GitHub user xuchuanyin opened a pull request:
https://github.com/apache/carbondata/pull/2689
[CARBONDATA-2851][CARBONDATA-2852] Support zstd as column compressor in
final store
1. add zstd compressor for compressing column data
2. add zstd support in thrift
3. since zstd does not support zero-copy while compressing, offheap will
not take effect for zstd
4. Column compressor is configured through system property and can be
changed in each load. Before loading, Carbondata will get the compressor and
use that compressor during that loading. During querying, carbondata will get
the compressor information from metadata in the file data.
5. Also support compressing streaming table using zstd. The compressor info
is stored in FileHeader of the streaming file.
6. This PR also considered and verified on the legacy store and compaction
A simple test with 1.2GB raw CSV data shows that the size (in MB) of final
store with different compressor:
| local dictionary | snappy | zstd | Size Reduced |
| --- | --- | --- | -- |
| enabled | 335 | 207 | 38.2% |
| disabled | 375 | 225 | 40% |
Be sure to do all of the following checklist to help us incorporate
your contribution quickly and easily:
- [x] Any interfaces changed?
`Yes, only internal used interfaces are changed`
- [x] Any backward compatibility impacted?
`Yes, backward compatibility is handled`
- [x] Document update required?
`Yes`
- [x] Testing done
Please provide details on
- Whether new unit test cases have been added or why no new tests
are required?
`Added tests`
- How it is tested? Please attach test report.
`Tested in local machine`
- Is it a performance related change? Please attach the performance
test report.
`The size of final store has been decreased by 40% compared with default
snappy`
- Any additional information to help reviewers in testing this
change.
`NA`
- [x] For large changes, please consider breaking it into sub-tasks under
an umbrella JIRA.
`NA`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/xuchuanyin/carbondata
0813_read_compressor_from_datafiles
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/carbondata/pull/2689.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2689
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commit d9539ccb832a73b2b6438d1c35fee1cc7aff8f5e
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-08-10T14:02:57Z
Support zstd as column compressor in final store
1. add zstd compressor for compressing column data
2. add zstd support in thrift
3. legacy store is not considered in this commit
4. since zstd does not support zero-copy while compressing, offheap will
not take effect for zstd
5. support lazy load for compressor
commit 3ef78a97c75f1514a84c6ae7b694c893eaef1eb7
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-08-13T13:45:42Z
Support new compressor on legacy store
In query procedure, we need to decompress the column page. Previously we
get the compressor from system property. Now since we support new
compressors, we should read the compressor information from the metadata
in datafiles.
This PR also solve the compatibility related problems on V1/V2 store where
we
only support snappy.
commit b5bafcb14aae0650c30d41537ea295c220693a04
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-08-14T08:38:00Z
fix comments
commit 2a270952a1fec1552bde78c30ec64154ccdd6327
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-08-23T09:35:23Z
Determine the column compressor before data loading
we will get the column compressor before data loading/compaction start,
so that it can make all the pages use the same compressor in case of
concurrent modifying compressor during loading.
commit 6a9c0b914de9c4b26405d2979b555dc0165f27b7
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-08-27T11:18:30Z
set compressor in carbon load model
column compressor is necessary for carbon load model, otherwise load
will fail.
commit 0934551c09f3d563d27a1bd91c70e8c62ea60527
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-08-30T04:02:33Z
fix error in test
commit 10ccff8d4a6c3d14aa5feef7251e1b155dc4d0c5
Author: xuchuanyin <xuchuanyin@...>
Date: 2018-09-03T03:58:02Z
fix review comments
optimize parameters for column page, use columnPageEncodeMeta instead of
its members
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