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From <Milind.Bhandar...@emc.com>
Subject Re: Add Append-HBase support in upcoming 20.205
Date Wed, 31 Aug 2011 22:07:14 GMT
FWIW, Stack has already done the work needed to make sure that Hbase works
with Hadoop 0.22 branch, and I suppose if
https://issues.apache.org/jira/browse/MAPREDUCE-2767 is committed, it
removes the last blocker from 0.22.0, so that it can be released.

I am cc'ng hbase-dev, since this is relevant to them as well.

- Milind

On 8/31/11 11:41 AM, "sanjay Radia" <sanjay@hortonworks.com> wrote:

>I propose that the 20-append patches (details below)  be included in
>20.205 which will become the first official Apache
>release of Hadoop that supports Append and HBase.
>There hasn't been a official Apache release that supports HBase.
>The HBase community have instead been using the 20-append branch; the
>patches were contributed by the HBase community including Facebook. The
>Cloudera distribution has also included these patches.
>Andrew Purtell has ported these patches to 20-security branch.
>Risk Level:
>These patches have been used and tested on large HBase clusters by FB ,
>by those who use 20-append branch directly (various users including a 500
>node HBase cluster at Yahoo) and by those that use the Cloudera
>distribution. We have reviewed the patches and have conducted further
>tests; testing and validation continues.
>HDFS-200. Support append and sync for hadoop 0.20 branch.
>HDFS-142. Blocks that are being written by a client are stored in the
>blocksBeingWritten directory.
>HDFS-1057.  Concurrent readers hit ChecksumExceptions if following a
>writer to very end of file
>HDFS-724.  Use a bidirectional heartbeat to detect stuck pipeline.
>HDFS-895. Allow hflush/sync to occur in parallel with new writes to the
>HDFS-1520. Lightweight NameNode operation recoverLease to trigger lease
>HDFS-1555. Disallow pipelien recovery if a file is already being lease
>HDFS-1554. New semantics for recoverLease.
>HDFS-988. Fix bug where savenameSpace can corrupt edits log.
>HDFS-826. Allow a mechanism for an application to detect that datanode(s)
>have died in the write pipeline.
>HDFS-630. Client can exclude specific nodes in the write pipeline.
>HDFS-1141. completeFile does not check lease ownership.
>HDFS-1204. Lease expiration should recover single files, not entire lease
>HDFS-1254. Support append/sync via the default configuration.
>HDFS-1346. DFSClient receives out of order packet ack.
>HDFS-1054. remove sleep before retry for allocating a block.

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