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Posted to oak-issues@jackrabbit.apache.org by "Yu-An Lin (Jira)" <ji...@apache.org> on 2022/04/26 17:52:00 UTC

[jira] [Created] (OAK-9754) Increase default dump threshold for multithreaded download

Yu-An Lin created OAK-9754:
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             Summary: Increase default dump threshold for multithreaded download
                 Key: OAK-9754
                 URL: https://issues.apache.org/jira/browse/OAK-9754
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: indexing
            Reporter: Yu-An Lin


Looking at the detailed log output of indexing job using Oak with Multi-Threaded Download Strategy, lots of small files are being created because we have a low dump threshold of 1MB per file. [https://github.com/apache/jackrabbit-oak/blob/trunk/oak-run-commons/src/main/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/FlatFileNodeStoreBuilder.java#L91] 

We should increase the threshold if possible to even larger to 16 MB instead, that way we have 16 MB, with 8 threads that is 128 MB. This would (hopefully) reduce the number of files from 22'972 to 1'435, which is more more reasonable. Also, I don't think it would bring any risk of out-of-memory.



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