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https://issues.apache.org/jira/browse/HBASE-4344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13112708#comment-13112708
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Ted Yu commented on HBASE-4344:
-------------------------------
This is the error for testRollback based on patch v5:
{code}
testRollback(org.apache.hadoop.hbase.regionserver.TestSplitTransaction) Time
elapsed: 1.166 sec <<< ERROR!
java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at
org.apache.hadoop.hbase.regionserver.MemStore.maybeCloneWithAllocator(MemStore.java:246)
at org.apache.hadoop.hbase.regionserver.MemStore.add(MemStore.java:213)
at org.apache.hadoop.hbase.regionserver.Store.add(Store.java:312)
at
org.apache.hadoop.hbase.regionserver.HRegion.applyFamilyMapToMemstore(HRegion.java:2079)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:2041)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1572)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1521)
at
org.apache.hadoop.hbase.HBaseTestingUtility.loadRegion(HBaseTestingUtility.java:834)
at
org.apache.hadoop.hbase.regionserver.TestSplitTransaction.testRollback(TestSplitTransaction.java:213)
{code}
> Persist memstoreTS to disk
> --------------------------
>
> Key: HBASE-4344
> URL: https://issues.apache.org/jira/browse/HBASE-4344
> Project: HBase
> Issue Type: Sub-task
> Reporter: Amitanand Aiyer
> Assignee: Amitanand Aiyer
> Fix For: 0.89.20100924
>
> Attachments: 4344-v2.txt, 4344-v4.txt, 4344-v5.txt, patch-2
>
>
> Atomicity can be achieved in two ways -- (i) by using a multiversion
> concurrency system (MVCC), or (ii) by ensuring that "new" writes do not
> complete, until the "old" reads complete.
> Currently, Memstore uses something along the lines of MVCC (called RWCC for
> read-write-consistency-control). But, this mechanism is not incorporated for
> the key-values written to the disk, as they do not include the memstore TS.
> Let us make the two approaches be similar, by persisting the memstoreTS along
> with the key-value when it is written to the disk.
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