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From "Chia-Ping Tsai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-18966) Use non-sync TimeRangeTracker as a replacement for TimeRange in ImmutableSegment
Date Fri, 13 Oct 2017 09:58:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-18966?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chia-Ping Tsai updated HBASE-18966:
-----------------------------------
    Description: 
The in-memory compaction/merge updates only the {{TimeRangeTracker}} when creating new {{ImmutableSegment}},
but the time information used to do time filter is the {{TimeRange}} rather than {{TimeRangeTracker}}.
It don't cause any bugs currently because the {{TimeRange}} is used for store-level ts filter
only and the default {{TimeRange}} of {{ImmutableSegment}} created by in-memory compaction/merge
has the maximum ts range.  

The {{TimeRange}} was used to be a snapshot of {{TimeRangeTracker}} for avoiding the sync
operation happening in {{TimeRangeTracker}}. We can use non-sync trt introduced by HBASE-18753
to replace the {{TimeRange}}.

  was:
The in-memory compaction/merge do the great job of optimizing the memory layout for cells,
but they don't update its {{TimeRange}}. It don't cause any bugs currently because the {{TimeRange}}
is used for store-level ts filter only and the default {{TimeRange}} of {{ImmutableSegment}}
created by in-memory compaction/merge has the maximum ts range.  

The {{TimeRange}} is used to be a snapshot of {{TimeRangeTracker}} before for avoiding the
sync operation happening in {{TimeRangeTracker}}. HBASE-


> Use non-sync TimeRangeTracker as a replacement for TimeRange in ImmutableSegment
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-18966
>                 URL: https://issues.apache.org/jira/browse/HBASE-18966
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Chia-Ping Tsai
>            Assignee: Chia-Ping Tsai
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-18966.v0.patch, HBASE-18966.v1.patch, HBASE-18966.v2.patch,
HBASE-18966.v2.patch
>
>
> The in-memory compaction/merge updates only the {{TimeRangeTracker}} when creating new
{{ImmutableSegment}}, but the time information used to do time filter is the {{TimeRange}}
rather than {{TimeRangeTracker}}. It don't cause any bugs currently because the {{TimeRange}}
is used for store-level ts filter only and the default {{TimeRange}} of {{ImmutableSegment}}
created by in-memory compaction/merge has the maximum ts range.  
> The {{TimeRange}} was used to be a snapshot of {{TimeRangeTracker}} for avoiding the
sync operation happening in {{TimeRangeTracker}}. We can use non-sync trt introduced by HBASE-18753
to replace the {{TimeRange}}.



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