name.

Javadocs should also describe what happens when this is closed.

I tried changing it to PartitionedReadableFrameChannelSupplier but it becomes a bit confusing later on since the readable channels are sent around wrapped in another Supplier object. It ends up looking like Supplier< PartitionedReadableFrameChannelSupplier>.
I have changed the method name a bit in the interface to make things more clear. Please let me know if this looks ok or should we change to supplier suffix for more clarity

…uper_sorter

lgtm-com · 2022-11-22T19:59:06Z

This pull request introduces 4 alerts when merging 3553f9e into 7cf761c - view on LGTM.com

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lgtm-com · 2022-11-28T07:15:30Z

This pull request introduces 4 alerts when merging 159c5d7 into db7c29c - view on LGTM.com

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LakshSingla · 2022-11-28T11:57:37Z

+  public void close()
+  {
+    try {
+      storageConnector.deleteFile(frameFileFullPath);


If the footerFile and frameFileFullPath are not created in the channel then should they be deleted on close or should the responsibility lie with the object's creator?

These files are created by the writable channel and are passed to the readable channel - so I think it should be ok to delete them when the readable channel closes. The resources are passed b/w writable-readable channel since the output-channel doesn't provide an explicit close method.

LakshSingla · 2022-11-28T11:58:06Z

+    this.frameFileFooterSupplier = frameFileFooterSupplier;
+    this.frameFileFullPath = frameFileFullPath;
+    this.remoteInputStreamPool = remoteInputStreamPool;
+    this.footerFile = footerFile;


nit: Do we need this? I didn't find relevance of this param in the file apart from in the close method.

It is needed since we're deleting the file with the close of the readable channel

…uper_sorter Conflicts: extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/MSQSelectTest.java

lgtm-com · 2022-11-30T10:43:54Z

This pull request introduces 4 alerts when merging 55bddeb into 50963ed - view on LGTM.com

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cryptoe

Need to go through the frameFileFooter code. Will finish the review by EOD

cryptoe · 2022-11-17T13:19:43Z

+    this.durableStageStorageEnabled = MultiStageQueryContext.isDurableShuffleStorageEnabled(
+        QueryContext.of(task.getContext())
+    );
+    this.durableTaskIntermediateStorageEnabled = MultiStageQueryContext.isDurableTaskIntermediateStorageEnabled(


I think we do not need this parameter at all. Eventually, we would use tiered spilling so I think we should be okay if we are spilling everything to remote storage.

cryptoe · 2022-12-19T04:44:25Z

        - sh -c "dmesg | egrep -i '(oom|out of memory|kill process|killed).*' -C 1 || exit 0"
        - free -m
-        - ${MVN} -pl ${MAVEN_PROJECTS} jacoco:report
+        - travis_wait 15 ${MVN} -pl ${MAVEN_PROJECTS} jacoco:report


I think this change would be orthogonal to the PR no?

No, this is needed since SuperSorterTest runs for > 10 minutes sometimes and doesn't produce any log in a successful case. So, the wait for test to finish is increased to 15 minutes.

cryptoe · 2022-12-19T04:52:03Z

+  @Override
+  public InputStream readRange(String path, long from, long size) throws IOException
+  {
+    if (from < 0 || size < 0) {


Can the public InputStream read(String path) throws IOException and this method use the same common base method?
Maybe pass the method the GetObjectRequest , that way there is less duplication.

Thanks for the pointer, combined their logic.

cryptoe · 2022-12-19T04:58:08Z

    );
  }
+
+


Nit: Lets java doc this method.

added javadocs

cryptoe · 2023-01-03T06:15:13Z

+  /**
+   * Create a channel pair tagged with a particular name and a flag to delete the channel data after its read.
+   */
+  PartitionedOutputChannel openPartitionedChannel(String name, boolean deleteAfterRead) throws IOException;


I have a similar comment like @gianm . I think the two interface calls looks very similar.
Couple of questions:

Does partitionName have to be a string and not an int or another way is why not work with partition numbers only ?

