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Apache HBase

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### Description of PR https://issues.apache.org/jira/browse/HBASE-27989 This PR prohibits setting `hbase.server.allocator.buffer.size` to 0 or negative. A warning is also added if the minimum size for reservoir use is set to zero....

### Description of PR https://issues.apache.org/jira/browse/HBASE-27990 This PR adds a precheck for `hbase.blockcache.minblocksize` such that it must be positive. ### How was this patch tested? (1) set hbase.blockcache.minblocksize=0 (2) run org.apache.hadoop.hbase.io.hfile.TestCacheConfig#testBucketCacheConfigL1L2Setup...

Details see: [HBASE-28091](https://issues.apache.org/jira/browse/HBASE-28091)

See [HBase-28014](https://issues.apache.org/jira/browse/HBase-28014) for details on the symptom and diagnostic. The fix of [HBase-28014](https://issues.apache.org/jira/browse/HBase-28014) is implemented. In my local machine, it is able to pass all test cases. I add some...

Basically, we add a unit test for reproducing the FileNotFoundException encountered in SplitLogWorker.java in case [HBase-20583]. Here is the workflow of reproducing that. First of all, the WAL file directory...

…thing except ThreadPoolExecutor - This is just a UT patch to demonstrate HBASE-28035. Please do not merge!

Enable PE to load any custom implementation of tests at runtime