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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10461) Erasure Coding: Optimize block checksum recalculation logic on the fly by reconstructing multiple missed blocks at a time
Date Thu, 19 Jan 2017 00:17:26 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andrew Wang updated HDFS-10461:
-------------------------------
    Parent Issue: HDFS-8425  (was: HDFS-8031)

> Erasure Coding: Optimize block checksum recalculation logic on the fly by reconstructing
multiple missed blocks at a time
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10461
>                 URL: https://issues.apache.org/jira/browse/HDFS-10461
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>
> This is HDFS-9833 follow-on task. HDFS-9833 is recomputing only one block checksum a
time. The reconstruction logic can be further optimized by reconstructing multiple blocks
at a time.
> There are several case to be considered like, 
> case-1) Live Block indices : {{0, 4, 5, 6, 7, 8}} - consecutive missing data blocks 1,
2, 3
> case-2) Live Block indices : {{0, 2, 4, 6, 7, 8}} - jumbled missing data blocks 1, 3,
5



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