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chunhui shen commented on HBASE-7403: ------------------------------------- line longer than 100 is generated because of protobuf I will commit it tomorrow if no further more comments > Online Merge > ------------ > > Key: HBASE-7403 > URL: https://issues.apache.org/jira/browse/HBASE-7403 > Project: HBase > Issue Type: New Feature > Affects Versions: 0.95.0 > Reporter: chunhui shen > Assignee: chunhui shen > Priority: Critical > Fix For: 0.95.0, 0.98.0 > > Attachments: 7403-trunkv5.patch, 7403-trunkv6.patch, 7403v5.diff, > 7403-v5.txt, 7403v5.txt, hbase-7403-94v1.patch, hbase-7403-trunkv10.patch, > hbase-7403-trunkv11.patch, hbase-7403-trunkv12.patch, > hbase-7403-trunkv13.patch, hbase-7403-trunkv14.patch, > hbase-7403-trunkv15.patch, hbase-7403-trunkv16.patch, > hbase-7403-trunkv19.patch, hbase-7403-trunkv1.patch, > hbase-7403-trunkv20.patch, hbase-7403-trunkv22.patch, > hbase-7403-trunkv23.patch, hbase-7403-trunkv24.patch, > hbase-7403-trunkv26.patch, hbase-7403-trunkv28.patch, > hbase-7403-trunkv29.patch, hbase-7403-trunkv30.patch, > hbase-7403-trunkv31.patch, hbase-7403-trunkv32.patch, > hbase-7403-trunkv33.patch, hbase-7403-trunkv5.patch, > hbase-7403-trunkv6.patch, hbase-7403-trunkv7.patch, hbase-7403-trunkv8.patch, > hbase-7403-trunkv9.patch, merge region.pdf > > > Support executing region merge transaction on Regionserver, similar with > split transaction > Process of merging two regions: > a.client sends RPC (dispatch merging regions) to master > b.master moves the regions together (on the same regionserver where the more > heavily loaded region resided) > c.master sends RPC (merge regions) to this regionserver > d.Regionserver executes the region merge transaction in the thread pool > e.the above b,c,d run asynchronously > Process of region merge transaction: > a.Construct a new region merge transaction. > b.prepare for the merge transaction, the transaction will be canceled if it > is unavailable, > e.g. two regions don't belong to same table; two regions are not adjacent in > a non-compulsory merge; region is closed or has reference > c.execute the transaction as the following: > /** > * Set region as in transition, set it into MERGING state. > */ > SET_MERGING_IN_ZK, > /** > * We created the temporary merge data directory. > */ > CREATED_MERGE_DIR, > /** > * Closed the merging region A. > */ > CLOSED_REGION_A, > /** > * The merging region A has been taken out of the server's online regions > list. > */ > OFFLINED_REGION_A, > /** > * Closed the merging region B. > */ > CLOSED_REGION_B, > /** > * The merging region B has been taken out of the server's online regions > list. > */ > OFFLINED_REGION_B, > /** > * Started in on creation of the merged region. > */ > STARTED_MERGED_REGION_CREATION, > /** > * Point of no return. If we got here, then transaction is not recoverable > * other than by crashing out the regionserver. > */ > PONR > d.roll back if step c throws exception > Usage: > HBaseAdmin#mergeRegions > See more details from the patch -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira