Source:
<code>public Subprocedure buildSubprocedure(SnapshotDescription snapshot) { if (rss.isStopping() || rss.isStopped()) { throw new IllegalStateException("Can't start snapshot on RS: " + rss.getServerName() + ", because stopping/stopped!"); } List<HRegion> involvedRegions; try { involvedRegions = getRegionsToSnapshot(snapshot); } catch (IOException e1) { throw new IllegalStateException("Failed to figure out if we should handle a snapshot - " + "something has gone awry with the online regions.", e1); } <START> if (involvedRegions == null && involvedRegions.isEmpty()) { <END> LOG.info("no region of is online on the {}.", snapshot.getTable(), this.rss.getServerName()); return null; } LOG.debug("Launching subprocedure for snapshot " + snapshot.getName() + " from table " + snapshot.getTable() + " type " + snapshot.getType()); ForeignExceptionDispatcher exnDispatcher = new ForeignExceptionDispatcher(snapshot.getName()); Configuration conf = rss.getConfiguration(); long timeoutMillis = conf.getLong(SNAPSHOT_TIMEOUT_MILLIS_KEY, SNAPSHOT_TIMEOUT_MILLIS_DEFAULT); long wakeMillis = conf.getLong(SNAPSHOT_REQUEST_WAKE_MILLIS_KEY, SNAPSHOT_REQUEST_WAKE_MILLIS_DEFAULT); switch (snapshot.getType()) { case FLUSH: SnapshotSubprocedurePool taskManager = new SnapshotSubprocedurePool(rss.getServerName().toString(), conf, rss); return new FlushSnapshotSubprocedure(member, exnDispatcher, wakeMillis, timeoutMillis, involvedRegions, snapshot, taskManager); case SKIPFLUSH: SnapshotSubprocedurePool taskManager2 = new SnapshotSubprocedurePool(rss.getServerName().toString(), conf, rss); return new FlushSnapshotSubprocedure(member, exnDispatcher, wakeMillis, timeoutMillis, involvedRegions, snapshot, taskManager2); default: throw new UnsupportedOperationException("Unrecognized snapshot type:" + snapshot.getType()); } }</code><technical_language>here, && used</technical_language>

Target:
public Subprocedure buildSubprocedure(SnapshotDescription snapshot) { if (rss.isStopping() || rss.isStopped()) { throw new IllegalStateException("Can't start snapshot on RS: " + rss.getServerName() + ", because stopping/stopped!"); } List<HRegion> involvedRegions; try { involvedRegions = getRegionsToSnapshot(snapshot); } catch (IOException e1) { throw new IllegalStateException("Failed to figure out if we should handle a snapshot - " + "something has gone awry with the online regions.", e1); } if (CollectionUtils.isEmpty(involvedRegions)) { LOG.info("no region of is online on the {}.", snapshot.getTable(), this.rss.getServerName()); return null; } LOG.debug("Launching subprocedure for snapshot " + snapshot.getName() + " from table " + snapshot.getTable() + " type " + snapshot.getType()); ForeignExceptionDispatcher exnDispatcher = new ForeignExceptionDispatcher(snapshot.getName()); Configuration conf = rss.getConfiguration(); long timeoutMillis = conf.getLong(SNAPSHOT_TIMEOUT_MILLIS_KEY, SNAPSHOT_TIMEOUT_MILLIS_DEFAULT); long wakeMillis = conf.getLong(SNAPSHOT_REQUEST_WAKE_MILLIS_KEY, SNAPSHOT_REQUEST_WAKE_MILLIS_DEFAULT); switch (snapshot.getType()) { case FLUSH: SnapshotSubprocedurePool taskManager = new SnapshotSubprocedurePool(rss.getServerName().toString(), conf, rss); return new FlushSnapshotSubprocedure(member, exnDispatcher, wakeMillis, timeoutMillis, involvedRegions, snapshot, taskManager); case SKIPFLUSH: SnapshotSubprocedurePool taskManager2 = new SnapshotSubprocedurePool(rss.getServerName().toString(), conf, rss); return new FlushSnapshotSubprocedure(member, exnDispatcher, wakeMillis, timeoutMillis, involvedRegions, snapshot, taskManager2); default: throw new UnsupportedOperationException("Unrecognized snapshot type:" + snapshot.getType()); } }