From the javadoc, the pair seems to be of a OutputChannel and the partition name and if the channel data needs to be deleted on exit. My question is the called would be interested in the output channel for that "partition" and clean up. So why do we need another API for this. We could have a cleaning output channel factory impl which could do the cleaning for us no ?

the name is not a partition name, but rather a generic name for the channel which can contain multiple partitions.

FrameFiles can be shared amongst multiple independent readers currently - and they are deleted only when all references to the file are removed. So, that's why had to pass the deletion flag down to the channel creator. A cleaning factory could be created but then it would also have to do ref counting per frame file before cleaning.

cryptoe · 2023-01-03T06:17:27Z

+  private final Supplier<PartitionedReadableFrameChannel> readableChannelSupplier;
+
+  private PartitionedOutputChannel(
+      @Nullable final WritableFrameChannel writableChannel,


can the nullable be removed since you are doing a precheck in pair method ?

cryptoe · 2023-01-03T06:19:24Z

+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class PartitionedOutputChannel


class level docs would be very helpful here.
Outline could be:

What does this class do.

Where is it used.

Thanks for the pointer, added the javadocs

cryptoe · 2023-01-03T06:25:18Z

+            new CountingWritableFrameChannel(
+                baseChannel.getWritableChannel(),
+                channelCounters,
+                null


why is empty partition Number passed here ?

It is passed because the channel can contain multiple partitions, so the partition number is looked upon every frame being written

cryptoe · 2023-01-03T14:32:12Z

+
+/**
+ * Encapsulation for ƒrame file footer related operations. The footer must be wrapped in a memory object (the memory
+ * can be physical or mmaped). Some verifications are also done on the footer to see if it is not corrupted.


nit: lets link the java doc of frameFile to this class so that we can find out the format of the frame footer.

thanks for the pointer, done!

cryptoe · 2023-01-03T14:37:59Z

+    final Supplier<Long> channelSizeSupplier = countingOutputStream::getCount;
+
+    final File footerFile = new File(tmpDir, fileName + "_footer");
+    // build supplier for reader the footer of the underlying frame file


nit: reading

(cherry picked from commit 17fc776)

(cherry picked from commit e0809db)

…uper_sorter Conflicts: extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQControllerTask.java extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/MSQSelectTest.java

+
+    final Supplier<Long> channelSizeSupplier = countingOutputStream::getCount;
+
+    final File footerFile = new File(tmpDir, fileName + "_footer");


+        // read the footer into a file and map it to memory
+        FileUtils.mkdirp(footerFile.getParentFile());
+        Preconditions.checkState(footerFile.createNewFile(), "Unable to create local footer file");
+        try (FileOutputStream footerFileStream = new FileOutputStream(footerFile);


cryptoe

Took a look at the composing channel. Left some comments.

cryptoe · 2023-01-16T09:58:33Z

  }

+  @Override
+  public InputStream readRange(String path, long from, long size) throws IOException


nit: from-> start seems better. Feel free to ignore this.

cryptoe · 2023-01-16T10:00:04Z

+            MultiStageQueryContext.isComposedIntermediateSuperSorterStorageEnabled(
+                task.getQuerySpec().getQuery().context()
+            )
+        ).put(


If the CTX_COMPOSED_INTERMEDIATE_SUPER_SORTER_STORAGE only then CTX_INTERMEDIATE_SUPER_SORTER_STORAGE_MAX_LOCAL_BYTES should be set no ?

I think they can work independently - the local bytes limit just enforces a resource limit on the local storage and the composition storage enables joining local disk and durable storage together.
Currently, the CTX_INTERMEDIATE_SUPER_SORTER_STORAGE_MAX_LOCAL_BYTES is defaulted as Long.MAX_VALUE and is used in the normal flow as well to keep consistency. WDYT?

I think we should throw an error if one sets CTX_COMPOSED_INTERMEDIATE_SUPER_SORTER_STORAGE and CTX_INTERMEDIATE_SUPER_SORTER_STORAGE_MAX_LOCAL_BYTES is not set.

