[
https://issues.apache.org/jira/browse/HDFS-10904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Anu Engineer resolved HDFS-10904.
---------------------------------
Resolution: Not A Problem
> Need a new Result state for DiskBalancerWorkStatus to indicate the final Plan
> step errors and stuck rebalancing
> ---------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-10904
> URL: https://issues.apache.org/jira/browse/HDFS-10904
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: balancer & mover
> Affects Versions: 3.0.0-alpha2
> Reporter: Manoj Govindassamy
> Assignee: Manoj Govindassamy
> Fix For: 2.9.0
>
>
> * A DiskBalancer {{NodePlan}} might include a Single {{MoveStep}} or a list
> of MoveSteps to perform the requested disk balancing operation.
> * {{DiskBalancerWorkStatus}} tracks the current disk balancing operation
> status for the {{Plan}} just submitted.
> * {{DiskBalancerWorkStatus#Result}} has following states and the state
> machine movement for the {{currentResult}} state doesn't seem to be a driven
> totally from disk balancing operation. Especially, the state movement to DONE
> is happening only upon QueryResult, which can be improved. {code}
> /** Various result values. **/
> public enum Result {
> NO_PLAN(0),
> PLAN_UNDER_PROGRESS(1),
> PLAN_DONE(2),
> PLAN_CANCELLED(3);
> DiskBalancer
> cancelPlan(String)
> this.currentResult = Result.PLAN_CANCELLED;
> DiskBalancer(String, Configuration, BlockMover)
> this.currentResult = Result.NO_PLAN;
> queryWorkStatus()
> this.currentResult = Result.PLAN_DONE;
> shutdown()
> this.currentResult = Result.NO_PLAN;
> this.currentResult = Result.PLAN_CANCELLED;
> submitPlan(String, long, String, String, boolean)
> this.currentResult = Result.PLAN_UNDER_PROGRESS;
> {code}
> * More importantly, when the final {{MoveStep}} of the {{NodePlan}} fails,
> the currentResult state is stuck in {{PLAN_UNDER_PROGRESS}} forever. User
> querying the status will assume the operation is in progress when in reality
> its not making any progress. User can also run {{Query}} command with
> _verbose_ option which then will display more details about the operation
> which includes details about errors encountered.
> ** Query Output: {code}
> Plan File: <_file_path_>
> Plan ID: <_plan_hash_>
> Result: PLAN_UNDER_PROGRESS
> {code}
> ** {code}
> "sourcePath" : "/data/disk2/hdfs/dn",
> "destPath" : "/data/disk3/hdfs/dn",
> "workItem" :
> .. .. ..
> "errorCount" : 0,
> "errMsg" : null,
> .. ..
> "maxDiskErrors" : 5,
> .. .. ..
> {code}
> ** But, user has to decipher these details to make out that the disk
> balancing operation is stuck as the top level Result still says
> {{PLAN_UNDER_PROGRESS}}. So, we want the DiskBalancer differentiate between
> the in-progress operation and the stuck or final error operations.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-dev-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-dev-h...@hadoop.apache.org
