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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7546) Obtain a table read lock on region split operations
Date Tue, 19 Mar 2013 22:57:16 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7546?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Enis Soztutar updated HBASE-7546:

    Attachment: hbase-7546_v5.patch

Attaching a rebased patch. I wanted to test this one more time to make sure, which was why
I did not commit it for some time. 

Quoting from the updated design doc attached at HBASE-7403: 

Unit tests
Tests the pure zk lock implementation. 
public void testAlterAndDisable() throws Exception {
    // Send a request to alter a table, then sleep during
    // the alteration phase. In the mean time, from another
    // thread, send a request to disable, and then delete a table.
 public void testTableReadLock() throws Exception {
   // test plan: write some data to the table. Continuously alter the table and
   // force splits
   // concurrently until we have 10 regions. verify the data just in case.
   // Every region should contain the same table descriptor
   // This is not an exact test
Sytem tests

Manual tests in 4 node cluster with 10MB flush and split size, and altering table constantly.
#regions started with 20 and ended with ~160. The load is created with LoadTestTool.

On 5 node cluster, with 100MB flush size and split size, I tested the patch for HBASE-7403
and HBASE-7546 with IntegrationTestBigLinkedList and ChaosMonkey. A total of 125M rows was
inserted and verified without any problems. The number of regions went from 1 to several hundred.
I also did 1 or 2 alter tables manually. 

I think Stack already +1'd v3 (this is just a rebase). I will commit if hadoopqa passes, and
no objections of course. 

> Obtain a table read lock on region split operations
> ---------------------------------------------------
>                 Key: HBASE-7546
>                 URL: https://issues.apache.org/jira/browse/HBASE-7546
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 0.95.0
>         Attachments: hbase-7546_v1.patch, hbase-7546_v2.patch, hbase-7546_v3.patch, hbase-7546_v5.patch
> As discussed in the parent issue HBASE-7305, we should be coordinating between splits
and table operations to ensure that they don't happen at the same time. In this issue we will
acquire shared read locks for region splits. 

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