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https://issues.apache.org/jira/browse/HBASE-5713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13261097#comment-13261097
]
Zhihong Yu commented on HBASE-5713:
-----------------------------------
For SchemaChangeTracker.java:
{code}
+ Throwable exception
+ ) {
{code}
Please move the second line to the end of the first line.
For CompactSplitThread.java:
{code}
+import java.util.concurrent.*;
{code}
Please restore the individual imports from java.util.concurrent
{code}
while (this.server.getSchemaChangeTracker()
.isSchemaChangeInProgress(tableName)) {
try {
- Thread.sleep(100);
+ Thread.sleep(500);
{code}
Why is the sleep interval longer ?
{code}
+ <name>hbase.instant.schema.throttle.time</name>
+ <value>500</value>
+ <description>Throttle time in millis while closing/re opening impacted
regions
{code}
're opening' -> 're-opening'
Since user may choose longer throttle interval,
'hbase.instant.schema.alter.timeout' should made longer.
> Introduce throttling during Instant schema change process to throttle
> opening/closing regions.
> -----------------------------------------------------------------------------------------------
>
> Key: HBASE-5713
> URL: https://issues.apache.org/jira/browse/HBASE-5713
> Project: HBase
> Issue Type: Bug
> Components: client, master, regionserver, shell
> Reporter: Subbu M Iyer
> Assignee: Subbu M Iyer
> Priority: Minor
> Attachments: 5713.txt
>
>
> There is a potential for region open/close stampede during instant schema
> change process as the process attempts to close/open impacted regions in
> rapid succession. We need to introduce some kind of throttling to eliminate
> the race condition.
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