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I am using HBase. I have installed and have the distributed environment running now.
However, it shows a warning in HMaster’s interface page:
“You are currently running the HMaster without HDFS append support enabled. This may result in data loss”
How can I solve this? If I don’t use CDH3’s hadoop? Can someone give me very detailed instructions please?
Thanks!!!!
As you just found out you cannot (should not) use the standard Apache release of Hadoop 0.20.* with HBase as it is missing append support, HDFS-200. There is no official ASF Hadoop release that has append support. Cloudera’s release is the easiest way, can you elaborate on why you cannot use it? It is distributed with the same license as Apache, and if you use a tarball release it is similar to the Apache release and you don’t need special permission to install RPMs.
The other choices that I am aware of are rolling your own hadoop from the hadoop-append branch (not fun) and using MapR, which I have no first hand experience with.
For a while on the HBase mail lists some people have had luck replacing the hadoop jar in their hadoop install with the hadoop jar that gets distributed with HBase. That way does seem fraught with risk and not everyone is happy with it.