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Handles processing region merges. Put in a queue, owned by HRegionServer.
LOG.debug("Skipping merge because server is stopping="
"Skip rollback/cleanup of failed merge of " + region_a + " and "
LOG.warn("Running rollback/cleanup of failed merge of "
LOG.info("Successful rollback of failed merge of "
this.server.abort("Abort; we got an error after point-of-no-return"
String msg = "Failed rollback of failed merge of "
LOG.info("Regions merged, hbase:meta updated, and report to master. region_a="
LOG.error("Could not release the table lock (something is really wrong). "
+ "Aborting this server to avoid holding the lock forever.");
this.server.abort("Abort; we got an error when releasing the table lock "