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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19427) Add TimeRange support into Append to optimize for counters
Date Tue, 12 Dec 2017 15:05:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16287721#comment-16287721
] 

Chia-Ping Tsai commented on HBASE-19427:
----------------------------------------

bq.  If we offer a TimeRange that does not include the last Append, then the Append will start
over overwriting what was there previous?
bq. so if timerange does not include last increment, the increment starts over?
An new cell will be added. The one diff between Append and Increment is that the zero value
of cell in append will reset the corresponding cell but increment doesn't. I had left the
comment for this diff when resolving HBASE-18546.
{code}
        case INCREMENT:
          mutationType = MutationType.INCREMENT;
          // If delta amount to apply is 0, don't write WAL or MemStore.
          long deltaAmount = getLongValue(delta);
          // TODO: Does zero value mean reset Cell? For example, the ttl.
          apply = deltaAmount != 0;
          final long newValue = currentValue == null ? deltaAmount : getLongValue(currentValue)
+ deltaAmount;
          newCell = reckonDelta(delta, currentValue, columnFamily, now, mutation, (oldCell)
-> Bytes.toBytes(newValue));
          break;
{code}

bq. Should we have this same facility in Increment and CheckAndMutate?
Yep, we can support the TimeRange for checkAndMutate. FYI [~psomogyi] (You do the great job
for checkAndMutate in HBASE-19213) 

> Add TimeRange support into Append to optimize for counters
> ----------------------------------------------------------
>
>                 Key: HBASE-19427
>                 URL: https://issues.apache.org/jira/browse/HBASE-19427
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-19427.v0.patch, HBASE-19427.v1.patch
>
>
> The time range in Increment is used to optimize the Get operation. This issue try to
port the feature from Increment to Append.



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