HBASE-21879 Read HFile ’s Block into ByteBuffer directly. 1. Background For reducing the Java GC impact to p99/p999 RPC latency, HBase 2.x has made an offheap read and write path. The KV are allocated BucketCache firstly, if the Cache misses, go to the HFile and read the corresponding block. The workflow: reading block from cache OR sending cells to client, is basically not involved in heap memory allocations that the process of reading the Block from HFile is still copied to the heap firstly, the heap block won’t free unless the WriterThread of BucketCache flushes the Block to offheap IOEngine successfully

validate transactions against endorsement policies and enforce the policies Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed immutability once a transaction is validated and committed A channel’s ledger contains a configuration block defining policies, access control lists, and other pertinent information Channel’s contain Membership verification of the correctness of a set of transactions comprising a block. Consensus is ultimately achieved when the order and results of a block’s transactions have met the explicit policy criteria checks.

validate transactions against endorsement policies and enforce the policies • Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed immutability once a transaction is validated and committed • A channel’s ledger contains a configuration block defining policies, access control lists, and other pertinent information • Channel’s contain Membership verification of the correctness of a set of transactions comprising a block. Consensus is ultimately achieved when the order and results of a block’s transactions have met the explicit policy criteria checks.

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin [https://en Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin [https://en Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin [https://en Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin [https://en Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin [https://en Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin cryptocurrency Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies • Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed

validated by a consensus protocol, grouped into blocks that include a hash that bind each block to the preceding block. The first and most widely recognized application of blockchain is the Bitcoin cryptocurrency Performance of a blockchain platform can be affected by many variables such as transaction size, block size, network size, as well as limits of the hardware, etc. The Hyperledger community is currently validate transactions against endorsement policies and enforce the policies • Prior to appending a block, a versioning check is performed to ensure that states for assets that were read have not changed