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https://issues.apache.org/jira/browse/HBASE-17738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16005025#comment-16005025
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Chia-Ping Tsai commented on HBASE-17738:
----------------------------------------
{code}
+ List<Future<ByteBuffer>> futures = new
ArrayList<Future<ByteBuffer>>(bufferCount - 1);
+ for (int i = 0; i <= bufferCount; i++) {
+ if (i < bufferCount) {
+ futures.add(
+ service.submit(new BufferCreatorCallable(allocator, bufferSize,
directByteBuffer)));
+ } else {
+ // always create on heap
+ buffers[i] = ByteBuffer.allocate(0);
+ }
+ }
{code}
The initial capacity of futures should be equal with bufferCount rather than
"bufferCount - 1"
> BucketCache startup is slow
> ---------------------------
>
> Key: HBASE-17738
> URL: https://issues.apache.org/jira/browse/HBASE-17738
> Project: HBase
> Issue Type: Sub-task
> Components: BucketCache
> Affects Versions: 2.0.0
> Reporter: stack
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0
>
> Attachments: HBASE-17738_2.patch, HBASE-17738_2.patch,
> HBASE-17738.patch
>
>
> If you set bucketcache size at 64G say and then start hbase, it takes a long
> time. Can we do the allocations in parallel and not inline with the server
> startup?
> Related, prefetching on a bucketcache is slow. Speed it up.
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