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HBASE-510 HConnectionManger.listTables returns empty list if exception (though there may be many tables present) 

-Added retry logic to listTables

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@636983 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Bryan Duxbury 2008-03-14 03:44:06 +00:00
parent 4ea64897fe
commit 97d4b9fd3c
1 changed files with 37 additions and 33 deletions
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70
src/java/org/apache/hadoop/hbase/client/HConnectionManager.java
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@ -256,47 +256,51 @@ public class HConnectionManager implements HConstants {
// scan over the each meta region
do {
try{
// turn the start row into a location
metaLocation = locateRegion(META_TABLE_NAME, startRow);
for (int triesSoFar = 0; triesSoFar < numRetries; triesSoFar++) {
try{
// turn the start row into a location
metaLocation = locateRegion(META_TABLE_NAME, startRow);
// connect to the server hosting the .META. region
server = getHRegionConnection(metaLocation.getServerAddress());
// connect to the server hosting the .META. region
server = getHRegionConnection(metaLocation.getServerAddress());
// open a scanner over the meta region
scannerId = server.openScanner(
metaLocation.getRegionInfo().getRegionName(),
new Text[]{COL_REGIONINFO}, startRow, LATEST_TIMESTAMP, null);
// open a scanner over the meta region
scannerId = server.openScanner(
metaLocation.getRegionInfo().getRegionName(),
new Text[]{COL_REGIONINFO}, startRow, LATEST_TIMESTAMP, null);
// iterate through the scanner, accumulating unique table names
while (true) {
RowResult values = server.next(scannerId);
if (values == null || values.size() == 0) {
break;
}
// iterate through the scanner, accumulating unique table names
while (true) {
RowResult values = server.next(scannerId);
if (values == null || values.size() == 0) {
break;
}
HRegionInfo info =
Writables.getHRegionInfo(values.get(COL_REGIONINFO));
HRegionInfo info =
Writables.getHRegionInfo(values.get(COL_REGIONINFO));
// Only examine the rows where the startKey is zero length
if (info.getStartKey().getLength() == 0) {
uniqueTables.add(info.getTableDesc());
// Only examine the rows where the startKey is zero length
if (info.getStartKey().getLength() == 0) {
uniqueTables.add(info.getTableDesc());
}
}
}
server.close(scannerId);
scannerId = -1L;
// advance the startRow to the end key of the current region
startRow = metaLocation.getRegionInfo().getEndKey();
} catch (IOException e) {
// Retry once.
metaLocation = relocateRegion(META_TABLE_NAME, startRow);
continue;
}
finally {
if (scannerId != -1L && server != null) {
server.close(scannerId);
scannerId = -1L;
// advance the startRow to the end key of the current region
startRow = metaLocation.getRegionInfo().getEndKey();
// break out of retry loop
break;
} catch (IOException e) {
// Retry once.
metaLocation = relocateRegion(META_TABLE_NAME, startRow);
continue;
}
finally {
if (scannerId != -1L && server != null) {
server.close(scannerId);
}
}
}
} while (startRow.compareTo(LAST_ROW) != 0);