I am sorry for typo. For the second question I meant postWALWrite in WALObserver.
default void postWALWrite <https://hbase.apache.org/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/WALObserver.html#line.86> (ObserverContext <https://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/coprocessor/ObserverContext.html><? extends WALCoprocessorEnvironment <https://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/coprocessor/WALCoprocessorEnvironment.html>> ctx, HRegionInfo <https://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/HRegionInfo.html> info, WALKey <https://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/wal/WALKey.html> logKey, WALEdit <https://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/regionserver/wal/WALEdit.html> logEdit) throws IOException <http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true> Thanks On 23 Mar 2017 02:37, "Ted Yu" <yuzhih...@gmail.com> wrote: > Sreeram: > For #2, did you mean this method ? > > default void postWALRestore(final ObserverContext<? extends > RegionCoprocessorEnvironment> ctx, > > HRegionInfo info, WALKey logKey, WALEdit logEdit) throws IOException > {} > > On Wed, Mar 22, 2017 at 12:56 PM, Vladimir Rodionov < > vladrodio...@gmail.com> > wrote: > > > a) HBase does not support transaction - it only guarantees that single > > mutation to a row-key is atomic. WALEdit can contains cells (mutations) > > from different rows (for example when you do butchMutatate all operations > > go to the same WALEdit afaik) > > b) I coud not find postWALEdit() in RegionObserver API. What coprocessor > > hook did you mean exactly? > > > > -Vlad > > > > On Wed, Mar 22, 2017 at 5:19 AM, Sreeram <sreera...@gmail.com> wrote: > > > > > Hi, > > > > > > I have below questions on WALEdit. Looking forward to answer from the > > > community. > > > > > > a) I understand that all Cells in a given WALEdit form part of a > single > > > transaction. Since HBase atomicity is at row level, this implies all > > Cells > > > in a given WALEdit have the same row key. is this understanding is > > correct > > > > > > > > > > > > b) With MultiWAL, does log sequence monotonically increase based on > > > transaction time stamp ? Specifically, suppose there two transactions > > for > > > two different tables for a single region server at times t0 and t1 (t0 > < > > > t1). In the presence of MultiWAL, will the postWALEdit() coprocessor > > event > > > for transaction 0 be triggered before than transaction 1? > > > > > > > > > > > > Thanks, > > > > > > Sreeram > > > > > > PS: I use HBase version 1.2.0 > > > > > >
