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https://issues.apache.org/jira/browse/IOTDB-527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jialin Qiao closed IOTDB-527.
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    Resolution: Fixed

> SeriesReader bug when mergeReader has data and overlappedPageReaders isEmpty
> ----------------------------------------------------------------------------
>
>                 Key: IOTDB-527
>                 URL: https://issues.apache.org/jira/browse/IOTDB-527
>             Project: Apache IoTDB
>          Issue Type: Bug
>          Components: Core/Engine
>            Reporter: DaweiLiu
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 0.10.0-SNAPSHOT
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> In the SeriesReader, we use the mergeReader to read to the end of the 
> directly overlapped page (assumed time is A) when the data overlaps, and fill 
> in the pages that overlap again as we read.
> 在SeriesReader中,当数据发生相交时我们会使用mergeReader读到直接重叠的page结尾(A时间点),同时会在读的过程中不断填充再次相交的page。
> When the time in mergeReader is greater than the time A, the loop ends and A 
> batchData is cut. The problem is, we don't know how many chunks are filled 
> in, so when you reenter using hasNextPage(), the chunk referred to in 
> firstChunkMetaData is the wrong chunk, causing the data to be re-read.
> 当mergeReader中的时间点大于A时间点时,会结束循环,切分开一个batchData。但问题是,我们并不知道中间Fill了多少chunk,所以当使用hasNextPage()重入的时候,firstChunkMetaData
>  所指的chunk就是错误的,它会导致数据重读。
>  
> It looks something like this:
> 1  [1537401604557-1537984270773]
> 2 [1537401786489-1538006396048]



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