anoopsjohn commented on pull request #3473:
URL: https://github.com/apache/hbase/pull/3473#issuecomment-878772448
>In the master branch, in ComebinedBlockCache getBlock method, it will check
if the block is metablock or not and check it in L1 or L2. This will make the
metric work normal.
There is one thing to note
In master branch also we have,
public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching, boolean
repeat,
boolean updateCacheMetrics, BlockType blockType) {
if (blockType == null) {
return getBlock(cacheKey, caching, repeat, updateCacheMetrics);
}
boolean metaBlock = isMetaBlock(blockType);
if (metaBlock) {
return l1Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
} else {
return l2Cache.getBlock(cacheKey, caching, repeat, updateCacheMetrics);
}
}
In some code paths, we dont pass a blockType. It will come as null. That
time we follow the old method of check for key in cache and call get.
For those flow, the type in BlockCacheKey will also be null. We may have
to consider that.
So we can think about another way around? Can we think about
containsBlock() deal with metric too? Need to be careful though. Even in
master, the metric what we get is not accurate. It may be better than 0% miss
rate. But not correct
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