What will happen is the users will set this flag thinking stuff is going to work but they would be proved wrong.
As @paul-rogers, throwing errors is a way for people to force reading documentation ^-^

Yes, I agree with the documentation part but setting CTX_INTERMEDIATE_SUPER_SORTER_STORAGE_MAX_LOCAL_BYTES is also not enough for composition. The user would also have to set the durable storage setting and all the configurations along with it. And in future, if any memory storage is allowed in composition, then that is needed too.
So, I thought the documentation for the composition parameter would clearly state what all is needed to configure it properly.

cryptoe · 2023-01-16T10:09:56Z

+    );
+  }
+
+  public static long getIntermediateSuperSorterStorageMaxLocalBytes(final QueryContext queryContext)


If isComposedIntermediateSuperSorterStorageEnabled is enabled and getIntermediateSuperSorterStorageMaxLocalBytes is not set ie default value, what will happen?

The default values for getIntermediateSuperSorterStorageMaxLocalBytes is Long.MAX_VALUE so effectively it will only use local disk as before.

cryptoe · 2023-01-16T10:13:42Z

+  {
+    Preconditions.checkState(byteCount >= 0, "Can't reserve negative bytes");
+    if (currentBytes + byteCount > maxBytes) {
+      throw new ResourceLimitExceededException("");


I think there is a todo here.

Yes, thanks for catching! updated the message.

cryptoe · 2023-01-16T10:14:07Z

+import org.apache.druid.query.ResourceLimitExceededException;
+
+/**
+ * Tracks the byte usage with an upper bound bytes limit. Reservaction of bytes beyond limit throws


Nit spelling: Reservaction

thanks! fixed

cryptoe · 2023-01-16T10:27:35Z

+ * A composed readable channel to read frames. The channel can encapsulate multiple readable channels in it and
+ * automatically switches to next channels once the currently read channel is finished.
+ */
+public class ComposingReadableFrameChannel implements ReadableFrameChannel


Please mention that this is not threadsafe as well.

Marked it with NotThreadSafe annotation.

cryptoe · 2023-01-16T10:31:23Z

+  @Override
+  public boolean isFinished()
+  {
+    initCurrentChannel();


Should we make this class threadSafe ?

I don't think there can be multiple readers for the same composing readable channel - am I missing something?

cryptoe · 2023-01-16T10:33:36Z

+  @Override
+  public void close()
+  {
+    if (currentChannel != null) {


Shouldnt we close all the "channels here"
Releases any resources associated with this readable channel. After calling this, you should not call any other methods on the channel.

Same case as writable channels - the previous ones are closed before moving to next and the future ones are lazy.

cryptoe · 2023-01-16T10:44:07Z

+    }
+
+    try {
+      channels.get(currentIndex).get().write(frameWithPartition);


We are relying on an exception as a signal to try the next Writer.
So should we enfore a "sorterBySize" ordering in the channel Supplier?

IMHO, can we respond with a boolean if the write fails instead of relying on an exception?

The ordering is fixed currently in the composing factory - it is always disk followed by durable storage.
I had tried using a custom object/error instead of an exception but that seemed overkill currently since there's only one such case right now. I have added a comment explaining the need and also that we can create custom objects in future if the logic becomes complex

cryptoe · 2023-01-16T10:45:15Z

+  public void close() throws IOException
+  {
+    if (currentIndex < channels.size()) {
+      channels.get(currentIndex).get().close();


should we close all channels ?

The write channels are created lazily, so closing the upcoming ones is not needed. And the previous ones are closed before moving to the next one.

…uper_sorter Conflicts: extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/exec/ControllerImpl.java extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/indexing/MSQWorkerTaskLauncher.java extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/util/MultiStageQueryContext.java extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/MSQTasksTest.java extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/test/MSQTestBase.java extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/util/MultiStageQueryContextTest.java

cryptoe · 2023-01-20T06:29:16Z

          }
          if (byteTracker != null) {
-            byteTracker.release(fileLength);
+            // only release the bytes taken by frames, we don't track the header and footer as of now


Just curious why was this change needed from the file length to fileLen - header - footer.

this was needed since we're not tracking header and footer size as of now (due to difficulties with empty frame files). I have added an explanation for this in the code - it could be picked up in the future if needed.
Also, the assumption is that frame data would be much larger than the header + footer sizes.

cryptoe

Changes LGTM.

