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JNI: Do not create 8M block cache for negative blockCacheSize values (#5465)

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Summary:
As [BlockBasedTableConfig setBlockCacheSize()](1966a7c055/java/src/main/java/org/rocksdb/BlockBasedTableConfig.java (L728)) said, If cacheSize is non-positive, then cache will not be used. but when we configure a negative number or 0, there is an unexpected result: the block cache becomes 8M.

- Allow 0 as a valid size. When block cache size is 0, an 8MB block cache is created, as it is the default C++ API behavior. Also updated the comment.
- Set no_block_cache true if negative value is passed to block cache size, and no block cache will be created.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5465

Differential Revision: D15968788

Pulled By: sagar0

fbshipit-source-id: ee02d6e95841c9e2c316a64bfdf192d46ff5638a
This commit is contained in:
Jermy Li 2019-06-24 11:32:45 -07:00 committed by Facebook Github Bot
parent 68980df89c
commit c92c58f84d
2 changed files with 5 additions and 2 deletions
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5
java/rocksjni/table.cc
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@ -85,7 +85,7 @@ jlong Java_org_rocksdb_BlockBasedTableConfig_newTableFactoryHandle(
std::shared_ptr<rocksdb::Cache> *pCache =
reinterpret_cast<std::shared_ptr<rocksdb::Cache> *>(jblock_cache_handle);
options.block_cache = *pCache;
} else if (jblock_cache_size > 0) {
} else if (jblock_cache_size >= 0) {
if (jblock_cache_num_shard_bits > 0) {
options.block_cache = rocksdb::NewLRUCache(
static_cast<size_t>(jblock_cache_size),
@ -94,6 +94,9 @@ jlong Java_org_rocksdb_BlockBasedTableConfig_newTableFactoryHandle(
options.block_cache = rocksdb::NewLRUCache(
static_cast<size_t>(jblock_cache_size));
}
} else {
options.no_block_cache = true;
options.block_cache = nullptr;
}
}
if (jpersistent_cache_handle > 0) {

2
java/src/main/java/org/rocksdb/BlockBasedTableConfig.java
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@ -725,7 +725,7 @@ public class BlockBasedTableConfig extends TableFormatConfig {
/**
* Set the size of the cache in bytes that will be used by RocksDB.
* If cacheSize is non-positive, then cache will not be used.
* If cacheSize is negative, then cache will not be used.
* DEFAULT: 8M
*
* @param blockCacheSize block cache size in bytes