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HBASE-8591 Doc Improvement: Replication blog 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1485068 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack 2013-05-22 05:38:16 +00:00
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commit 15d7ae0bc6
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src/main/site/xdoc/replication.xml
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@ -119,11 +119,9 @@
<p>
Synchronously, the region server that receives the edits reads them
sequentially and separates each of them into buffers, one per table.
Once all edits are read, each buffer is flushed using the normal HBase
client (HTables managed by a HTablePool). This is done in order to
leverage parallel insertion (MultiPut).
The master's cluster UUID is retained in the edits applied at the
slave cluster in order to allow cyclic replication.
Once all edits are read, each buffer is flushed using HTable, the normal
HBase client.The master's cluster UUID is retained in the edits applied at
the slave cluster in order to allow cyclic replication.
</p>
<p>
Back in the master cluster's region server, the offset for the current
@ -514,6 +512,19 @@
</pre>
</section>
</section>
<section name="Replication Metrics">
Following the some useful metrics which can be used to check the replication progress:
<ul>
<li><b>source.sizeOfLogQueue:</b> number of HLogs to process (excludes the one which is being
processed) at the Replication source</li>
<li><b>source.shippedOps:</b> number of mutations shipped</li>
<li><b>source.logEditsRead:</b> number of mutations read from HLogs at the replication source</li>
<li><b>source.ageOfLastShippedOp:</b> age of last batch that was shipped by the replication source</li>
</ul>
Please note that the above metrics are at the global level at this regionserver. In 0.95.0 and onwards, these
metrics are also exposed per peer level.
</section>
<section name="FAQ">
<section name="GLOBAL means replicate? Any provision to replicate only to cluster X and not to cluster Y? or is that for later?">
<p>
@ -534,18 +545,5 @@
</p>
</section>
</section>
<section name="Known bugs/missing features">
<p>
Here's a list of all the jiras that relate to major issues or missing
features in the replication implementation.
</p>
<ol>
<li>
HBASE-2611, basically if a region server dies while recovering the
queues of another dead RS, we will miss the data from the queues
that weren't copied.
</li>
</ol>
</section>
</body>
</document>