[
https://issues.apache.org/jira/browse/HBASE-7721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13572169#comment-13572169
]
Ted Yu commented on HBASE-7721:
-------------------------------
Went through half of the patch.
Locally I got this failure:
{code}
testShutdownSimpleFixup(org.apache.hadoop.hbase.regionserver.TestSplitTransactionOnCluster)
Time elapsed: 63.304 sec <<< FAILURE!
java.lang.AssertionError: Waiting too long for daughter regions
at org.junit.Assert.fail(Assert.java:88)
at
org.apache.hadoop.hbase.regionserver.TestSplitTransactionOnCluster.awaitDaughters(TestSplitTransactionOnCluster.java:955)
at
org.apache.hadoop.hbase.regionserver.TestSplitTransactionOnCluster.testShutdownSimpleFixup(TestSplitTransactionOnCluster.java:374)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
{code}
> Local Transactions in META
> --------------------------
>
> Key: HBASE-7721
> URL: https://issues.apache.org/jira/browse/HBASE-7721
> Project: HBase
> Issue Type: Improvement
> Components: Coprocessors, regionserver
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 0.96.0
>
>
> Thanks to Lars' local transactions patch (HBASE-5229), we can entertain the
> possibility of doing local transactions within META regions.
> We need this mainly for region splits and merges. Clients scan the META
> concurrent to the split/merge operations, and to prevent the clients from
> seeing overlapping region boundaries or holes in META, we just through hoops.
> For more backgroun, see BlockingMetaScannerVisitor, HBASE-5986, and my
> comments at https://reviews.apache.org/r/8716/.
> Now, for the actual implementation options:
> 1. As outlined in http://hadoop-hbase.blogspot.com/2012_02_01_archive.html,
> - We have to implement a Custom RegionSplitPolicy for the META regions to
> ensure that a table's regions are always co-located in the same META region.
> Then we can add MultiRowMutationEndpoint as a system level coprocessor, and
> use it for META operations.
> 2. Do smt like HBASE-7716, and expose local atomic multi-row operations as a
> native API.
> 3. Move META to zookeeper. Use zookeeper.multi.
> Then we can change region split / merge logic to make use of atomic META
> operations.
> Thoughts, suggestions?
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
