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Posted to reviews@impala.apache.org by "Yida Wu (Code Review)" <ge...@cloudera.org> on 2020/12/29 03:54:53 UTC
[Impala-ASF-CR] IMPALA-9867: Add Support for Spilling to S3: Milestone 1
Yida Wu has uploaded a new patch set (#23). ( http://gerrit.cloudera.org:8080/16318 )
Change subject: IMPALA-9867: Add Support for Spilling to S3: Milestone 1
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IMPALA-9867: Add Support for Spilling to S3: Milestone 1
Major Features
1) Local files as buffers for spilling to S3.
2) Async Upload for remote files.
3) Sync remote files deletion after query ends.
4) Local buffer files management.
5) Compatibility of spilling to local and remote.
6) All the errors from hdfs/s3 should terminate the query.
Changes on TmpFile:
* TmpFile is separated into two types of implementation, TmpFileLocal
and TmpFileRemote.
TmpFileLocal is used for Spilling to local file system.
TmpFileRemote is a new type for Spilling to the remote. It contains
two DiskFiles, one for local buffer, the other for the remote file.
* The DiskFile is an object that contains the information of a pysical
file for passing to the DiskIOMgr to execute the IO operations on
that specific file. The DiskFile also contains status information of
the file,includes DiskFileStatus::INWRITING/PERSISTED/DELETED.
When the DiskFile is initialized, it is in INWRITING status. If the
file is persisted into the file system, it would become PERSISTED
status. If the file is deleted, for example, the local buffer is
evicted, so the DiskFile status of the buffer file would become
deleted. After that, if the file is fetching from the remote, the
DiskFile status of the buffer file would become INWRITING, and then
PERSISTED if the fetching finishes successfully.
Implementation Details:
1) A new enum type is added to specify the disk type of files,
indicating where the file physically locates.
The types include DiskFileType::LOCAL/LOCAL_BUFFER/DFS/S3.
DiskFileType::LOCAL indicates the file is in the local file system.
DiskFileType::LOCAL_BUFFER indicates the file is in the local file
system, and it is the buffer of a remote scratch file.
DiskFileType::DFS/S3 indicates the file is in the HDFS/S3.
The local buffer allows the buffer pool to pin(read), but mainly
for remote files, buffer pool would pin(read) the page from the
remote file system.
2) Two disk queues have been added to do the file operation jobs.
Queue name: RemoteS3DiskFileOper/RemoteDfsDiskFileOper
File operations on the remote disk like upload and fetch should
be done in these queues. The purpose of the queues is to isolate
the file operations from normal read/write IO operations in different
queues. It could increase the efficiency of the file operations by
not being interrupted during a relatively long execution time, and
also provide a more accurate control on the thread number working on
file operation jobs.
RemoteOperRange is the new type to carry the file operation jobs.
Previously,we have request types of READ and WRITE.
Now FILE_FETCH/FILE_UPLOAD are added.
3) The tmp files are physically deleted when the tmp file group is
deconstructing. For remote files, the entire directory would be
deleted.
4) The local buffer files management is to control the total size
of local buffer files and evict files if needed.
A local buffer file can be evicted if the temporary file has uploaded
a copy to the remote disk or the query ends.
There are two modes to decide the sequence of choosing files to be
evicted first. Default is LIFO, the other is FIFO. It can be
controlled by startup option remote_tmp_files_avail_pool_lifo.
Also, a thread TmpFileSpaceReserveThreadLoop in TmpFileMgr is
running to allow to reserve buffer file space in an async way to
avoid deadlocks.
5) Spilling to local has higher priority than spilling to remote.
If no local scratch space is available, temporary data will be
spilled to remote.
The first available local directory is used for the local buffer
for spilling to remote if any remote directory is configured.
If remote directory is configured without any available local
scratch space, an error will be returned during initialization.
The purpose of the design is to simplify the implementation in
milestone 1 with less changes on the configuration.
Limitations:
* Only one remote scratch dir is supported.
* The first local scratch dir is used for the buffer of remote scratch
space if remote scratch dir exists.
Testcases:
* Ran pre-review-test
* Unit Tests added to tmp-file-mgr-test/disk-io-mgr-test.
* E2E Tests added to custom_cluster/test_scratch_disk.py.
* Ran Unit Tests:
$IMPALA_HOME/be/build/debug/runtime/buffered-tuple-stream-test
$IMPALA_HOME/be/build/debug/runtime/tmp-file-mgr-test
$IMPALA_HOME/be/build/debug/runtime/bufferpool/buffer-pool-test
$IMPALA_HOME/be/build/debug/runtime/io/disk-io-mgr-test
* Ran E2E Tests:
custom_cluster/test_scratch_disk.py
Change-Id: I419b1d5dbbfe35334d9f964c4b65e553579fdc89
---
M be/src/runtime/hdfs-fs-cache.cc
M be/src/runtime/hdfs-fs-cache.h
M be/src/runtime/io/CMakeLists.txt
A be/src/runtime/io/disk-file.cc
A be/src/runtime/io/disk-file.h
M be/src/runtime/io/disk-io-mgr-test.cc
M be/src/runtime/io/disk-io-mgr.cc
M be/src/runtime/io/disk-io-mgr.h
A be/src/runtime/io/file-writer.h
M be/src/runtime/io/local-file-system.cc
M be/src/runtime/io/local-file-system.h
A be/src/runtime/io/local-file-writer.cc
A be/src/runtime/io/local-file-writer.h
M be/src/runtime/io/request-context.cc
M be/src/runtime/io/request-context.h
M be/src/runtime/io/request-ranges.h
M be/src/runtime/io/scan-range.cc
M be/src/runtime/query-state.cc
M be/src/runtime/tmp-file-mgr-internal.h
M be/src/runtime/tmp-file-mgr-test.cc
M be/src/runtime/tmp-file-mgr.cc
M be/src/runtime/tmp-file-mgr.h
M be/src/util/hdfs-util.cc
M be/src/util/hdfs-util.h
M common/thrift/metrics.json
M tests/custom_cluster/test_scratch_disk.py
26 files changed, 4,121 insertions(+), 266 deletions(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/18/16318/23
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I419b1d5dbbfe35334d9f964c4b65e553579fdc89
Gerrit-Change-Number: 16318
Gerrit-PatchSet: 23
Gerrit-Owner: Yida Wu <wy...@gmail.com>
Gerrit-Reviewer: Abhishek Rawat <ar...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Sahil Takiar <st...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>
Gerrit-Reviewer: Yida Wu <wy...@gmail.com>