Thanks everyone who has participated in this discussion. With 7 +1's (5 binding and 2 non-binding), and no -1, this vote has passed. I will do a final 'git merge' with trunk and work with Andrew to merge the branch to trunk. I'll update on this thread when the merge is done.
--- Zhe Zhang On Thu, Sep 24, 2015 at 11:08 PM, Liu, Yi A <yi.a....@intel.com> wrote: > (Change it to binding.) > > +1 > I have been involved in the development and code review on the feature > branch. It's a great feature and I think it's ready to merge it into trunk. > > Thanks all for the contribution. > > Regards, > Yi Liu > > > -----Original Message----- > From: Liu, Yi A > Sent: Friday, September 25, 2015 1:51 PM > To: hdfs-dev@hadoop.apache.org > Subject: RE: [VOTE] Merge HDFS-7285 (erasure coding) branch to trunk > > +1 (non-binding) > I have been involved in the development and code review on the feature > branch. It's a great feature and I think it's ready to merge it into trunk. > > Thanks all for the contribution. > > Regards, > Yi Liu > > > -----Original Message----- > From: Vinayakumar B [mailto:vinayakum...@apache.org] > Sent: Friday, September 25, 2015 12:21 PM > To: hdfs-dev@hadoop.apache.org > Subject: Re: [VOTE] Merge HDFS-7285 (erasure coding) branch to trunk > > +1, > > I've been involved starting from design and development of ErasureCoding. > I think phase 1 of this development is ready to be merged to trunk. > It had come a long way to the current state with significant effort of > many Contributors and Reviewers for both design and code. > > Thanks Everyone for the efforts. > > Regards, > Vinay > > On Wed, Sep 23, 2015 at 10:53 PM, Jing Zhao <ji...@apache.org> wrote: > > > +1 > > > > I've been involved in both development and review on the branch, and I > > believe it's now ready to get merged into trunk. Many thanks to all > > the contributors and reviewers! > > > > Thanks, > > -Jing > > > > On Tue, Sep 22, 2015 at 6:17 PM, Zheng, Kai <kai.zh...@intel.com> wrote: > > > > > Non-binding +1 > > > > > > According to our extensive performance tests, striping + ISA-L coder > > based > > > erasure coding not only can save storage, but also can increase the > > > throughput of a client or a cluster. It will be a great addition to > > > HDFS and its users. Based on the latest branch codes, we also > > > observed it's > > very > > > reliable in the concurrent tests. We'll provide the perf test report > > after > > > it's sorted out and hope it helps. > > > Thanks! > > > > > > Regards, > > > Kai > > > > > > -----Original Message----- > > > From: Gangumalla, Uma [mailto:uma.ganguma...@intel.com] > > > Sent: Wednesday, September 23, 2015 8:50 AM > > > To: hdfs-dev@hadoop.apache.org; common-...@hadoop.apache.org > > > Subject: Re: [VOTE] Merge HDFS-7285 (erasure coding) branch to trunk > > > > > > +1 > > > > > > Great addition to HDFS. Thanks all contributors for the nice work. > > > > > > Regards, > > > Uma > > > > > > On 9/22/15, 3:40 PM, "Zhe Zhang" <zhezh...@cloudera.com> wrote: > > > > > > >Hi, > > > > > > > >I'd like to propose a vote to merge the HDFS-7285 feature branch > > > >back to trunk. Since November 2014 we have been designing and > > > >developing this feature under the umbrella JIRAs HDFS-7285 and > > > >HADOOP-11264, and have committed approximately 210 patches. > > > > > > > >The HDFS-7285 feature branch was created to support the first phase > > > >of HDFS erasure coding (HDFS-EC). The objective of HDFS-EC is to > > > >significantly reduce storage space usage in HDFS clusters. Instead > > > >of always creating 3 replicas of each block with 200% storage space > > > >overhead, HDFS-EC provides data durability through parity data blocks. > > > >With most EC configurations, the storage overhead is no more than 50%. > > > >Based on profiling results of production clusters, we decided to > > > >support EC with the striped block layout in the first phase, so > > > >that small files can be better handled. This means dividing each > > > >logical HDFS file block into smaller units (striping cells) and > > > >spreading them on a set of DataNodes in round-robin fashion. Parity > > > >cells are generated for each stripe of original data cells. We have > > > >made changes to NameNode, client, and DataNode to generalize the > > > >block concept and handle the mapping between a logical file block > > > >and its internal storage blocks. For further details please see the > > > >design doc on HDFS-7285. > > > >HADOOP-11264 focuses on providing flexible and high-performance > > > >codec calculation support. > > > > > > > >The nightly Jenkins job of the branch has reported several > > > >successful runs, and doesn't show new flaky tests compared with > > > >trunk. We have posted several versions of the test plan including > > > >both unit testing and cluster testing, and have executed most tests > > > >in the plan. The most basic functionalities have been extensively > > > >tested and verified in several real clusters with different > > > >hardware configurations; results have been very stable. We have > > > >created follow-on tasks for more advanced error handling and > optimization under the umbrella HDFS-8031. > > > >We also plan to implement or harden the integration of EC with > > > >existing features such as WebHDFS, snapshot, append, truncate, > > > >hflush, hsync, and so forth. > > > > > > > >Development of this feature has been a collaboration across many > > > >companies and institutions. I'd like to thank J. Andreina, Takanobu > > > >Asanuma, Vinayakumar B, Li Bo, Takuya Fukudome, Uma Maheswara Rao > > > >G, Rui Li, Yi Liu, Colin McCabe, Xinwei Qin, Rakesh R, Gao Rui, Kai > > > >Sasaki, Walter Su, Tsz Wo Nicholas Sze, Andrew Wang, Yong Zhang, > > > >Jing Zhao, Hui Zheng and Kai Zheng for their code contributions and > reviews. > > > >Andrew and Kai Zheng also made fundamental contributions to the > > > >initial design. Rui Li, Gao Rui, Kai Sasaki, Kai Zheng and many > > > >other contributors have made great efforts in system testing. Many > > > >thanks go to Weihua Jiang for proposing the JIRA, and ATM, Todd > > > >Lipcon, Silvius Rus, Suresh, as well as many others for providing > helpful feedbacks. > > > > > > > >Following the community convention, this vote will last for 7 days > > > >(ending September 29th). Votes from Hadoop committers are binding > > > >but non-binding votes are very welcome as well. And here's my > > > >non-binding > > +1. > > > > > > > >Thanks, > > > >--- > > > >Zhe Zhang > > > > > > > > >
