[fileio] Add file-io.allow-cache for RESTTokenFileIO#5054
[fileio] Add file-io.allow-cache for RESTTokenFileIO#5054JingsongLi merged 6 commits intoapache:masterfrom
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| <td><h5>resolving-file-io.enabled</h5></td> | ||
| <td style="word-wrap: break-word;">false</td> | ||
| <td>Boolean</td> | ||
| <td>Whether to enable resolving fileio, when this option is enabled, in conjunction with the table's property data-file.external-paths, Paimon can read and write to external storage paths, such as OSS or S3. In order to access these external paths correctly, you also need to configure the corresponding access key and secret key.</td> |
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fileio -> file io same with line 87?
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it is ok in description, we can just be careful for option key, it is API part.
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| @Override | ||
| public void close() { | ||
| if (!allowCache) { |
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This means, if allowCache, the fileIo need to close by outside?
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if not allow cache, the fileio should be closed.
If allow cache, the fileio is in the static cache, we cannot close them.
| <td><h5>file-io.allow-cache</h5></td> | ||
| <td style="word-wrap: break-word;">true</td> | ||
| <td>Boolean</td> | ||
| <td>Whether to allow static cache in file io implementation. If not allowed, this means that there may be a large number of FileIO instances generated, enabling caching can lead to resource leakage.</td> |
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I have a question here:
If enabling caching, the number of FileIO instances will be reduce. Why enabling caching can lead to resource leakage?
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Our original design was to place it in the cache of static variables, but for the case of REST Catalog, it may have a lot of FileIO generated, and there may be a FileIO for each table because each table has different file access permissions.
So if there are too many FileIOs in this situation, we cannot cache them in memory casually. If there are too many, it will lead to too many resources, that is, resource leakage.
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LGTM |
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Purpose
HadoopCompliantFileIO, it should useMap.computeIfAbsent.new Configuration(false)to not load files in configuration for improving performance.Tests
API and Format
Documentation