[
https://issues.apache.org/jira/browse/HBASE-7445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Zhong Deyin resolved HBASE-7445.
Resolution: Fixed
modify class org.apache.hadoop.hbase.master.handler.ServerShutdownHandler,
change the process method, replace code
this.services.getAssignmentManager().assignMeta() to
assignMetaWithRetries(),then meta will try 10 times while the regionservers
crashed.
{code}
// Carrying meta
if (isCarryingMeta()) {
LOG.info("Server " + serverName +
" was carrying META. Trying to assign.");
this.services.getAssignmentManager().
regionOffline(HRegionInfo.FIRST_META_REGIONINFO);
//this.services.getAssignmentManager().assignMeta();
assignMetaWithRetries();
}
{code}
Add method assignMetaWithRetries, code of assignMetaWithRetries method as
follows:
{code}
private void assignMetaWithRetries() throws IOException{
int iTimes = this.server.getConfiguration().getInt(
"hbase.catalog.verification.retries", 10);
long waitTime = this.server.getConfiguration().getLong(
"hbase.catalog.verification.timeout", 1000);
int iFlag = 0;
LOG.info("TEST START");
while (true) {
try {
// verifyAndAssignRoot();
this.services.getAssignmentManager().assignMeta();
break;
} catch (Exception e) {
if (iFlag >= iTimes) {
this.server.abort(" test ming assginMeta failed
after" + iTimes
+ " times retries, aborting", e);
throw new IOException("Aborting", e);
}
try {
Thread.sleep(waitTime);
} catch (InterruptedException e1) {
LOG.warn("Interrupted when is the thread sleep", e1);
Thread.currentThread().interrupt();
throw new IOException("Interrupted", e1);
}
iFlag++;
}
}
LOG.info("TEST END HBASE");
}
{code}
> Hbase cluster is unavailable while the regionserver that Meta table deployed
> crashed
>
>
> Key: HBASE-7445
> URL: https://issues.apache.org/jira/browse/HBASE-7445
> Project: HBase
> Issue Type: Bug
> Components: Region Assignment, regionserver
>Affects Versions: 0.94.1
> Environment: Hadoop 0.20.2-cdh3u3
> Hbase 0.94.1
>Reporter: Zhong Deyin
> Labels: patch
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> while the regionserver that META table deployed crashed, the .META. table
> can't migrate to other available regionservers. Then the region spliting,
> can't find META table, cause the whole cluster is unavailable.
> Code path: org.apache.hadoop.hbase.master.handler.ServerShutdownHandler
> {code}
> // Carrying meta
> if (isCarryingMeta()) {
> LOG.info("Server " + serverName + " was carrying META. Trying to
> assign.");
> this.services.getAssignmentManager().
> regionOffline(HRegionInfo.FIRST_META_REGIONINFO);
> this.services.getAssignmentManager().assignMeta();
> }
> {code}
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