…e#13368)

PR apache#13368 replaced a FrameFile cache with a PartitionedOutputChannel cache. Unfortunately, these objects are heavyweight: each has a writable channel and a frame memory allocator with an 8MB arena. This patch replaces it with a Supplier<PartitionedReadableFrameChannel>, which is lighter weight, and is all that was needed anyway.

rohangarg added the Area - MSQ For multi stage queries - https://github.com/apache/druid/issues/12262 label Nov 15, 2022

rohangarg force-pushed the durable_storage_super_sorter branch from 2eb7df2 to ad9f07e Compare November 15, 2022 09:04

LakshSingla reviewed Nov 15, 2022

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LakshSingla mentioned this pull request Nov 16, 2022

Worker retry for MSQ task #13353

Merged

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gianm reviewed Nov 16, 2022

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rohangarg added 6 commits November 22, 2022 02:02

Allow using durable storage for SuperSorter intermediate data

3a24539

Fix empty reads

246620a

Review fixes

e1cda34

parameterize tests

9a04190

Review fixes

b052196

Merge remote-tracking branch 'upstream/master' into durable_storage_s…

3553f9e

…uper_sorter

rohangarg force-pushed the durable_storage_super_sorter branch from 7c437c0 to 3553f9e Compare November 22, 2022 18:06

Move durable storage classes

159c5d7

rohangarg force-pushed the durable_storage_super_sorter branch from 7064142 to 159c5d7 Compare November 28, 2022 05:53

LakshSingla reviewed Nov 28, 2022

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rohangarg added 2 commits November 30, 2022 12:29

Review fixes

98c91c7

Merge remote-tracking branch 'upstream/master' into durable_storage_s…

55bddeb

…uper_sorter Conflicts: extensions-core/multi-stage-query/src/test/java/org/apache/druid/msq/exec/MSQSelectTest.java

cryptoe reviewed Jan 3, 2023

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rohangarg added 6 commits January 9, 2023 00:53

Review comments

7b41c0b

Add composed output channels

5855d69

Test output channel factories

5ea228d

(cherry picked from commit 17fc776)

Add flags for composition and local storage limit

8ac983a

(cherry picked from commit e0809db)

more javadocs

fddcb0b

github-advanced-security AI found potential problems Jan 10, 2023

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cryptoe reviewed Jan 16, 2023

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rohangarg added 2 commits January 18, 2023 11:31

Fix up byte calculation

5bfe457

github-advanced-security AI found potential problems Jan 18, 2023

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Comment thread processing/src/main/java/org/apache/druid/frame/channel/ByteTracker.java Fixed

Comment thread processing/src/test/java/org/apache/druid/frame/testutil/FrameTestUtil.java Fixed

Review comments

cc96a2b

rohangarg changed the title ~~Allow using durable storage for SuperSorter intermediate data~~ Allow using composed storage for SuperSorter intermediate data Jan 19, 2023

cryptoe reviewed Jan 20, 2023

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user documentation for parameters and tracking comment

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cryptoe approved these changes Jan 20, 2023

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rohangarg merged commit f76accc into apache:master Jan 23, 2023

abhagraw pushed a commit to abhagraw/druid that referenced this pull request Feb 8, 2023

Allow using composed storage for SuperSorter intermediate data (apach…

973adff

…e#13368)

gianm mentioned this pull request Mar 10, 2023

SuperSorter: Avoid storing extra writable channels. #13915

Closed

clintropolis added this to the 26.0 milestone Apr 10, 2023

techdocsmith mentioned this pull request Apr 12, 2023

[DRAFT] 26.0.0 release notes #14064

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		final Supplier<Long> channelSizeSupplier = countingOutputStream::getCount;

		final File footerFile = new File(tmpDir, fileName + "_footer");

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rohangarg commented Nov 15, 2022 •

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