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From "Yuanbo Liu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12283) Ozone: DeleteKey-5: Implement SCM DeletedBlockLog
Date Thu, 17 Aug 2017 11:42:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yuanbo Liu updated HDFS-12283:
------------------------------
    Attachment: HDFS-12283-HDFS-7240.003.patch

[~cheersyang] Thanks for your reminder. upload v3 patch

> Ozone: DeleteKey-5: Implement SCM DeletedBlockLog
> -------------------------------------------------
>
>                 Key: HDFS-12283
>                 URL: https://issues.apache.org/jira/browse/HDFS-12283
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone, scm
>            Reporter: Weiwei Yang
>            Assignee: Yuanbo Liu
>         Attachments: HDFS-12283.001.patch, HDFS-12283-HDFS-7240.001.patch, HDFS-12283-HDFS-7240.002.patch,
HDFS-12283-HDFS-7240.003.patch
>
>
> The DeletedBlockLog is a persisted log in SCM to keep tracking container blocks which
are under deletion. It maintains info about under-deletion container blocks that notified
by KSM, and the state how it is processed. We can use RocksDB to implement the 1st version
of the log, the schema looks like
> ||TxID||ContainerName||Block List||ProcessedCount||
> |0|c1|b1,b2,b3|0|
> |1|c2|b1|3|
> |2|c2|b2, b3|-1|
> Some explanations
> # TxID is an incremental long value transaction ID for ONE container and multiple blocks
> # Container name is the name of the container
> # Block list is a list of block IDs
> # ProcessedCount is the number of times SCM has sent this record to datanode, it represents
the "state" of the transaction, it is in range of \[-1, 5\], -1 means the transaction eventually
failed after some retries, 5 is the max number times of retries.
> We need to define {{DeletedBlockLog}} as an interface and implement this with RocksDB
{{MetadataStore}} as the first version.



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