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From "ChiaPing Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-16992) The usage of mutation from CP is weird.
Date Fri, 04 Nov 2016 19:07:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-16992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ChiaPing Tsai updated HBASE-16992:
----------------------------------
    Attachment: HBASE-16992.branch-1.v0.patch

branch-1.v0.patch has the changes outlined below.
# remove the recordMutationWithoutWal() which record the mutation from CP
# Add comment for RegionObserver#preBatchMutate

> The usage of mutation from CP is weird.
> ---------------------------------------
>
>                 Key: HBASE-16992
>                 URL: https://issues.apache.org/jira/browse/HBASE-16992
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 1.3.0, 1.4.0
>            Reporter: ChiaPing Tsai
>            Priority: Minor
>             Fix For: 2.0.0, 1.4.0, 1.3.1
>
>         Attachments: HBASE-16992.branch-1.v0.patch
>
>
> {code:title=HRegion#doMiniBatchMutate|borderStyle=solid}
> Mutation cpMutation = cpMutations[j];
> Map<byte[], List<Cell>> cpFamilyMap = cpMutation.getFamilyCellMap();
> checkAndPrepareMutation(cpMutation, replay, cpFamilyMap, now);
>  // Acquire row locks. If not, the whole batch will fail.
> acquiredRowLocks.add(getRowLockInternal(cpMutation.getRow(), true));
> if (cpMutation.getDurability() == Durability.SKIP_WAL) {
>   recordMutationWithoutWal(cpFamilyMap);
> }
> // Returned mutations from coprocessor correspond to the Mutation at index i. We can
>  // directly add the cells from those mutations to the familyMaps of this mutation.
> mergeFamilyMaps(familyMaps[i], cpFamilyMap); // will get added to the memstore later
> {code}
> 1. Does the returned mutation from coprocessor have the same row as the corresponded
mutation? If so, the acquiredRowLocks() can be saved. If not, the corresponded mutation may
maintain the cells with different row due to mergeFamilyMaps().
> 2. Is returned mutation's durability useful? If so, we should deal with the different
durabilities before mergeFamilyMaps(). If not, the recordMutationWithoutWal can be saved.

> 3. If both the returned mutation and corresponded mutation have Durability.SKIP_WAL,
the recordMutationWithoutWal() may record the duplicate cells due to mergeFamilyMaps().
> Any comment? Thanks.



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