Hi, Thanks Vinay for bring this up, I am a member of "Openlab" community mentioned by Vinay. I am working on building and testing Hadoop components on aarch64 server these days, besides the missing dependices of ARM platform issues #1 #2 #3 mentioned by Vinay, other similar issue has also be found, such as the "PhantomJS" dependent package also missing for aarch64.
To promote the ARM support for Hadoop, we have discussed and hoped to add an ARM specific CI to Hadoop repo. we are not sure about if there is any potential effect or confilict on the trunk branch, so maybe creating a ARM specific branch for doing these stuff is a better choice, what do you think? Hope to hear thoughts from you :) BR, Liu sheng Vinayakumar B <vinayakum...@apache.org> 于2019年8月27日周二 上午5:34写道： > Hi Folks, > > ARM is becoming famous lately in its processing capability and has got the > potential to run Bigdata workloads. > Many users have been moving to ARM machines due to its low cost. > > In the past there were attempts to compile Hadoop on ARM (Rasberry PI) for > experimental purposes. Today ARM architecture is taking some of the > serverside processing as well. So there will be/is a real need of Hadoop to > support ARM architecture as well. > > There are bunch of users who are trying out building Hadoop on ARM, trying > to add ARM CI to hadoop and facing issues[1]. Also some > > As of today, Hadoop does not compile on ARM due to below issues, found from > testing done in openlab in [2]. > > 1. Protobuf : > ------------------- > Hadoop project (also some downstream projects) stuck to protobuf 2.5.0 > version, due to backward compatibility reasons. Protobuf-2.5.0 is not being > maintained in the community. While protobuf 3.x is being actively adopted > widely, still protobuf 3.x provides wire compatibility for proto2 messages. > Due to some compilation issues in the generated java code, which can induce > problems in downstream. Due to this reason protobuf upgrade from 2.5.0 was > not taken up. > In 3.0.0 onwards, hadoop supports shading of libraries to avoid classpath > problem in downstream projects. > There are patches available to fix compilation in Hadoop. But need to > find a way to upgrade protobuf to latest version and still maintain the > downstream's classpath using shading feature of Hadoop build. > > There is a Jira for protobuf upgrade[3] created even before shade > support was added to Hadoop. Now need to revisit the Jira and continue > explore possibilities. > > 2. leveldbjni: > --------------- > Current leveldbjni used in YARN doesnot support ARM architecture, need > to check whether any of the future versions support ARM and can hadoop > upgrade to that version. > > > 3. hadoop-yarn-csi's dependency 'protoc-gen-grpc-java:1.15.1' > ------------------------- > 'protoc-gen-grpc-java:1.15.1' does not provide ARM executable by default in > the maven repository. Workaround is to build it locally and keep in local > maven repository. > Need to check whether any future versions of 'protoc-gen-grpc-java' is > having ARM executable and whether hadoop-yarn-csi can upgrade it? > > > Once the compilation issues are solved, then there might be many native > code related issues due to different architectures. > So to explore everything, need to join hands together and proceed. > > > Let us discuss and check, whether any body else out there who also need the > support of Hadoop on ARM architectures and ready to lend their hands and > time in this work. > > > [1] https://issues.apache.org/jira/browse/HADOOP-16358 > [2] > > https://issues.apache.org/jira/browse/HADOOP-16358?focusedCommentId=16904887&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16904887 > [3] https://issues.apache.org/jira/browse/HADOOP-13363 > > -Vinay >
