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From "Enis Soztutar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12454) Setting didPerformCompaction early in HRegion#compact
Date Wed, 03 Dec 2014 00:04:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14232324#comment-14232324
] 

Enis Soztutar commented on HBASE-12454:
---------------------------------------

Found in triage. Seems good to commit. 

> Setting didPerformCompaction early in HRegion#compact
> -----------------------------------------------------
>
>                 Key: HBASE-12454
>                 URL: https://issues.apache.org/jira/browse/HBASE-12454
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.8
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Minor
>             Fix For: 1.0.0, 2.0.0, 0.98.9
>
>         Attachments: HBASE-12454-0.98.patch, HBASE-12454-v2.patch, HBASE-12454.patch,
HBASE-12454.patch, HBASE-12454.patch
>
>
> It appears we are setting 'didPerformCompaction' to "true" before attempting the compaction
in HRegion#compact. If Store#compact throws an exception or is interrupted, we won't call
Store#cancelRequestedCompaction in the last finally block of the method as it looks like we
should.
> {code}
> --- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
> +++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
> @@ -1540,58 +1540,58 @@ public class HRegion implements HeapSize, PropagatingConfigurationObserver
{
>          return false;
>        }
>  
>        status = TaskMonitor.get().createStatus("Compacting " + store + " in " + this);
>        if (this.closed.get()) {
>          String msg = "Skipping compaction on " + this + " because closed";
>          LOG.debug(msg);
>          status.abort(msg);
>          return false;
>        }
>        boolean wasStateSet = false;
>        try {
>          synchronized (writestate) {
>            if (writestate.writesEnabled) {
>              wasStateSet = true;
>              ++writestate.compacting;
>            } else {
>              String msg = "NOT compacting region " + this + ". Writes disabled.";
>              LOG.info(msg);
>              status.abort(msg);
>              return false;
>            }
>          }
>          LOG.info("Starting compaction on " + store + " in region " + this
>              + (compaction.getRequest().isOffPeak()?" as an off-peak compaction":""));
>          doRegionCompactionPrep();
>          try {
>            status.setStatus("Compacting store " + store);
> -          didPerformCompaction = true;
>            store.compact(compaction);
> +          didPerformCompaction = true;
>          } catch (InterruptedIOException iioe) {
>            String msg = "compaction interrupted";
>            LOG.info(msg, iioe);
>            status.abort(msg);
>            return false;
>          }
>        } finally {
>          if (wasStateSet) {
>            synchronized (writestate) {
>              --writestate.compacting;
>              if (writestate.compacting <= 0) {
>                writestate.notifyAll();
>              }
>            }
>          }
>        }
>        status.markComplete("Compaction complete");
>        return true;
>      } finally {
>        try {
>          if (!didPerformCompaction) store.cancelRequestedCompaction(compaction);   <-----
>          if (status != null) status.cleanup();
>        } finally {
>          lock.readLock().unlock();
>        }
>      }
>    }{code}



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